Details of the Researcher

PHOTO

Masataka Nakazawa
Section
International Research Institute of Disaster Science
Job title
Specially Appointed Research Fellow
Degree

  • 工学博士（東京工業大学）

  • 工学修士（東京工業大学）

Committee Memberships 2

  • 電子情報通信学会　超高速光エレクトロニクス研究会委員長OFT委員会(1998-2001)、エレクトロニクスソサイエティ会長(2005)

    1978/04 - Present

  • 電子情報通信学会　超高速光エレクトロニクス研究会委員長OFT委員会(1998-2001)、エレクトロニクスソサイエティ会長(2005)

    1978/04 - Present

Professional Memberships 6

  • 日本光学会(OSJ)

  • レーザー学会

  • 応用物理学会

  • 電子情報通信学会

  • OSA

  • IEEE

︎Show all ︎Show first 5

Research Areas 2

  • Nanotechnology/Materials / Optical engineering and photonics / Nonlinear optics

  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Communication and network engineering / Ultrahigh-speed optical communication

Awards 56

  1. 第36回電気通信普及財団賞（テレコムシステム技術賞）

    2021/03

  2. 山梨県中央市 市民栄誉賞

    2021/02

  3. ICETC 2020 Best Paper Award

    2020/12

  4. 電子情報通信学会 ELEX Best Paper Award

    2020/09

  5. 第70回「電波の日」総務大臣表彰

    2020/06

  6. Opto-Electronics and Communication Conference (OECC) 2018 Best Paper Award

    2018/07

  7. 藤原科学財団 第56回藤原賞

    2015/06

  8. 第64回河北文化賞

    2015/01

  9. International Wire & Cable Symposium, Inc・Jack Spergel Memorial Award

    2014/11

  10. OSA Charles Hard Townes Award

    2014/06

  11. NEC C&C財団 2013年度C&C賞

    2013/11

  12. 微小光学国際会議 MOC Award

    2013/10

  13. 東北大学 総長特別賞

    2013/03

  14. 第103回(平成25年)日本学士院賞

    2013/03

  15. 第13回応用物理学会 業績賞

    2013/03

  16. 電子情報通信学会通信ソサイエティ功労顕彰状

    2012/09

  17. 平成23年度電子情報通信学会論文賞

    2012/05

  18. 財団法人光産業技術振興協会 創立30周年記念功労者表彰

    2010/12

  19. 第4回(2010年度)応用物理学会フェロー表彰

    2010/09

  20. IEEE Photonics Society Quantum Electronics Award

    2010/05

  21. 平成22年春の勲章 紫綬褒章

    2010/04

  22. 応用物理学会 第11回光・量子エレクトロニクス業績賞(宅間宏賞)

    2010/03

  23. 東北大学 総長特別賞

    2009/09

  24. 電子情報通信学会 2008年ELEX Best Paper Award

    2009/09

  25. 第8回 内閣府 産学連携功労者表彰 内閣総理大臣賞

    2009/06

  26. 電子情報通信学会 功労賞

    2009/05

  27. 総務省 志田林三郎賞

    2008/06

  28. Thomson Scientific Laureate

    2006/09　Thomson Scientific

  29. 東レ科学技術賞

    2006/03　東レ

  30. R. W. Wood Prize

    2005/05　Optical Society of America　For invention of the 1.48μm InGaAsP laser-diode-pumped erbium-doped fiber

  31. 第35回新技術開発財団 市村産業賞

    2003/04　新技術開発財団

  32. IEEE Daniel E. Noble Award

    2002/12　IEEE

  33. 第72回服部報公会 報公賞

    2002/10　服部報公会

  34. 第27回科学技術振興事業団 井上春成賞

    2002/07　科学技術振興事業団

  35. 電子情報通信学会 猪瀬賞

    2002/05　電子情報通信学会　位相変調器による3次、４次分散同時補償を用いた1.28Tbit/s-70kmフェムト秒パルスOTDM伝送

  36. 電子情報通信学会 論文賞

    2002/04　電子情報通信学会　位相変調器による3次、４次分散同時補償を用いた1.28Tbit/s-70kmフェムト秒パルスOTDM伝送

  37. 電子情報通信学会 フォロー

    2001/09　電子情報通信学会

  38. 電子情報通信学会 論文賞

    2000/05　電子情報通信学会

  39. NTT R&Dフェロー

    1999/04　NTT

  40. 電子情報通信学会 論文賞

    1998/05　電子情報通信学会

  41. 第13回電気通信普及財団 テレコムシステム技術賞

    1998/03　電気通信普及財団

  42. 科学技術庁長官賞(研究功績者賞)

    1997/04　科学技術庁

  43. 電子情報通信学会 業績賞

    1996/05　電子情報通信学会

  44. IEEE Fellow Award

    1995/01　IEEE

  45. Fifth OptoElectronics Conference(OEC'94)Best Paper Award

    1994/07　.

  46. 電子情報通信学会 業績賞

    1994/05　電子情報通信学会

  47. 電子情報通信学会 論文賞

    1994/05　電子情報通信学会

  48. レーザー学会 研究業績賞

    1993/05　レーザー学会

  49. 科学技術庁長官 注目発明表彰

    1993/04　科学技術庁

  50. OSA(Optical Society of America)Fellow Award

    1992/06　OSA

  51. 応用物理学会 会誌賞

    1991/10　応用物理学会

  52. IEE, Electronics Letters Premium Award, United Kingdom

    1990/10　IEE

  53. 第5回 桜井健二郎記念賞

    1989/11　.

  54. 応用物理学会 光学論文賞

    1985/03　応用物理学会

  55. 電子通信学会 学術奨励賞

    1983/04　電子通信学会

  56. 丹羽保次郎記念賞

    1980/03　.

Show all ︎Show 5

Papers 988

  1. Coherent Nyquist optical pulse transmission at nearly 1-Tb/s/λ over 1,600 km with a capacity of 21.5 Tb/s using PS-32 QAM signals

    Shohei Beppu, Aoto Ishikawa, Takeki Serikawa, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    Optics Express　32　(9)　16533-16533　2024/04/19

    Publisher: Optica Publishing Group

    DOI： 10.1364/oe.518396 　

    eISSN： 1094-4087

    More details Close

    We demonstrate the 1,600-km transmission at nearly 1-Tb/s/λ signals with a capacity of 21.5 Tb/s. Probabilistic shaping was newly applied to high-speed coherent optical Nyquist pulse transmission systems to maximize the transmission capacity. Employing a 160-GBd PS-32 QAM format, WDM signals at nearly 1-Tb/s/λ were successfully transmitted over 1,600 km with a capacity of 21.5 Tb/s.

  2. Eigen-function division multiplexed coherent optical transmission in time domain by using higher-order Hermite-Gaussian pulses

    Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka

    Optics Express　32　(7)　12682-12682　2024/03/21

    Publisher: Optica Publishing Group

    DOI： 10.1364/oe.510189 　

    eISSN： 1094-4087

    More details Close

    We describe a new multiplexing technique and its application to demultiplexing in the time domain by using higher-order Hermite-Gaussian (HG) pulses, which are solutions of the Schrödinger equation. We call this technique eigen-function division multiplexing (EDM). This method enables us to further increase the total transmission capacity by superimposing many different HG pulses in the same time slot. This technique is different from a conventional optical time domain multiplexing (OTDM) technique using interleaving, where one pulse exists only in one time slot. The transmitted EDM HG pulses can be demultiplexed by adopting the time-domain orthogonality of the HG pulses (eigen-function orthogonality). The information carried by the mth-order HG pulse (HGm pulse) can be coherently detected by a photo detector, where photo-mixing with a phase-locked HGm pulse generated by a local oscillator can realize demultiplexing. The overlap integral with a different HG pulse becomes zero due to the time domain orthogonality. First, we show numerically that such a new EDM transmission scheme in the time domain is possible. We then show experimentally that we could successfully carry out an EDM HG coherent pulse transmission with four different HG pulses (HG0, HG1, HG2, and HG3), where we report a 400∼480 Gbit/s (10 Gbaud x 4 eigen-functions x 2 pol-mux.) 32∼64 QAM EDM transmission over 300∼450 km.

  3. Experiments on the Generation of Higher-Order Hermite-Gaussian Pulses From an FM Mode-Locked Laser

    Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka

    IEEE Journal of Quantum Electronics　59　(6)　1-16　2023/12

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1109/jqe.2023.3305121 　

    ISSN： 0018-9197

    eISSN： 1558-1713

  4. Demodulation Performance Comparison of High-Speed Coherent Nyquist Pulse Signal with Analog and Digital Demultiplexing Schemes

    Masato YOSHIDA, Kosuke KIMURA, Toshihiko HIROOKA, Keisuke KASAI, Masataka NAKAZAWA

    IEICE Transactions on Communications　E106.B　(11)　1059-1064　2023/11/01

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1587/transcom.2022obp0001 　

    ISSN： 0916-8516

    eISSN： 1745-1345

  5. GAWBS Noise in Digital Coherent Transmission

    Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka

    Journal of Lightwave Technology　41　(11)　3358-3371　2023/06/01

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1109/jlt.2023.3255942 　

    ISSN： 0733-8724

    eISSN： 1558-2213

  6. Experiments on Generation of Various Dark and Bright Pulses From an FM Mode-Locked Laser

    Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka

    IEEE Journal of Quantum Electronics　58　(6)　1-23　2022/12

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1109/jqe.2022.3210339 　

    ISSN： 0018-9197

    eISSN： 1558-1713

  7. Experimental and Numerical Analysis of Ultrahigh-Speed Coherent Nyquist Pulse Transmission with Low-Nonlinearity Dispersion Compensator

    Kosuke KIMURA, Masato YOSHIDA, Keisuke KASAI, Toshihiko HIROOKA, Masataka NAKAZAWA

    IEICE Transactions on Communications　E105.B　(9)　1014-1022　2022/09/01

    Publisher: Institute of Electronics, Information and Communications Engineers (IEICE)

    DOI： 10.1587/transcom.2021ebp3178 　

    ISSN： 0916-8516

    eISSN： 1745-1345

  8. Characterization of Inter-core Crosstalk of Multi-core Fiber as a Function of Bending Radius with Multi-channel OTDR

    Yuto Kobayashi, Takahiro Suganuma, Tetsuya Hayashi, Takemi Hasegawa, Masato Yoshida, Masataka Nakazawa

    2022 27th OptoElectronics and Communications Conference (OECC) and 2022 International Conference on Photonics in Switching and Computing (PSC)　2022/07/03

    Publisher: IEEE

    DOI： 10.23919/oecc/psc53152.2022.9850127 　

  9. Demodulation Performance Comparison of 160 Gbaud Coherent Nyquist Pulse Signal with Analog and Digital DEMUX Schemes

    Masato Yoshida, Kosuke Kimura, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    2022 27th OptoElectronics and Communications Conference (OECC) and 2022 International Conference on Photonics in Switching and Computing (PSC)　2022/07/03

    Publisher: IEEE

    DOI： 10.23919/oecc/psc53152.2022.9849876 　

  10. 10.2 Tbit/s (1.28 Tbit/s/ch x 8 ch) WDM Nyquist Pulse Transmission over 2100 km

    Aoi Watanabe, Aoto Ishikawa, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    2022 27th OptoElectronics and Communications Conference (OECC) and 2022 International Conference on Photonics in Switching and Computing (PSC)　2022/07/03

    Publisher: IEEE

    DOI： 10.23919/oecc/psc53152.2022.9849931 　

  11. GAWBS noise in multicore fibers

    Masato Yoshida, Masataka Nakazawa

    2022 27th OptoElectronics and Communications Conference (OECC) and 2022 International Conference on Photonics in Switching and Computing (PSC)　2022/07/03

    Publisher: IEEE

    DOI： 10.23919/oecc/psc53152.2022.9849900 　

  12. Software-Defined Fiber Optic Communications for Ultrahigh-Speed Optical Pulse Transmission Systems

    Mahdi Naghshvarianjahromi, Shiva Kumar, M. Jamal Deen, Taro Iwaya, Kosuke Kimura, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    IEEE Journal of Selected Topics in Quantum Electronics　28　(4)　1-10　2022/07

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1109/jstqe.2022.3190885 　

    ISSN： 1077-260X

    eISSN： 1558-4542

  13. Experiments on an AM Mode-Locked Laser as an Arbitrary Optical Function Generator

    Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka

    IEEE JOURNAL OF QUANTUM ELECTRONICS　58　(3)　2022/06

    DOI： 10.1109/JQE.2022.3165322 　

    ISSN： 0018-9197

    eISSN： 1558-1713

  14. Experiments on an FM Mode-Locked Laser as an Arbitrary Optical Function Generator

    Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka

    IEEE JOURNAL OF QUANTUM ELECTRONICS　58　(3)　2022/06

    DOI： 10.1109/JQE.2022.3165317 　

    ISSN： 0018-9197

    eISSN： 1558-1713

  15. Broadband injection-locked homodyne receiver for digital coherent transmission using a low Q Fabry-Perot LD

    Keisuke Kasai, Takashi Kan, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    OPTICS EXPRESS　30　(8)　13345-13355　2022/04

    DOI： 10.1364/OE.456327 　

    ISSN： 1094-4087

  16. Precise Measurements and their Analysis of GAWBS-Induced Depolarization Noise in Multi-Core Fiber for Digital Coherent Transmission

    Masato Yoshida, Kozo Sato, Toshihiko Hirooka, Keisuke Kasai, Masataka Nakazawa

    IEICE TRANSACTIONS ON COMMUNICATIONS　E105B　(2)　151-158　2022/02

    DOI： 10.1587/transcom.2021CEP0006 　

    ISSN： 0916-8516

    eISSN： 1745-1345

  17. Measurement of Mode-Coupling Along a Multi-Core Submarine Fiber Cable with a Multi-Channel OTDR

    Masato Yoshida, Toshihiko Hirooka, Nakazawa Masataka, Tetsuya Hayashi, Takemi Hasegawa, Kohei Nakamura, Takanori Inoue

    2022 European Conference on Optical Communication, ECOC 2022　2022

  18. Distributed Measurement of Rayleigh Backscattered Crosstalk for Bidirectional Multicore Fiber Transmissions Using Multi-Channel Optical Time Domain Reflectometry

    Yuto Kobayashi, Tetsuya Hayashi, Takemi Hasegawa, Takahiro Suganuma, Inoue Ayumi, Takuji Nagashima, Hirotaka Sakuma, Takahiro Kikuchi, Osamu Shimakawa, Hidehisa Tazawa, Masato Yoshida, Masataka Nakazawa

    2022 European Conference on Optical Communication, ECOC 2022　2022

  19. Theory of AM Mode-Locking of a Laser as an Arbitrary Optical Function Generator

    Masataka Nakazawa, Toshihiko Hirooka

    IEEE Journal of Quantum Electronics　57　(6)　2021/12/01

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI： 10.1109/JQE.2021.3114173 　

    ISSN： 1558-1713 0018-9197

  20. GAWBS noise correlation between cores in multi-core fibers

    Kozo Sato, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    OPTICS EXPRESS　29　(26)　42523-42537　2021/12

    DOI： 10.1364/OE.442261 　

    ISSN： 1094-4087

  21. A generalized mode-locking theory for a Nyquist laser with an arbitrary roll-off factor Part I: Master equations and optical filters in a Nyquist laser

    Masataka Nakazawa, Toshihiko Hirooka

    IEEE Journal of Quantum Electronics　57　(3)　2021/06/01

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI： 10.1109/JQE.2021.3065960 　

    ISSN： 1558-1713 0018-9197

  22. A Generalized Mode-Locking Theory for a Nyquist Laser with an Arbitrary Roll-Off Factor PART II: Oscillation Waveforms and Spectral Characteristics

    Masataka Nakazawa, Toshihiko Hirooka

    IEEE Journal of Quantum Electronics　57　(3)　2021/06/01

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI： 10.1109/JQE.2021.3065935 　

    ISSN： 1558-1713 0018-9197

  23. 10 Channel WDM 80 Gbit/s/ch, 256 QAM Bi-Directional Coherent Transmission for a High Capacity Next-Generation Mobile Fronthaul

    Masato Yoshida, Takashi Kan, Keisuke Kasai, Toshihiko Hirooka, Katsumi Iwatsuki, Masataka Nakazawa

    JOURNAL OF LIGHTWAVE TECHNOLOGY　39　(5)　1289-1295　2021/03

    DOI： 10.1109/JLT.2020.3034417 　

    ISSN： 0733-8724

    eISSN： 1558-2213

  24. Ultrahigh-Speed Nyquist Pulse Transmission Beyond 10 Tbit/s

    Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS　27　(2)　2021/03

    DOI： 10.1109/JSTQE.2020.3011939 　

    ISSN： 1077-260X

    eISSN： 1558-4542

  25. Chromatic dispersion dependence of GAWBS phase noise compensation with pilot tone

    Kozo Sato, Takashi Kan, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    OPTICS EXPRESS　29　(7)　10676-10687　2021/03

    DOI： 10.1364/OE.418891 　

    ISSN： 1094-4087

  26. 10 Tbit/s QAM Quantum Noise Stream Cipher Coherent Transmission over 160 Km

    Masato Yoshida, Takashi Kan, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    Journal of Lightwave Technology　39　(4)　1056-1063　2021/02/15

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI： 10.1109/JLT.2020.3016693 　

    ISSN： 1558-2213 0733-8724

  27. Experimental demonstration of distortion mitigation in 15 Tbit/s OTDM transmission using a cognitive dynamic system

    Mahdi Naghshvarianjahromi, Shiva Kumar, Jamal Deen, Taro Iwaya, Kosuke Kimura, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    26th Optoelectronics and Communications Conference　2021

    Publisher: OSA

    DOI： 10.1364/oecc.2021.t4b.8 　

  28. Single-Channel 1.28 Tbit/s Optical Nyquist Pulse Transmission over 3000 km with Roll-off Factor Optimization

    Aoi Watanabe, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    26th Optoelectronics and Communications Conference　2021

    Publisher: OSA

    DOI： 10.1364/oecc.2021.t4b.6 　

  29. Broadband Dynamic Injection-Locking Performance of Fabry-Perot LD and Its Application to Coherent Homodyne Receiver

    Takashi Kan, Keisuke Kasai, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    2021 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC)　2021

  30. 64 Gbit/s, 256 QAM Transmission Through Coherent Optical-Wireless Link at 61 GHz Using Simple and High OSNR Carrier Frequency Converter

    Keisuke Kasai, Taisei Sato, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa

    2021 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC)　2021

  31. GAWBS Noise Correlation Between Cores in Four-Core Fiber

    Kozo Sato, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    2021 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC)　2021

  32. Spectrally efficient pilot tone-based compensation of inter-channel cross-phase modulation noise in a WDM coherent transmission using injection locking

    Takashi Kan, Kozo Sato, Masato Yoshida, Toshihiko Hirooka, Keisuke Kasai, Masataka Nakazawa

    OPTICS EXPRESS　29　(2)　1454-1469　2021/01

    DOI： 10.1364/OE.414381 　

    ISSN： 1094-4087

  33. Study on chromatic dispersion dependence of GAWBS noise

    佐藤耕造, 管貴志, 吉田真人, 葛西恵介, 廣岡俊彦, 中沢正隆

    電子情報通信学会技術研究報告(Web)　120　(309(OCS2020 27-39))　2021

    ISSN： 2432-6380

  34. 12.8 Tbit/s (1.28 Tbit/s/ch x 10) OTDM-WDM Transmission of PDM-DQPSK Optical Nyquist Pulses over 1500 km

    渡邊碧, 吉田真人, 廣岡俊彦, 中沢正隆

    電子情報通信学会技術研究報告(Web)　120　(309(OCS2020 27-39))　2021

    ISSN： 2432-6380

  35. Toward optical and wireless convergence with coherently-linked access network

    廣岡俊彦, 葛西恵介, 吉田真人, 中沢正隆

    電子情報通信学会技術研究報告(Web)　120　(341(SR2020 47-59))　2021

    ISSN： 2432-6380

  36. Study on Chromatic Dispersion Dependence of GAWBS Noise

    佐藤耕造, 管貴志, 吉田真人, 葛西恵介, 廣岡俊彦, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2021　2021

    ISSN： 1349-144X

  37. 12.8 Tbit/s (1.28 Tbit/s/ch x 10) OTDM-WDM Transmission of PDM-DQPSK Optical Nyquist Pulses over 1500 km

    渡邊碧, 吉田真人, 廣岡俊彦, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2021　2021

    ISSN： 1349-144X

  38. Coherently-linked optical and wireless access system for next generation RAN

    中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2021　2021

    ISSN： 1349-144X

  39. BER performance improvement of ultrahigh-speed coherent Nyquist pulse transmission using low-nonlinearity, dispersion-compensated transmission line with chirped FBG and LCoS

    木村光佑, 木村光佑, 吉田真人, 葛西恵介, 廣岡俊彦, 中沢正隆

    電子情報通信学会技術研究報告(Web)　121　(18(OFT2021 1-11))　2021

    ISSN： 2432-6380

  40. Precise and Wideband Compensation of WDM Inter-Channel Cross-Phase Modulation Noise Using Injection Locking

    管貴志, 佐藤耕造, 吉田真人, 葛西恵介, 廣岡俊彦, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2021　2021

    ISSN： 1349-144X

  41. Low-Nonlinearity, Dispersion-Compensated Transmission Line with a Chirped Fiber Bragg Grating and LCoS and Its Application to Ultrahigh-Speed Coherent Nyquist Pulse Transmission

    岩屋太郎, 木村光佑, 吉田真人, 葛西恵介, 廣岡俊彦, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2021　2021

    ISSN： 1349-144X

  42. Injection-locked 256 QAM WDM coherent transmissions in the C- and L-bands

    Takashi Kan, Keisuke Kasai, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    OPTICS EXPRESS　28　(23)　34665-34676　2020/11

    DOI： 10.1364/OE.404786 　

    ISSN： 1094-4087

  43. Precise measurements and their analysis of GAWBS-induced depolarization noise in various optical fibers for digital coherent transmission

    Masato Yoshida, Naoya Takefushi, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    OPTICS EXPRESS　28　(23)　34422-34433　2020/11

    DOI： 10.1364/OE.409326 　

    ISSN： 1094-4087

  44. Digital Coherent Optical Access Technologies for beyond 5G Network

    Keisuke Kasai, Masataka Nakazawa, Masato Yoshida, Katsumi Iwatsuki, Toshihiko Hirooka

    2020 IEEE International Symposium on Radio-Frequency Integration Technology, RFIT 2020　145-147　2020/09/01

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI： 10.1109/RFIT49453.2020.9226206 　

  45. GAWBS phase noise characteristics in multi-core fibers for digital coherent transmission

    Naoya Takefushi, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    OPTICS EXPRESS　28　(15)　23012-23022　2020/07

    DOI： 10.1364/OE.399202 　

    ISSN： 1094-4087

  46. Evaluation of Systematic Errors in the Compact Absolute Gravimeter TAG-1 for Network Monitoring of Volcanic Activities

    Akito Araya, Keisuke Kasai, Masato Yoshida, Masataka Nakazawa, Tsuneya Tsubokawa

    International Association of Geodesy Symposia　2020/04/29

    Publisher: Springer Berlin Heidelberg

    DOI： 10.1007/1345_2020_107 　

    ISSN： 0939-9585

    eISSN： 2197-9359

    More details Close

    Abstract Volcanic activities sometimes involve gravity changes, and this research is intended to establish an observation network surrounding an active volcano using compact absolute gravimeters. To simplify the configuration of absolute gravimeters, they are preferably operated with a light source distributed from a telecom band (wavelength of 1.5 μm) laser through optical fibers. To evaluate the accuracy of the absolute gravimeter with the telecom band laser, we conducted observations using a prototype gravimeter (TAG-1) with frequency-stabilized lasers at both 1.5 μm and 633 nm, and compared these results with the expected gravity at the site. Initially, both results showed offsets −187 μGal and −9.6 μGal for the 1.5-μm laser and the 633-nm laser, respectively (1 Gal = 10−8 m/s2). By correcting the systematic errors of the photo detectors measured by the synthetic chirp signal, the obtained absolute gravity was consistent with the expected value for both wavelengths; offsets from the expected gravity were reduced to 6.6 μGal and 5.4 μGal for 1.5 μm and 633 nm, respectively. We also evaluated the errors associated with long-distance transmission of the 1.5-μm laser using a reeled optical fiber (26 km) and an optical amplifier and found no degradation in the gravity data from the case of short transmission (10 m). These results allow networking of compact absolute gravimeters connected by telecom optical fibers that are operated using a common laser and expansion to volcanic areas to monitor the gravity change associated with volcanic activities.

  47. Theoretical and experimental analyses of GAWBS phase noise in various optical fibers for digital coherent transmission

    Naoya Takefushi, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    OPTICS EXPRESS　28　(3)　2873-2883　2020/02

    DOI： 10.1364/OE.384505 　

    ISSN： 1094-4087

  48. Low-Nonlinearity, Dispersion-Compensated Transmission Line with a Chirped Fiber Bragg Grating and Its Application to Ultrahigh-Speed Coherent Nyquist Pulse Transmission

    Taro Iwaya, Kosuke Kimura, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    2020 OPTO-ELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC 2020)　2020

    ISSN： 2166-8884

    eISSN： 2166-8892

  49. Precise and Wideband Compensation of Inter-Channel Cross-Phase Modulation Noise in WDM Coherent Transmission Using Injection Locking

    Takashi Kan, Kozo Sato, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    2020 OPTO-ELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC 2020)　2020

    ISSN： 2166-8884

    eISSN： 2166-8892

  50. Chromatic Dispersion Dependence of GAWBS Noise

    Kozo Sato, Takashi Kan, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    2020 OPTO-ELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC 2020)　2020

    ISSN： 2166-8884

    eISSN： 2166-8892

  51. Research Project to Realize Various High-reliability Communications in Advanced 5G Network.

    Takahide Murakami, Yoji Kishi, Koji Ishibashi, Keisuke Kasai, Hiroyuki Shinbo, Morihiko Tamai, Kensuke Tsuda, Masataka Nakazawa, Yu Tsukamoto, Hiroyuki Yokoyama, Yoshimi Fujii, Yuta Seki, Shinobu Nanba, Takanori Hara, Fumiyuki Adachi, Takayuki Sotoyama

    2020 IEEE Wireless Communications and Networking Conference(WCNC)　1-8　2020

    Publisher: IEEE

    DOI： 10.1109/WCNC45663.2020.9120477 　

  52. 64 Gbit/s, 256 QAM Coherently-Linked Optical and Wireless Transmission in 61 GHz Band Using Novel Injection-Locked Carrier Frequency Converter.

    Keisuke Kasai, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa

    European Conference on Optical Communications(ECOC)　1-3　2020

    Publisher: IEEE

    DOI： 10.1109/ECOC48923.2020.9333340 　

  53. Next Generation C-RAN Mobile Fronthaul Using On-line Bi-directional 256 QAM WDM Coherent Transmission

    管貴志, 吉田真人, 葛西恵介, 廣岡俊彦, 岩月勝美, 中沢正隆

    電子情報通信学会技術研究報告　119　(366(OCS2019 65-77)(Web))　2020

    ISSN： 0913-5685

  54. R&D of Technology for High Reliability Management of Advanced 5G Network to Various Requirements of Communication Services

    村上隆秀, 新保宏之, 塚本優, 難波忍, 岸洋司, 玉井森彦, 横山浩之, 原郁紀, 石橋功至, 津田顕祐, 藤井義巳, 安達文幸, 葛西惠介, 中沢正隆, 関裕太, 外山隆行

    電子情報通信学会技術研究報告　119　(448(RCS2019 320-408)(Web))　2020

    ISSN： 0913-5685

  55. 10 GHz, 6.2 ps Transform-Limited Coherent Optical Pulse Generation from a 1.55 μm, Self-Injection Gain-Switched DFB-LD.

    Keisuke Kasai, Masataka Nakazawa

    電子情報通信学会大会講演論文集(CD-ROM)　2020　1-3　2020

    Publisher: IEEE

    ISSN： 1349-144X

  56. Effect of GAWBS Depolarization Noise on Digital Coherent Optical Transmission

    竹節直也, 吉田真人, 葛西恵介, 廣岡俊彦, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2020　2020

    ISSN： 1349-144X

  57. A proposal on optical-wireless mobile fronthaul for advanced 5G

    中沢正隆, 葛西恵介, 吉田真人, 廣岡俊彦, 岩月勝美

    電子情報通信学会大会講演論文集(CD-ROM)　2020　2020

    ISSN： 1349-144X

  58. Single-channel 15.3 Tbit/s, 64 QAM coherent Nyquist pulse transmission over 150 km

    木村光佑, 吉田真人, 岩屋太郎, 葛西恵介, 廣岡俊彦, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2020　2020

    ISSN： 1349-144X

  59. 10 Tbit/s QAM Quantum Noise Stream Cipher Coherent Transmission over 160 km.

    Masato Yoshida, Takashi Kan, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    電子情報通信学会大会講演論文集(CD-ROM)　2020　1-3　2020

    Publisher: IEEE

    ISSN： 1349-144X

  60. R&D of technology for high reliability management of advanced 5G network to various requirements of communication services

    新保宏之, 岸洋司, 横山浩之, 石橋功至, 藤井義巳, 中沢正隆, 外山隆之

    電子情報通信学会大会講演論文集(CD-ROM)　2020　2020

    ISSN： 1349-144X

  61. Experimental and Theoretical Analyses of GAWBS Phase Noise in Multi-Core Fiber for Digital Coherent Transmission.

    Naoya Takefushi, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    電子情報通信学会技術研究報告(Web)　120　(140(OCS2020 4-7))　1-3　2020

    Publisher: IEEE

    ISSN： 2432-6380

  62. Optical-wireless fully integrated coherent access system toward 6G

    中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2020　2020

    ISSN： 1349-144X

  63. R&D of technology for high reliability management of advanced 5G network to various requirements of communication services

    新保宏之, 岸洋司, 横山浩之, 石橋功至, 藤井義巳, 中沢正隆, 外山隆之

    電子情報通信学会大会講演論文集(CD-ROM)　2020　2020

    ISSN： 1349-144X

  64. 160 Gbit/s, 256 QAM bidirectional coherent transmission for mobile fronthaul without backward Rayleigh scattering interference

    葛西恵介, 吉田真人, 廣岡俊彦, 岩月勝美, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2020　2020

    ISSN： 1349-144X

  65. Experimental and theoretical analyses of GAWBS noise in multi-core fiber

    吉田真人, 竹節直也, 葛西恵介, 廣岡俊彦, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2020　2020

    ISSN： 1349-144X

  66. Suppression of large error floor in 1024 QAM digital coherent transmission by compensating for GAWBS phase noise

    Masato Yoshida, Naoya Takefushi, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    OPTICS EXPRESS　27　(25)　36691-36698　2019/12

    DOI： 10.1364/OE.27.036691 　

    ISSN： 1094-4087

  67. Single-channel 15.3 Tbit/s, 64 QAM coherent Nyquist pulse transmission over 150 km with a spectral efficiency of 8.3 bit/s/Hz

    Masato Yoshida, Kosuke Kimura, Taro Iwaya, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    OPTICS EXPRESS　27　(20)　28952-28967　2019/09

    DOI： 10.1364/OE.27.028952 　

    ISSN： 1094-4087

  68. 5G R&d activities for high capacity technologies with ultra high-density multi-band and multi-access layered cells

    Morihiko Minowa, Hiroyuki Seki, Yukihiko Okumura, Satoshi Suyama, Jun Terada, Satoshi Shigematsu, Yasushi Takatori, Hiroaki Asano, Yukio Hirano, Yasushi Yamao, Fumiyuki Adachi, Masataka Nakazawa

    IEEE Vehicular Technology Conference　2019-　2019/04/01

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI： 10.1109/VTCSpring.2019.8746622 　

    ISSN： 1550-2252

  69. Experimental and theoretical analyses of GaWBS depolarization noise in digital coherent transmission

    Naoya Takefushi, Masato Yoshida, Toshihiko Hirooka, Keisuke Kasai, Masataka Nakazawa

    IET Conference Publications　2019　(765)　2019

    Publisher: Institution of Engineering and Technology

  70. Demonstration of on-line bi-directional 10-rrhs with an 80 Gbit/s/rrh capacity using 256 QAM WDM coherent transmission for next generation mobile fronthaul

    Takashi Kan, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Katsumi Iwatsuki, Masataka Nakazawa

    IET Conference Publications　2019　(765)　2019

    Publisher: Institution of Engineering and Technology

  71. Sub-Picosecond Optical Switch over Entire C-Band by Using Nonlinear Optical Loop Mirror.

    Ryoya Hirata, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa

    2019 24th OptoElectronics and Communications Conference (OECC) and 2019 International Conference on Photonics in Switching and Computing (PSC)(OECC/PSC)　1-3　2019

    Publisher: IEEE

    DOI： 10.23919/PS.2019.8817821 　

  72. Dual-Polarization On-Line 256 and 512 QAM Digital Coherent Transmission.

    Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    Optical Fiber Communications Conference and Exhibition(OFC)　1-3　2019

    Publisher: IEEE

  73. The EDFA Odyssey-From Optical Soliton to Coherent Nyquist Pulse Transmission-

    中沢正隆

    東北大学電通談話会記録　87　(2)　2019

    ISSN： 0385-7719

  74. 5G R&D Activities for High Capacity Technologies with Ultra High-Density Multi-Band and Multi-Access Layered Cells.

    Morihiko Minowa, Hiroyuki Seki, Yukihiko Okumura, Satoshi Suyama, Jun Terada, Satoshi Shigematsu, Yasushi Takatori, Hiroaki Asano, Yukio Hirano, Yasushi Yamao, Fumiyuki Adachi, Masataka Nakazawa

    電子情報通信学会技術研究報告　118　(474(RCS2018 282-338)(Web))　1-5　2019

    Publisher: IEEE

    DOI： 10.1109/VTCSpring.2019.8746622 　

    ISSN： 0913-5685

  75. Wavelength-tunable sub-picosecond optical switch over entire C-band using nonlinear optical loop mirror.

    Ryoya Hirata, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa

    IEICE Electron. Express　16　(23)　20190664-20190664　2019

    DOI： 10.1587/elex.16.20190664 　

    ISSN： 0913-5685

  76. 光時分割多重(OTDM)研究が創出した最先端光技術とその将来展望

    中沢正隆

    電子情報通信学会誌　102　(8)　2019

    ISSN： 0913-5693

  77. GAWBS Noise Characteristics in Digital Coherent Transmission in Various Optical Fibers.

    Naoya Takefushi, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    電子情報通信学会技術研究報告　119　(93(OCS2019 10-19)](Web))　1-3　2019

    Publisher: IEEE

    DOI： 10.23919/PS.2019.8818113 　

    ISSN： 0913-5685

  78. 50.4 Tbit/s, L-band 480 ch-WDM, 128 QAM-160 km Digital Coherent Optical Transmission Using an Injection-locked Homodyne Receiver

    管貴志, 葛西恵介, 吉田真人, 廣岡俊彦, 中沢正隆

    電子情報通信学会技術研究報告　119　(93(OCS2019 10-19)](Web))　2019

    ISSN： 0913-5685

  79. 通信波長帯光源を用いた小型絶対重力計TAG-1の運用と系統誤差評価

    新谷昌人, 葛西恵介, 吉田真人, 中沢正隆, 田村良明, 坪川恒也

    日本測地学会講演会要旨　132nd　2019

  80. 次世代モバイルフロントホール用256QAMオンライン双方向コヒーレント伝送

    吉田真人, 管貴志, 葛西恵介, 廣岡俊彦, 岩月勝美, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2019　2019

    ISSN： 1349-144X

  81. リアルタイム偏波多重256~512QAMデジタルコヒーレント光伝送

    吉田真人, 葛西恵介, 廣岡俊彦, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2019　2019

    ISSN： 1349-144X

  82. 256QAM WDMオンライン双方向コヒーレント伝送を用いた次世代C-RANモバイルフロントホール

    管貴志, 吉田真人, 葛西恵介, 廣岡俊彦, 岩月勝美, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2019　2019

    ISSN： 1349-144X

  83. 5G実現に向けた超高密度マルチバンド・マルチアクセス多層セル構成による大容量化技術の研究開発

    箕輪守彦, 関宏之, 奥村幸彦, 須山聡, 寺田純, 重松智志, 鷹取泰司, 浅野弘明, 平野幸男, 山尾泰, 安達文幸, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2019　2019

    ISSN： 1349-144X

  84. デジタルコヒーレント光伝送における各種ファイバのGAWBS雑音特性

    竹節直也, 吉田真人, 葛西恵介, 廣岡俊彦, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2019　2019

    ISSN： 1349-144X

  85. 注入同期法を用いた200Gbit/s,10Gsymbol/s-1024QAM160kmデジタルコヒーレント光伝送

    葛西恵介, 岡本聖司, 吉田真人, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2019　2019

    ISSN： 1349-144X

  86. 高精度光位相制御技術を用いた超多値QAMコヒーレント光伝送

    吉田真人, 葛西恵介, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2019　2019

    ISSN： 1349-144X

  87. 50.4Tbit/s,L-band WDM128QAM-160kmコヒーレント光伝送

    管貴志, 葛西恵介, 吉田真人, 廣岡俊彦, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2019　2019

    ISSN： 1349-144X

  88. 非線形光ループミラーを用いたフルCバンドサブピコ秒光スイッチ

    平田綾也, 廣岡俊彦, 吉田真人, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2019　2019

    ISSN： 1349-144X

  89. 線幅8kHz,C+Lバンド波長可変LDの波長可変特性

    葛西恵介, 中沢正隆, 友松泰則, 遠藤尚

    電子情報通信学会大会講演論文集(CD-ROM)　2019　2019

    ISSN： 1349-144X

  90. Real-Time 256 QAM Bi-directional Coherent Transmission in Next Generation Mobile Fronthaul. Peer-reviewed

    Masato Yoshida, Takashi Kan, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    電子情報通信学会技術研究報告　117　(423(OCS2017 67-78))　1-3　2019

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI： 10.23919/PS.2019.8817867 　

    ISSN： 0913-5685

  91. Single-channel 10.2 Tbit/s (2.56 Tbaud) optical Nyquist pulse transmission over 300 km

    Toshihiko Hirooka, Ryoya Hirata, Jianping Wang, Masato Yoshida, Masataka Nakazawa

    OPTICS EXPRESS　26　(21)　27221-27236　2018/10

    DOI： 10.1364/OE.26.027221 　

    ISSN： 1094-4087

  92. Single-channel 7.68 Tbit/s, 64 QAM coherent Nyquist pulse transmission over 150 km with a spectral efficiency of 9.7 bit/s/Hz

    Kosuke Kimura, Junpei Nitta, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    OPTICS EXPRESS　26　(13)　17418-17428　2018/06

    DOI： 10.1364/OE.26.017418 　

    ISSN： 1094-4087

  93. Single-channel 200 Gbit/s, 10 Gsymbol/s-1024 QAM injection-locked coherent transmission over 160 km with a pilot-assisted adaptive equalizer

    Yixin Wang, Seiji Okamoto, Keisuke Kasai, Masato Yoshida, Masataka Nakazawa

    OPTICS EXPRESS　26　(13)　17015-17024　2018/06

    DOI： 10.1364/OE.26.017015 　

    ISSN： 1094-4087

  94. A New Optical Phase-Locked System between Ultrashort Pulses for 640 Gbaud Nyquist OTDM Coherent QAM Transmission Peer-reviewed

    Kosuke Kimura, Junpei Nitta, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    European Conference on Optical Communication, ECOC　2017-　1-3　2018/04/24

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI： 10.1109/ECOC.2017.8345851 　

  95. Single-carrier 552 Gbit/s, 46 Gbaud 64 QAM Coherent Transmission over 100 km with Co-propagating 10 Gbit/s-OOK Signals Through a Deployed ROADM Network Peer-reviewed

    Keisuke Kasai, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa, Masaki Shiraiwa, Yoshinari Awaji, Naoya Wada

    European Conference on Optical Communication, ECOC　2017-　1-3　2018/04/24

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI： 10.1109/ECOC.2017.8345944 　

  96. Observation of guided acoustic-wave Brillouin scattering noise and its compensation in digital coherent optical fiber transmission

    Masataka Nakazawa, Masato Yoshida, Masaki Terayama, Seiji Okamoto, Keisuke Kasai, Toshihiko Hirooka

    OPTICS EXPRESS　26　(7)　9165-9181　2018/04

    DOI： 10.1364/OE.26.009165 　

    ISSN： 1094-4087

  97. 8 kHz linewidth, 50 mW output, full C-band wavelength tunable DFB LD array with self-optical feedback Peer-reviewed

    Keisuke Kasai, Masataka Nakazawa, Mitsuteru Ishikawa, Hiroyuki Ishii

    Optics Express　26　(5)　5675-5685　2018/03/05

    Publisher: OSA - The Optical Society

    DOI： 10.1364/OE.26.005675 　

    ISSN： 1094-4087

  98. 10.16-Peta-B/s Dense SDM/WDM Transmission Over 6-Mode 19-Core Fiber Across the C plus L Band Peer-reviewed

    Daiki Soma, Yuta Wakayama, Shohei Beppu, Seiya Sumita, Takehiro Tsuritani, Tetsuya Hayashi, Takuji Nagashima, Masato Suzuki, Masato Yoshida, Keisuke Kasai, Masataka Nakazawa, Hidenori Takahashi, Koji Igarashi, Itsuro Morita, Masatoshi Suzuki

    JOURNAL OF LIGHTWAVE TECHNOLOGY　36　(6)　1362-1368　2018/03

    DOI： 10.1109/JLT.2018.2799380 　

    ISSN： 0733-8724

    eISSN： 1558-2213

  99. 50.4 Tbit/s, 128 QAM L-band WDM Injection-locked Coherent Transmission over 160 km with Spectral Efficiency of 10.5 bit/s/Hz

    Takashi Kan, Keisuke Kasai, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    23RD OPTO-ELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC2018)　2018

    ISSN： 2166-8884

    eISSN： 2166-8892

  100. 200 Gbit/s, 10 Gsymbol/s-1024 QAM Injection Locked Coherent Transmission over 160 km with a Pilot-assisted Adaptive Equalizer

    Keisuke Kasai, Yixing Wang, Seiji Okamoto, Masato Yoshida, Masataka Nakazawa

    23RD OPTO-ELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC2018)　2018

    ISSN： 2166-8884

    eISSN： 2166-8892

  101. Single-Channel 7.68 Tbit/s, 64 QAM Coherent Nyquist Pulse Transmission over 150 km with a Spectral Efficiency of 9.7 bit/s/Hz

    Kosuke Kimura, Junpei Nitta, Masato Yoshida, Keisuke Kasai, Toshihiro Hirooka, Masataka Nakazawa

    23RD OPTO-ELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC2018)　2018

    ISSN： 2166-8884

    eISSN： 2166-8892

  102. Reverse Phase Modulation Technique for GAWBS Noise Error Floor Elimination in 1024 QAM-160 km Digital Coherent Transmission

    Masato Yoshida, Naoya Takefushi, Masaki Terayama, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    23RD OPTO-ELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC2018)　2018

    ISSN： 2166-8884

    eISSN： 2166-8892

  103. 4096 QAM (72 Gbit/s) Single-Carrier Coherent Optical Transmission with a Potential SE of 15.8 bit/s/Hz in All-Raman Amplified 160 km Fiber Link.

    Masaki Terayama, Seiji Okamoto, Keisuke Kasai, Masato Yoshida, Masataka Nakazawa

    Optical Fiber Communications Conference and Exposition(OFC)　1-3　2018

    Publisher: IEEE

  104. Experimental and Numerical Comparison of Probabilistically-Shaped 4096 QAM and Uniformly-Shaped 1024 QAM in All-Raman Amplified 160 km Transmission.

    Seiji Okamoto, Masaki Terayama, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    Optical Fiber Communications Conference and Exposition(OFC)　1-3　2018

    Publisher: IEEE

  105. Secure Transmission using QAM Quantum Noise Stream Cipher with Continuous Variable QKD.

    Masataka Nakazawa, Masato Yoshida, Takuya Hirano

    Optical Fiber Communications Conference and Exposition(OFC)　1-3　2018

    Publisher: IEEE

  106. Observation of Guided Acoustic-Wave Brillouin Scattering and its Digital Compensation in Coherent QAM Transmission.

    Masataka Nakazawa, Masaki Terayama, Seiji Okamoto, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka

    Optical Fiber Communications Conference and Exposition(OFC)　1-3　2018

    Publisher: IEEE

  107. Backward-Rayleigh-Scattering Suppressed 160 Gbit/s 256 QAM Injection-Locked Bidirectional Coherent Transmission for Next Generation Mobile Fronthaul.

    Keisuke Kasai, Masato Yoshida, Toshihiko Hirooka, Katsumi Iwatsuki, Masataka Nakazawa

    European Conference on Optical Communication(ECOC)　1-3　2018

    Publisher: IEEE

    DOI： 10.1109/ECOC.2018.8535196 　

  108. 単一チャンネル7.68Tbit/s-150km,64QAMコヒーレントナイキストパルス伝送

    新田純平, 木村光佑, 吉田真人, 葛西恵介, 廣岡俊彦, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2018　2018

    ISSN： 1349-144X

  109. 4096QAM(72Gbit/s)-160kmディジタルコヒーレント光伝送

    寺山雅樹, 岡本聖司, 葛西恵介, 吉田真人, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2018　2018

    ISSN： 1349-144X

  110. 光注入同期法を用いた次世代モバイルフロントホール用160Gbit/s,256QAMデジタルコヒーレント伝送

    葛西恵介, WANG Yixin, 吉田真人, 廣岡俊彦, 岩月勝美, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2018　2018

    ISSN： 1349-144X

  111. 空間多重光通信技術の最前線 空間多重伝送における光計測-マルチチャネルOTDRによるMCFおよびFMFのモード結合の測定-

    吉田真人, 中沢正隆

    Optronics　(440)　2018

    ISSN： 0286-9659

  112. 空間多重光通信技術の最前線 EXAT研究会/3M技術の10年を振り返って

    中沢正隆, 淡路祥成

    Optronics　(440)　2018

    ISSN： 0286-9659

  113. 注入同期法を用いた12bit/s/Hz,58.2Tbit/s,256QAM-160km CバンドWDM伝送

    管貴志, 葛西恵介, 吉田真人, 廣岡俊彦, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2018　2018

    ISSN： 1349-144X

  114. 単一チャネル10.2Tbit/s-300km光ナイキストパルス伝送

    平田綾也, WANG Jianping, 廣岡俊彦, 吉田真人, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2018　2018

    ISSN： 1349-144X

  115. GAWBS位相雑音補償による1024QAMコヒーレント光伝送におけるエラーフロアの抑制

    吉田真人, 竹節直也, 葛西恵介, 廣岡俊彦, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2018　2018

    ISSN： 1349-144X

  116. 自己光帰還法を用いた線幅8kHz,出力50mW,C帯波長可変DFB LD

    葛西恵介, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2018　2018

    ISSN： 1349-144X

  117. Oscillation characteristics of a narrow linewidth DFB LD array with an optical feedback method

    葛西恵介, 中沢正隆

    電子情報通信学会技術研究報告　118　(186(EMD2018 20-36))　2018

    ISSN： 0913-5685

  118. PS-4096QAM信号と1024QAM信号の160km伝送特性比較

    岡本聖司, 岡本聖司, 寺山雅樹, 吉田真人, 葛西恵介, 廣岡俊彦, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2018　2018

    ISSN： 1349-144X

  119. 空間分割多重光通信技術の進展 10ペタビット級光伝送実験の成功

    相馬大樹, 若山雄太, 別府翔平, 角田聖也, 釣谷剛宏, 林哲也, 永島拓志, 鈴木雅人, 吉田真人, 葛西恵介, 中沢正隆, 高橋英憲, 五十嵐浩司, 五十嵐浩司, 森田逸郎, 鈴木正敏

    O plus E　(463)　2018

    ISSN： 0911-5943

  120. 光ナイキストパルスを用いた単一チャネル10Tbit/s級超高速伝送

    廣岡俊彦, 吉田真人, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2018　2018

    ISSN： 1349-144X

  121. Single-Channel 10.2 Tbit/s PDM-DQPSK Nyquist Pulse Transmission over 300 km.

    Toshihiko Hirooka, Ryoya Hirata, Jianping Wang, Masato Yoshida, Masataka Nakazawa

    電子情報通信学会技術研究報告　118　(238(OFT2018 13-51)(Web))　1-3　2018

    Publisher: IEEE

    DOI： 10.1109/ECOC.2018.8535329 　

    ISSN： 0913-5685

  122. 12 bit/s/Hz, 58.2 Tbit/s, 256 QAM-160 km C-band WDM Transmission Using an Injection Locking Technique

    管貴志, 葛西恵介, 吉田真人, 廣岡俊彦, 中沢正隆

    電子情報通信学会技術研究報告　118　(238(OFT2018 13-51)(Web))　2018

    ISSN： 0913-5685

  123. Observation of GAWBS Noise and Development of its Compensation Technique in Digital Coherent Optical Transmission

    竹節直也, 吉田真人, 葛西恵介, 廣岡俊彦, 中沢正隆

    電子情報通信学会技術研究報告　118　(238(OFT2018 13-51)(Web))　2018

    ISSN： 0913-5685

  124. Single-channel 7.68 Tbit/s, 64 QAM coherent Nyquist pulse transmission over 150 km with a spectral efficiency of 9.7 bit/s/Hz

    木村光佑, 新田純平, 吉田真人, 葛西恵介, 廣岡俊彦, 中沢正隆

    電子情報通信学会技術研究報告　118　(238(OFT2018 13-51)(Web))　2018

    ISSN： 0913-5685

  125. Injection-locked Homodyne Detection for Higher-order QAM Transmission. Invited Peer-reviewed

    Keisuke Kasai, Yixin Wang, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    European Conference on Optical Communication (ECOC 2016)　1-3　2018

    Publisher: IEEE

  126. Narrow Linewidth Tunable DFB Laser Array Integrated With Optical Feedback Planar Lightwave Circuit (PLC) Peer-reviewed

    Hiroyuki Ishii, Naoki Fujiwara, Kei Watanabe, Shigeru Kanazawa, Mikitaka Itoh, Hirokazu Takenouchi, Yutaka Miyamoto, Keisuke Kasai, Masataka Nakazawa

    IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS　23　(6)　1501007　2017/11

    DOI： 10.1109/JSTQE.2017.2693021 　

    ISSN： 1077-260X

    eISSN： 1558-4542

  127. 1.5 mu m, mode-hop-free full C-band wavelength tunable laser diode with a linewidth of 8 kHz and a RIN of-130 dB/Hz and its extension to the L- band Peer-reviewed

    Keisuke Kasai, Masataka Nakazawa, Yasunori Tomomatsu, Takashmi Endo

    OPTICS EXPRESS　25　(18)　22113-22124　2017/09

    DOI： 10.1364/OE.25.022113 　

    ISSN： 1094-4087

  128. 42.3 Tbit/s, 18 Gbaud 64 QAM WDM coherent transmission over 160 km in the C-band using an injection-locked homodyne receiver with a spectral efficiency of 9 bit/s/Hz Peer-reviewed

    Takashi Kan, Keisuke Kasai, Masato Yoshida, Masataka Nakazawa

    OPTICS EXPRESS　25　(19)　22726-22737　2017/09

    DOI： 10.1364/OE.25.022726 　

    ISSN： 1094-4087

  129. Discrete solitons in optical fiber systems with large pre-dispersion Peer-reviewed

    Shiva Kumar, Masataka Nakazawa

    OPTICS EXPRESS　25　(17)　19923-19945　2017/08

    DOI： 10.1364/OE.25.019923 　

    ISSN： 1094-4087

  130. QAM Quantum Noise Stream Cipher Transmission Over 100 km With Continuous Variable Quantum Key Distribution Peer-reviewed

    Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka, Keisuke Kasai, Takuya Hirano, Tsubasa Ichikawa, Ryo Namiki

    IEEE JOURNAL OF QUANTUM ELECTRONICS　53　(4)　8000316　2017/08

    DOI： 10.1109/JQE.2017.2708523 　

    ISSN： 0018-9197

    eISSN： 1558-1713

  131. Low-loss and reflection-free fused type fan-out device for 7-core fiber based on a bundled structure Peer-reviewed

    Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    OPTICS EXPRESS　25　(16)　18817-18826　2017/08

    DOI： 10.1364/OE.25.018817 　

    ISSN： 1094-4087

  132. Invention Of LD-pumped EDFA And Their Applications From Soliton To Coherent Nyquist Pulse Transmission Invited Peer-reviewed

    M. Nakazawa

    the Pacific Rim Conference on Lasers and Electro‐Optics (CLEO-PR 2017)　1-3F-2　2017/08

  133. 1024 QAM Coherent Optical Transmission In 31 Km-long, 19-core Fiber With Low Crosstalk And Large Effective Area Peer-reviewed

    M. Yoshida, K. Kasai, T. Hirooka, M. Nakazawa, K. Imamura, R. Sugizaki

    Opto-Electronics and Communications Conference (OECC 2017)　3-1K-2　2017/08

  134. Recent Progress on Ultra-High Capacity Optical Transmission using Multi-Level, Multi-Core, and Multi-Mode Techniques Invited Peer-reviewed

    M. Nakazawa

    the 24th General Congress of International Commission for Optics(ICO-24)　Tu2E-01　2017/08

  135. Progress on 3M Communication Systems Invited Peer-reviewed

    M. Nakazawa

    International Symposium on Ultrafast Photonic Technologies (ISUPT 2017)　Invited talk　2017/07

  136. Single-channel 3.84 Tbit/s, 64 QAM coherent Nyquist pulse transmission over 150 km with a spectral efficiency of 10.6 bit/s/Hz Peer-reviewed

    Junpei Nitta, Masato Yoshida, Kosuke Kimura, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    OPTICS EXPRESS　25　(13)　15199-15207　2017/06

    DOI： 10.1364/OE.25.015199 　

    ISSN： 1094-4087

  137. New Optical Phase-Locking System Based on Mode-Locked Fiber Laser for 640 Gbaud Coherent Nyquist QAM Transmission

    Tohoku-Section Joint Convention Record of Institutes of Electrical and Information Engineers, Japan　2017　22-22　2017

    Publisher: Organizing Committee of Tohoku-Section Joint Convention of Institutes of Electrical and Information Engineers, Japan

    DOI： 10.11528/tsjc.2017.0_22 　

  138. A full C-band wavelength tunable laser diode with narrow linewidth and low intensity noise characteristics

    葛西恵介, 中沢正隆, 友松泰則, 遠藤尚

    電子情報通信学会技術研究報告　117　(194(OPE2017 48-67))　2017

    ISSN： 0913-5685

  139. 単一チャネル3.84Tbit/s,64QAMコヒーレントナイキストパルス信号の150km伝送

    新田純平, 木村光佑, 吉田真人, 葛西恵介, 廣岡俊彦, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2017　2017

    ISSN： 1349-144X

  140. 光注入同期を用いた42.3Tbit/s,C-band WDM64QAM-160kmコヒーレント伝送

    管貴志, 葛西恵介, 吉田真人, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2017　2017

    ISSN： 1349-144X

  141. A 40 GHz, 770 fs regeneratively mode-locked erbium fiber laser operating at 1.6 µm. Peer-reviewed

    Koudai Harako, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    IEICE Electron. Express　14　(19)　20170829-20170829　2017

    DOI： 10.1587/elex.14.20170829 　

    ISSN： 1349-2543

  142. Single-Carrier 216 Gbit/s, 12 Gsymbol/s 512 QAM Coherent Transmission over 160 km with Injection-locked Homodyne Detection Peer-reviewed

    Yixin Wang, Keisuke Kasai, Masato Yoshida, Masataka Nakazawa

    2017 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)　Tu2E.1　2017

  143. Full C-band, Mode-Hop-Free Wavelength-Tunable Laser Diode with a Linewidth of 8 kHz and a RIN of-130 dB/Hz Peer-reviewed

    Keisuke Kasai, Masataka Nakazawa, Yasunori Tomomatsu, Takashi Endo

    2017 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)　W1E.2　2017

  144. Fabrication of Multi Core Fiber by Using Slurry Casting Method Peer-reviewed

    Jun Yamamoto, Tamotsu Yajima, Yusuke Kinoshita, Futoshi Ishii, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    2017 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)　Th1H.5　2017

  145. Single-Channel 3.84 Tbit/s, 64 QAM Coherent Nyquist Pulse Transmission over 150km with Frequency-Stabilized and Mode-Locked Laser Peer-reviewed

    Masato Yoshida, Junpei Nitta, Kosuke Kimura, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    2017 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)　Th2A.52　2017

  146. 42.3-Tbits/s, 18-Gbaud 64QAM WDM Coherent Transmission of 160 km over Full C-based using an Injection Locking Technique with a Spectral Efficiency of 9 bit/s/Hz Peer-reviewed

    Takashi Kan, Keisuke Kasai, Masato Yoshida, Masataka Nakazawa

    2017 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)　Th3F.5　2017

  147. 40 GHz, 770 fs harmonically and regeneratively FM mode-locked erbium fiber laser in L-band Peer-reviewed

    Koudai Harako, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    Optics InfoBase Conference Papers　2017　SM4L.2　2017

    Publisher: OSA - The Optical Society

    DOI： 10.1364/CLEO_SI.2017.SM4L.2 　

  148. Subpicosecond coherent Nyquist pulse generation for 1-Tbaud transmission using a C2H2 frequency-stabilized CW Laser and a 40 GHz optical comb generator Peer-reviewed

    Daiki Suzuki, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    Optics InfoBase Conference Papers　2017　SM2L.5　2017

    Publisher: OSA - The Optical Society

    DOI： 10.1364/CLEO_SI.2017.SM2L.5 　

  149. Single-channel 5.12 Tbit/s (1.28 Tbaud) DQPSK transmission over 300 km using non-coherent Nyquist pulses Peer-reviewed

    Daiki Suzuki, Koudai Harako, Toshihiko Hirooka, Masataka Nakazawa

    OPTICS EXPRESS　24　(26)　29683-29691　2016/12

    DOI： 10.1364/OE.24.029682 　

    ISSN： 1094-4087

  150. 440 fs, 9.2 GHz regeneratively mode-locked erbium fiber laser with a combination of higher-order solitons and a SESAM saturable absorber Peer-reviewed

    Toshihiko Hirooka, Kazunari Tokuhira, Masato Yoshida, Masataka Nakazawa

    OPTICS EXPRESS　24　(21)　24255-24264　2016/10

    DOI： 10.1364/OE.24.024255 　

    ISSN： 1094-4087

  151. 1.55 mu m hydrogen cyanide optical frequency-stabilized and 10 GHz repetition-rate-stabilized mode-locked fiber laser Peer-reviewed

    Masato Yoshida, Kazuki Yoshida, Keisuke Kasai, Masataka Nakazawa

    OPTICS EXPRESS　24　(21)　24287-24296　2016/10

    DOI： 10.1364/OE.24.024287 　

    ISSN： 1094-4087

  152. Roll-off factor dependence of Nyquist pulse transmission Peer-reviewed

    Koudai Harako, Daiki Suzuki, Toshihiko Hirooka, Masataka Nakazawa

    OPTICS EXPRESS　24　(19)　21986-21994　2016/09

    DOI： 10.1364/OE.24.021986 　

    ISSN： 1094-4087

  153. 320 Gbit/s, 20 Gsymbol/s 256 QAM coherent transmission over 160 km by using injection-locked local oscillator Peer-reviewed

    Yixin Wang, Keisuke Kasai, Masato Yoshida, Masataka Nakazawa

    OPTICS EXPRESS　24　(19)　22088-22096　2016/09

    DOI： 10.1364/OE.24.022088 　

    ISSN： 1094-4087

  154. Single-channel 5.12 Tbit/s (1.28 Tbaud) DQPSK Transmission over 300 km Using Non-coherent Nyquist Pulses Peer-reviewed

    D. Suzuki, K. Harako, T. Hirooka, M. Nakazawa

    European Conference on Optical Communication (ECOC 2016)　W.4.P1.SC5.49　2016/09

  155. 552 Gbit/s, 46 Gbaud, 64 QAM Coherent Transmission over 160 km with Simple LD-based Injection-locked Homodyne Detection Peer-reviewed

    K. Kasai, M. Yoshida, M. Nakazawa

    European Conference on Optical Communication (ECOC 2016)　W.4.P1.SC5.51　2016/09

  156. Real-time 70 Gbit/s, 128 QAM Quantum Noise Stream Cipher Transmission over 100 km with Secret Keys Delivered by Continuous Variable Quantum Key Distribution System Peer-reviewed

    M. Nakazawa, M. Yoshida, T. Hirooka, K. Kasai, T Hirano

    European Conference on Optical Communication (ECOC 2016)　W.4.P1.SC5.59　2016/09

  157. A Non-Perturbative Mode-Locking Theory of the Nyquist Laser With a Dirichlet Kernel Solution Peer-reviewed

    Masataka Nakazawa, Toshihiko Hirooka

    IEEE JOURNAL OF QUANTUM ELECTRONICS　52　(8)　1300113　2016/08

    DOI： 10.1109/JQE.2016.2584585 　

    ISSN： 0018-9197

    eISSN： 1558-1713

  158. A 1.55 mu m, 271 fs and 1.07 mu m, 294 fs simultaneously mode-locked Er- and Yb-doped fiber laser with a single SWNT/PVA saturable absorber Peer-reviewed

    Masatoshi Nakao, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    IEICE ELECTRONICS EXPRESS　13　(14)　20160515　2016/07

    DOI： 10.1587/elex.13.20160515 　

    ISSN： 1349-2543

  159. 1024 QAM, 7-core fiber/multi-core EDFA transmission over 100 km with an aggregated spectral efficiency of 109 bit/s/Hz Peer-reviewed

    M. Yoshida, K. Kasai, T. Hirooka, M. Nakazawa

    2016 Opto-Electronics and Communications Conference (OECC2016)　MB2-5　2016/07

  160. “Multi” is everywhere Invited Peer-reviewed

    M. Nakazawa

    Conference on Lasers and Electro-Optics (CLEO 2016)　plenary talk　2016/06

  161. Fused type fan-out device for multi-core fiber based on bundled structure Peer-reviewed

    M. Yoshida, T. Hirooka, M. Nakazawa

    Optical Fiber Communication Conference (OFC2016)　Tu3I.2　2016/03

  162. Mode coupling measurement at a splice point between few-mode fibers using a synchronous multi-channel OTDR Peer-reviewed

    M. Yoshida, T. Hirooka, M. Nakazawa

    Optical Fiber Communication Conference (OFC2016)　Th1J.4　2016/03

  163. Mode locking theory of the Nyquist laser Peer-reviewed

    Masataka Nakazawa, Toshihiko Hirooka

    OPTICS EXPRESS　24　(5)　4981-4995　2016/03

    DOI： 10.1364/OE.24.004981 　

    ISSN： 1094-4087

  164. 295 mW output, frequency-stabilized erbium silica fiber laser with a linewidth of 5 kHz and a RIN of-120 dB/Hz Peer-reviewed

    Keisuke Kasai, Masato Yoshida, Masataka Nakazawa

    OPTICS EXPRESS　24　(3)　2737-2748　2016/02

    DOI： 10.1364/OE.24.002737 　

    ISSN： 1094-4087

  165. Ultra-multilevel digital coherent optical transmission employing a narrow linewidth laser, an optical phase-locked loop circuit and injection-locking scheme Invited Peer-reviewed

    K. Kasai, M. Nakazawa

    The Review of Laser Engineering (in Japanese)　44　(2)　106-110　2016/02

  166. Injection-locked homodyne detection system for higher-order QAM digital coherent transmission

    Keisuke Kasai, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    European Conference on Optical Communication, ECOC　34-36　2016

    Publisher: Institute of Electrical and Electronics Engineers Inc.

  167. Preliminary experiment on 4096 QAM coherent optical transmission at 1.5 Gsymbol/s over 160 km

    Tohoku-Section Joint Convention Record of Institutes of Electrical and Information Engineers, Japan　2016　7-7　2016

    Publisher: Organizing Committee of Tohoku-Section Joint Convention of Institutes of Electrical and Information Engineers, Japan

    DOI： 10.11528/tsjc.2016.0_7 　

  168. 45.12 Tbit/s, 235 ch-WDM 64 QAM Coherent Transmission over 160 km with an Injection Locked Homodyne Receiver

    Tohoku-Section Joint Convention Record of Institutes of Electrical and Information Engineers, Japan　2016　6-6　2016

    Publisher: Organizing Committee of Tohoku-Section Joint Convention of Institutes of Electrical and Information Engineers, Japan

    DOI： 10.11528/tsjc.2016.0_6 　

  169. A Mode Locking Theory of the Nyquist Laser Peer-reviewed

    Masataka Nakazawa, Toshihiko Hirooka

    2016 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)　2016

    ISSN： 2160-9020

  170. Fabrication of OH-free, single-mode fiber by using slurry casting and rod-in-tube method Peer-reviewed

    Tamotsu Yajima, Jun Yamamoto, Yusuke Kinoshita, Futoshi Ishii, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa

    IEICE ELECTRONICS EXPRESS　13　(1)　2016/01

    DOI： 10.1587/elex.12.20151005 　

    ISSN： 1349-2543

  171. Single-channel 40 Gbit/s digital coherent QAM quantum noise stream cipher transmission over 480 km Peer-reviewed

    Masato Yoshida, Toshihiko Hirooka, Keisuke Kasai, Masataka Nakazawa

    OPTICS EXPRESS　24　(1)　652-661　2016/01

    DOI： 10.1364/OE.24.000652 　

    ISSN： 1094-4087

  172. Single-Channel 1.92 Tbit/s, 64 QAM Coherent Nyquist Orthogonal TDM Transmission With a Spectral Efficiency of 10.6 Bit/s/Hz Peer-reviewed

    David Odeke Otuya, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    JOURNAL OF LIGHTWAVE TECHNOLOGY　34　(2)　768-775　2016/01

    DOI： 10.1109/JLT.2015.2468580 　

    ISSN： 0733-8724

    eISSN： 1558-2213

  173. Optical and wireless-integrated next-generation access network based on coherent technologies Invited Peer-reviewed

    Toshihiko Hirooka, Masato Yoshida, Keisuke Kasai, Masataka Nakazawa

    BROADBAND ACCESS COMMUNICATION TECHNOLOGIES X　9772　9772-2　2016

    DOI： 10.1117/12.2211860 　

    ISSN： 0277-786X

  174. A 295 mW Output, HCN Frequency-Stabilized CW Erbium Silica Fiber Laser with a Linewidth of 5 kHz and a RIN of-120 dB/Hz Peer-reviewed

    Keisuke Kasai, Masato Yoshida, Masataka Nakazawa

    2016 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)　W3E.1　2016

  175. A 440 fs, 9.2 GHz Hybrid Mode-Locked Erbium Fiber Laser with a Combination of Higher-Order Solitons and a SESAM Saturable Absorber Peer-reviewed

    Toshihiko Hirooka, Kazunari Tokuhira, Masato Yoshida, Masataka Nakazawa

    2016 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)　STu1P.4　2016

    ISSN： 2160-9020

  176. A 0.95 ps, 10 GHz, 60 mW HCN Frequency-Stabilized and Mode-Locked Fiber Laser at 1.55 mu m Peer-reviewed

    Masato Yoshida, Kazuki Yoshida, Keisuke Kasai, Masataka Nakazawa

    2016 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)　STu1P.3　2016

    ISSN： 2160-9020

  177. Ultrahigh Speed and High Spectral Efficiency Transmission Using Optical Nyquist Pulses Invited Peer-reviewed

    Masataka Nakazawa

    2016 21ST OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC) HELD JOINTLY WITH 2016 INTERNATIONAL CONFERENCE ON PHOTONICS IN SWITCHING (PS)　MB1-1　2016

  178. Roll-off Factor Dependence of System Performance in 1.28 Tbit/s/ch-525 km Nyquist Pulse Transmission Peer-reviewed

    Koudai Harako, Daiki Suzuki, Toshihiko Hirooka, Masataka Nakazawa

    2016 21ST OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC) HELD JOINTLY WITH 2016 INTERNATIONAL CONFERENCE ON PHOTONICS IN SWITCHING (PS)　MB1-2　2016

  179. 320 Gbit/s, 256 QAM LD-based Coherent Transmission over 160 km with an Injection-locked Homodyne Detection Technique Peer-reviewed

    Yixin Wang, Keisuke Kasai, Masato Yoshida, Masataka Nakazawa

    2016 21ST OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC) HELD JOINTLY WITH 2016 INTERNATIONAL CONFERENCE ON PHOTONICS IN SWITCHING (PS)　ThB3-3　2016

  180. First demonstration of digital coherent transmission in a deployed ROADM network with a 120 Gbit/s polarization-multiplexed 64 QAM signal Peer-reviewed

    Toshihiko Hirookaa, Keisuke Kasai, Yixin Wang, Masataka Nakazawa, Masaki Shiraiwa, Yoshinari Awaji, Naoya Wada

    IEICE ELECTRONICS EXPRESS　12　(23)　20150884　2015/12

    DOI： 10.1587/elex.12.20150884 　

    ISSN： 1349-2543

  181. Q-factor analysis of nonlinear impairments in ultrahigh-speed Nyquist pulse transmission Peer-reviewed

    Toshihiko Hirooka, Masataka Nakazawa

    OPTICS EXPRESS　23　(26)　33484-33492　2015/12

    DOI： 10.1364/OE.23.033484 　

    ISSN： 1094-4087

  182. 448 Gbit/s, 32 Gbaud 128 QAM coherent transmission over 150 km with a potential spectral efficiency of 10.7 bit/s/Hz Peer-reviewed

    Keisuke Kasai, Yixin Wang, David Odeke Otuya, Masato Yoshida, Masataka Nakazawa

    OPTICS EXPRESS　23　(22)　28423-28429　2015/11

    DOI： 10.1364/OE.23.028423 　

    ISSN： 1094-4087

  183. 80 Gbit/s, 256 QAM coherent transmission over 150 km with an injection-locked homodyne receiver Peer-reviewed

    Keisuke Kasai, Yixin Wang, Shohei Beppu, Masato Yoshida, Masataka Nakazawa

    OPTICS EXPRESS　23　(22)　29174-29183　2015/11

    DOI： 10.1364/OE.23.029174 　

    ISSN： 1094-4087

  184. 2.56 Tbit/s/ch (640 Gbaud) polarization-multiplexed DQPSK non-coherent Nyquist pulse transmission over 525 km Peer-reviewed

    Koudai Harako, Daiki Seya, Daiki Suzuki, Toshihiko Hirooka, Masataka Nakazawa

    OPTICS EXPRESS　23　(24)　30801-30806　2015/11

    DOI： 10.1364/OE.23.030801 　

    ISSN： 1094-4087

  185. High-speed, high spectrally efficient 64 QAM orthogonal TDM coherent Nyquist pulse transmission Invited Peer-reviewed

    Keisuke Kasai, David Odeke Otuya, Koudai Harako, Toshihiko Hirooka, Masataka Nakazawa

    2015 IEEE Summer Topicals Meeting Series, SUM 2015　76-77　2015/09/09

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI： 10.1109/PHOSST.2015.7248201 　

  186. 1024 QAM, 7-core (60 Gbit/s x 7) fiber transmission over 55 km with an aggregate potential spectral efficiency of 109 bit/s/Hz Peer-reviewed

    Masato Yoshida, Shohei Beppu, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    OPTICS EXPRESS　23　(16)　20760-20766　2015/08

    DOI： 10.1364/OE.23.020760 　

    ISSN： 1094-4087

  187. Ultrafast Nyquist OTDM demultiplexing using optical Nyquist pulse sampling in an all-optical nonlinear switch Peer-reviewed

    Toshihiko Hirooka, Daiki Seya, Koudai Harako, Daiki Suzuki, Masataka Nakazawa

    OPTICS EXPRESS　23　(16)　20858-20866　2015/08

    DOI： 10.1364/OE.23.020858 　

    ISSN： 1094-4087

  188. Distributed mode-coupling measurements in MCF and FMF using a synchronous multi-channel OTDR Invited Peer-reviewed

    M. Nakazawa

    International Symposium on Ultrafast Photonic Technologies/Extremely Advanced Transmission Technology (ISUPT/EXAT 2015)　T1.2　2015/07

  189. HCN frequency-stabilized 10 GHz mode-locked fiber laser Peer-reviewed

    K. Yoshida, K. Kasai, M. Yoshida, M. Nakazawa

    International Symposium on Ultrafast Photonic Technologies/Extremely Advanced Transmission Technology (ISUPT/EXAT 2015)　P-34　2015/07

  190. 2.56 Tbit/s/ch polarization-multiplexed DQPSK non-coherent Nyquist pulse transmission over 525 km Peer-reviewed

    D. Suzuki, D. Seya, K. Harako, T. Hirooka, M. Nakazawa

    International Symposium on Ultrafast Photonic Technologies/Extremely Advanced Transmission Technology (ISUPT/EXAT 2015)　P-35　2015/07

  191. Multi-core Fibers and Systems for Space-division Multiplexing Invited Peer-reviewed

    T. Hirooka, M. Yoshida, K. Kasai, M. Nakazawa

    Photonics North 2015　7.60　2015/05

  192. Real-time 10 Gbit/s-16 QAM quantum stream cipher transmission over 320 km with FPGA-based transmitter and receiver Peer-reviewed

    M. Yoshida, T. Hirooka, K. Kasai, M. Nakazawa

    Optical Fiber Communication Conference (OFC2015)　W4F.4　2015/03

  193. 2048 QAM (66 Gbit/s) single-carrier coherent optical transmission over 150 km with a potential SE of 15.3 bit/s/Hz Peer-reviewed

    Shohei Beppu, Keisuke Kasai, Masato Yoshida, Masataka Nakazawa

    OPTICS EXPRESS　23　(4)　4960-4969　2015/02

    DOI： 10.1364/OE.23.004960 　

    ISSN： 1094-4087

  194. 10 GHz, 0.95 ps coherent optical pulse source based on 1.55 μm HCN frequency-stabilized mode-locked fiber laser

    Tohoku-Section Joint Convention Record of Institutes of Electrical and Information Engineers, Japan　2015　2-2　2015

    Publisher: Organizing Committee of Tohoku-Section Joint Convention of Institutes of Electrical and Information Engineers, Japan

    DOI： 10.11528/tsjc.2015.0_2 　

  195. An 11.6 W output, 6 kHz linewidth, single-polarization EDFA-MOPA system with a (C2H2)-C-13 frequency stabilized fiber laser Peer-reviewed

    Akira Fujisaki, Shunichi Matsushita, Keisuke Kasai, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    OPTICS EXPRESS　23　(2)　1081-1087　2015/01

    DOI： 10.1364/OE.23.001081 　

    ISSN： 1094-4087

  196. Ad-Hoc Photonic Network based on Movable and Deployable ICT Resource Unit to meet rapidly changing service demands Peer-reviewed

    Toshikazu Sakano, Tetsuro Komukai, Atsushi Takahara, Toshihiko Hirooka, Masataka Nakazawa

    2015 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)　M2A.1　2015

  197. Single-Channel 1.92 Tbit/s, 64 QAM Coherent Orthogonal TDM Transmission of 160 Gbaud Optical Nyquist Pulses with 10.6 bit/s/Hz Spectral Efficiency Peer-reviewed

    David Odeke Otuya, Koudai Harako, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    2015 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)　M3G.2　2015

  198. 256 QAM (Polarization-multiplexed, 5 Gsymbol/s) Coherent Transmission with an Injection-locked Homodyne Detection Technique Peer-reviewed

    Keisuke Kasai, Shohei Beppu, Yixin Wang, Masataka Nakazawa

    2015 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)　W1E.4　2015

  199. Generation of 10 W, 100 fs, 10 GHz pulse train using high power EDFA-MOPA system with cascaded Raman pumping Peer-reviewed

    Akira Fujisaki, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)　STh1L.7　2015

    ISSN： 2160-9020

  200. Ultrafast spectrally-efficient TDM multiplexing/demultiplexing schemes using orthogonality in coherent optical nyquist pulses Invited Peer-reviewed

    Masataka Nakazawa

    Signal Processing in Photonic Communications, SPPCom 2015　262　2015

    Publisher: Optical Society of America (OSA)

    DOI： 10.1364/SPPCOM.2015.SpM3E.1 　

  201. QAM Quantum Noise Stream Cipher Transmission with Extremely High Security Invited Peer-reviewed

    Masataka Nakazawa

    ECOC 2015 41ST EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION　Th.2.5.1　2015

    DOI： 10.1109/ECOC.2015.7341891 　

  202. Real-time Adaptive 4-64 QAM, 20-60 Gbit/s Quantum Noise Stream Cipher Transmission over 320 km with FPGA-based Transmitter and Receiver Peer-reviewed

    Masato Yoshida, Toshihiko Hirooka, Keisuke Kasai, Masataka Nakazawa

    ECOC 2015 41ST EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION　P.5.13　2015

    DOI： 10.1109/ECOC.2015.7341787 　

  203. QAM Quantum Noise Stream Cipher Using Digital Coherent Optical Transmission Invited Peer-reviewed

    M. Yoshida, T. Hirooka, K. Kasai, M. Nakazawa

    2015 49TH ASILOMAR CONFERENCE ON SIGNALS, SYSTEMS AND COMPUTERS　1007-1011　2015

    DOI： 10.1109/ACSSC.2015.7421290 　

  204. Measurement of mode coupling distribution along a few-mode fiber using a synchronous multi-channel OTDR Peer-reviewed

    Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka

    OPTICS EXPRESS　22　(25)　31299-31309　2014/12

    DOI： 10.1364/OE.22.031299 　

    ISSN： 1094-4087

  205. High-performance TDM demultiplexing of coherent Nyquist pulses using time-domain orthogonality Peer-reviewed

    Koudai Harako, David Odeke Otuya, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    OPTICS EXPRESS　22　(24)　29456-29464　2014/12

    DOI： 10.1364/OE.22.029456 　

    ISSN： 1094-4087

  206. 120 Gbit/s injection-locked homodyne coherent transmission of polarization-multiplexed 64 QAM signals over 150 km Peer-reviewed

    Yixin Wang, Keisuke Kasai, Masato Yoshida, Masataka Nakazawa

    OPTICS EXPRESS　22　(25)　31310-31316　2014/12

    DOI： 10.1364/OE.22.031310 　

    ISSN： 1094-4087

  207. Evolution of EDFA from single-core to multi-core and related recent progress in optical communication Invited Peer-reviewed

    Masataka Nakazawa

    Optical Review　21　(6)　862-874　2014/11/27

    Publisher: SpringerOpen

    DOI： 10.1007/s10043-014-0139-1 　

    ISSN： 1349-9432 1340-6000

  208. Real-time adaptive 4-64 QAM coherent optical transmission over 320 km with FPGA-based transmitter and receiver Peer-reviewed

    Masato Yoshida, Toshihiko Hirooka, Keisuke Kasai, Masataka Nakazawa

    European Conference on Optical Communication, ECOC　Th2.5.2　2014/11/20

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI： 10.1109/ECOC.2014.6963904 　

  209. Exabit Optical Communication Infrastructure Using 3M Scheme Invited Peer-reviewed

    M. Nakazawa

    Asia Communications and Photonics Conference (ACP2014)　Plenary Talk　2014/11

  210. 140 Gbit/s, 128 QAM LD-based Coherent Transmission over 150 km with an Injection-locked Homodyne Detection Technique Peer-reviewed

    Y. Wang, S. Beppu, K. Kasai, M. Yoshida, M. Nakazawa

    Asia Communications and Photonics Conference (ACP2014)　ATh1E.3　2014/11

  211. A Single-channel 40 Gbit/s Digital Coherent QAM Quantum Stream Cipher Transmission over 480 km Peer-reviewed

    M. Nakazawa, M. Yoshida, T. Hirooka

    Asia Communications and Photonics Conference (ACP2014)　ATh4E.1　2014/11

  212. Single-channel 1.92 Tbit/s, Pol-Mux-64 QAM coherent Nyquist pulse transmission over 150 km with a spectral efficiency of 7.5 bit/s/Hz Peer-reviewed

    David Odeke Otuya, Keisuke Kasai, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    OPTICS EXPRESS　22　(20)　23776-23785　2014/10

    DOI： 10.1364/OE.22.023776 　

    ISSN： 1094-4087

  213. The Nyquist laser Peer-reviewed

    Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka

    OPTICA　1　(1)　15-22　2014/07

    DOI： 10.1364/OPTICA.1.000015 　

    ISSN： 2334-2536

  214. Plug-and-Play Optical Interconnection Using Digital Coherent Technology for Resilient Network Based on Movable and Deployable ICT Resource Unit Peer-reviewed

    Tetsuro Komukai, Hirokazu Kubota, Toshikazu Sakano, Toshihiko Hirooka, Masataka Nakazawa

    IEICE TRANSACTIONS ON COMMUNICATIONS　E97B　(7)　1334-1341　2014/07

    DOI： 10.1587/transcom.E97.B.1334 　

    ISSN： 1745-1345

  215. Exabit optical communication explored using 3M scheme Invited Peer-reviewed

    Masataka Nakazawa

    JAPANESE JOURNAL OF APPLIED PHYSICS　53　(8)　08MA01-1-08MA01-9　2014/07

    DOI： 10.7567/JJAP.53.08MA01 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  216. Adaptive 4 similar to 64 QAM real-time coherent optical transmission over 320 km with FPGA-based transmitter and receiver Peer-reviewed

    Masato Yoshida, Toshihiko Hirooka, Keisuke Kasai, Masataka Nakazawa

    OPTICS EXPRESS　22　(13)　16520-16527　2014/06

    DOI： 10.1364/OE.22.016520 　

    ISSN： 1094-4087

  217. QAM quantum stream cipher using digital coherent optical transmission Peer-reviewed

    Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka, Keisuke Kasai

    OPTICS EXPRESS　22　(4)　4098-4107　2014/02

    DOI： 10.1364/OE.22.004098 　

    ISSN： 1094-4087

  218. A 380 fs, 40 GHz mode-locked erbium fiber laser with an MQW nonlinear PM/AM modulator using the pockels effect and the QCSE

    Masataka Nakazawa, Masato Yoshida, Ken Tsuzuki

    Optics InfoBase Conference Papers　2014

    Publisher: Optical Society of America (OSA)

    DOI： 10.1364/cleo_si.2014.stu1n.6 　

    ISSN： 2162-2701

  219. A 160 mW output, 5 kHz linewidth frequency-stabilized erbium silica fiber laser with a short cavity configuration

    Keisuke Kasai, Akira Fujisaki, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa, Shin Masuda

    Optics InfoBase Conference Papers　2014

    Publisher: Optical Society of America (OSA)

    DOI： 10.1364/cleo_si.2014.sw1n.4 　

    ISSN： 2162-2701

  220. 2048 QAM coherent optical transmission over 150 km

    Tohoku-Section Joint Convention Record of Institutes of Electrical and Information Engineers, Japan　2014　(0)　13-13　2014

    Publisher: Organizing Committee of Tohoku-Section Joint Convention of Institutes of Electrical and Information Engineers, Japan

    DOI： 10.11528/tsjc.2014.0_13 　

  221. 1.92 Tbit/s, 64 QAM Coherent Nyquist Pulse Transmission over 150 km with a Spectral Efficiency of 7.5 bit/s/Hz Peer-reviewed

    David Odeke Otuya, Keisuke Kasai, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa

    2014 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)　W1A.4　2014

  222. 2048 QAM (66 Gbit/s) Single-Carrier Coherent Optical Transmission over 150 km with a Potential SE of 15.3 bit/s/Hz Peer-reviewed

    Shohei Beppu, Keisuke Kasai, Masato Yoshida, Masataka Nakazawa

    2014 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)　W1A.6　2014

  223. 100 Gbit/s DP-QPSK Transmission over a 32 km Legacy Multi-Mode GI Fiber Using a Real-Time Digital Coherent Transceiver Peer-reviewed

    Toshihiko Hirooka, Masataka Nakazawa, Tetsuro Komukai, Toshikazu Sakano

    2014 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)　W2A.1　2014

  224. Measurement of Mode Coupling Distribution Along a Few-Mode Fiber Using a Synchronous Multi-Channel OTDR Peer-reviewed

    Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka

    2014 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)　W3D.7　2014

  225. All-Optical High-Performance Demultiplexing Using Optical Nyquist Pulse Sampling Peer-reviewed

    Daiki Seya, Koudai Harako, Toshihiko Hirooka, Masataka Nakazawa

    2014 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)　W4F.2　2014

  226. A 380 fs, 40 GHz Mode-Locked Erbium Fiber Laser with an MQW Nonlinear PM/AM Modulator Using the Pockels Effect and the QCSE Peer-reviewed

    Masataka Nakazawa, Masato Yoshida, Ken Tsuzuki

    2014 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)　STu1N.6　2014

    ISSN： 2160-9020

  227. A 160 mW Output, 5 kHz Linewidth Frequency-Stabilized Erbium Silica Fiber Laser with a Short Cavity Configuration Peer-reviewed

    Keisuke Kasai, Akira Fujisaki, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa, Shin Masuda

    2014 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)　SW1N.4　2014

    ISSN： 2160-9020

  228. Ultrahigh Spectral Efficiency Systems - Pushing the Limits of Multi-level Modulation, Multi-core Fiber, and Multi-mode Control Invited Peer-reviewed

    Masataka Nakazawa

    2014 OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE AND AUSTRALIAN CONFERENCE ON OPTICAL FIBRE TECHNOLOGY (OECC/ACOFT 2014)　597-599　2014

  229. Q Margin Comparison of RZ and Nyquist Optical Pulses in Ultrahigh-Speed TDM Transmission Peer-reviewed

    Toshihiko Hirooka, Lei Chen, Masataka Nakazawa

    2014 OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE AND AUSTRALIAN CONFERENCE ON OPTICAL FIBRE TECHNOLOGY (OECC/ACOFT 2014)　79-80　2014

  230. A 6 kHz Linewidth, Injection-Locked LD Using a Master Erbium Fiber Laser Peer-reviewed

    Yixin Wang, Keisuke Kasai, Masato Yoshida, Masataka Nakazawa

    2014 OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE AND AUSTRALIAN CONFERENCE ON OPTICAL FIBRE TECHNOLOGY (OECC/ACOFT 2014)　417-418　2014

  231. 100 Gbit/s real-time digital coherent transmission over a 32 km legacy multi-mode graded-index fiber Peer-reviewed

    Toshihiko Hirooka, Masataka Nakazawa, Tetsuro Komukai, Toshikazu Sakano

    IEICE ELECTRONICS EXPRESS　11　(15)　20140563　2014

    DOI： 10.1587/elex.11.20140563 　

    ISSN： 1349-2543

  232. 60 Gbit/s, 64 QAM LD-based injection-locked coherent heterodyne transmission over 160 km with a spectral efficiency of 9 bit/s/Hz Peer-reviewed

    Yixin Wang, Keisuke Kasai, Masato Yoshida, Masataka Nakazawa

    IEICE ELECTRONICS EXPRESS　11　(18)　20140601　2014

    DOI： 10.1587/elex.11.20140641 　

    ISSN： 1349-2543

  233. OH-Free, Low Loss Single-Mode Fibre Fabricated by Slurry Casting / Rod-in-Tube Method Peer-reviewed

    Tamotsu Yajima, Jun Yamamoto, Yusuke Kinoshita, Futoshi Ishii, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa

    2014 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)　Th2.4.4　2014

    DOI： 10.1109/ECOC.2014.6963829 　

  234. Novel Ultrafast TDM Demultiplexing Scheme Using Orthogonality in Coherent Nyquist Pulses Peer-reviewed

    Koudai Harako, David Odeke Otuya, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    2014 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)　Tu4.6.5　2014

    DOI： 10.1109/ECOC.2014.6963952 　

  235. A Single-Channel 960 Gbit/s 64 QAM Orthogonal TDM Transmission with a Spectral Efficiency of 10.0 bit/s/Hz Using Coherent Nyquist Pulses Peer-reviewed

    David Odeke Otuya, Koudai Harako, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    2014 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)　We.2.3.4　2014

    DOI： 10.1109/ECOC.2014.6964004 　

  236. Measurement of Mode Coupling Distribution Along a Few-Mode Fiber Using a Synchronous Multi-Channel OTDR Peer-reviewed

    Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka

    2014 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)　22　(25)　31299-31309　2014

    DOI： 10.1364/OE.22.031299 　

  237. OH-Free, Low Loss Single-Mode Fibre Fabricated by Slurry Casting / Rod-in-Tube Method Peer-reviewed

    Tamotsu Yajima, Jun Yamamoto, Yusuke Kinoshita, Futoshi Ishii, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa

    2014 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)　13　(1)　20151005　2014

    DOI： 10.1587/elex.12.20151005 　

  238. Detailed comparison between mode couplings along multi-core fibers and structural irregularities using a synchronous multi-channel OTDR system with a high dynamic range Peer-reviewed

    Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa, Katsunori Imamura, Ryuichi Sugizaki, Takeshi Yagi

    Optics Express　21　(24)　29157-29164　2013/12/02

    Publisher: Optical Society of American (OSA)

    DOI： 10.1364/OE.21.029157 　

    ISSN： 1094-4087

  239. Low-loss photonic crystal fiber fabricated by a slurry casting method Peer-reviewed

    Tamotsu Yajima, Jun Yamamoto, Futoshi Ishii, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa

    OPTICS EXPRESS　21　(25)　30500-30506　2013/12

    DOI： 10.1364/OE.21.030500 　

    ISSN： 1094-4087

  240. 120 Gbit/s, polarization-multiplexed 10 Gsymbol/s, 64 QAM coherent transmission over 150 km using an optical voltage controlled oscillator Peer-reviewed

    Yixin Wang, Keisuke Kasai, Tatsunori Omiya, Masataka Nakazawa

    OPTICS EXPRESS　21　(23)　28290-28296　2013/11

    DOI： 10.1364/OE.21.028290 　

    ISSN： 1094-4087

  241. A single-channel 1.28 Tbit/s-58 km transmission in the 1.1 mu m band with wideband GVD and slope compensation Peer-reviewed

    Kengo Koizumi, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    OPTICS EXPRESS　21　(23)　29055-29064　2013/11

    DOI： 10.1364/OE.21.029055 　

    ISSN： 1094-4087

  242. Nondestructive measurement of mode-coupling along a multi-core fiber using a synchronous multi-channel OTDR Invited Peer-reviewed

    M. Nakazawa, M. Yoshida, T. Hirooka

    International Symposium on Extremely Advanced Transmission Technology (EXAT 2013)　pp. 60-pp.63　2013/11

  243. Investigation of the Influence of Fusion Splice on Crosstalk Properties of Multicore Fiber Peer-reviewed

    K. Imamura, R. Sugizaki, T. Yagi, M. Yoshida, M. Nakazawa

    IWCS 2013　P-1　2013/11

  244. Disaster-resilient networks and optical communication technologies Invited Peer-reviewed

    M. Nakazawa

    Journal of the Institute of Electronics, Information and Communication Engineers　96　(10)　748-751　2013/10

  245. Exa-bit optical communication exploring by 3M scheme Invited Peer-reviewed

    M. Nakazawa

    18th Microoptics Conference (MOC’13)　Plenary Talk　2013/10

  246. 640 Gbaud (1.28 Tbit/s/ch) optical Nyquist pulse transmission over 525 km with substantial PMD tolerance Peer-reviewed

    Koudai Harako, Daiki Seya, Toshihiko Hirooka, Masataka Nakazawa

    Optics Express　21　(18)　21062-21075　2013/09/09

    Publisher: Optical Society of American (OSA)

    DOI： 10.1364/OE.21.021062 　

    ISSN： 1094-4087

  247. A single-channel 1.92 Tbit/s, 64 QAM coherent optical pulse transmission over 150 km using frequency-domain equalization Peer-reviewed

    David Odeke Otuya, Keisuke Kasai, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    OPTICS EXPRESS　21　(19)　22808-22816　2013/09

    DOI： 10.1364/OE.21.022808 　

    ISSN： 1094-4087

  248. 1 Tbit/s 256 QAM-OFDM transmission over 560 km with 14.3 bit/s/Hz spectral efficiency Peer-reviewed

    T. Omiya, M. Yoshida, M. Nakazawa

    OECC2013　MR1-2　2013/07

  249. Resilient Photonic Network Architecture with Plug & play Optical Interconnection Technology Peer-reviewed

    T. Sakano, H. Kubota, T. Komukai, T. Hirooka, M. Nakazawa

    OECC2013　TuQ3-5　2013/07

  250. A Single-Channel 1.92 Tbit/s, 64 QAM Coherent Pulse OTDM Transmission over 150 km Peer-reviewed

    D. O. Otuya, K. Kasai, T. Hirooka, M. Yoshida, M. Nakazawa

    OECC2013　WR2-2　2013/07

  251. Marked Reduction of Depolarization-Induced Crosstalk in Ultrahigh-Speed Pol-MUX Transmission with an Optical Nyquist Pulse Peer-reviewed

    K. Harako, T. Hirooka, M. Nakazawa

    OECC2013　WR4-5　2013/07

  252. Orthogonal TDM Using Optical Nyquist Pulses Invited Peer-reviewed

    T. Hirooka, M. Nakazawa

    Signal Processing in Photonic Communications (SPPCom 2013)　SPM1D.3　2013/07

  253. Extremely Higher-Order Modulation Formats Peer-reviewed

    Masataka Nakazawa, Toshihiko Hirooka, Masato Yoshida, Keisuke Kasai

    Optical Fiber Telecommunications VIB: Systems and Networks: Sixth Edition　297-336　2013/05/13

    Publisher: Elsevier Inc.

    DOI： 10.1016/B978-0-12-396960-6.00007-9 　

  254. 400 Gbit/s 256 QAM-OFDM Transmission over 720 km with a 14 bit/s/Hz Spectral Efficiency Using an Improved FDE Technique Peer-reviewed

    T. Omiya, M. Yoshida, M. Nakazawa

    Optical Fiber Communication Conference (OFC2013)　OTh4E.1　2013/03

  255. Multicore EDFA for DWDM transmission in full c-band Peer-reviewed

    Y. Tsuchida, K. Maeda, K. Watanabe, T. Ito, K. Fukuchi, M. Yoshida, Y. Mimura, R. Sugizaki, M. Nakazawa

    Optical Fiber Communication Conference (OFC2013)　JW2A.16　2013/03

  256. 400 Gbit/s 256 QAM-OFDM transmission over 720 km with a 14 bit/s/Hz spectral efficiency by using high-resolution FDE Peer-reviewed

    Tatsunori Omiya, Masato Yoshida, Masataka Nakazawa

    OPTICS EXPRESS　21　(3)　2632-2641　2013/02

    DOI： 10.1364/OE.21.002632 　

    ISSN： 1094-4087

  257. 160 Gbit/s-300 km single-channel transmission in the 1.1 mu m band with a precise GVD and slope compensation Peer-reviewed

    Kengo Koizumi, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    OPTICS EXPRESS　21　(4)　4303-4310　2013/02

    DOI： 10.1364/OE.21.004303 　

    ISSN： 1094-4087

  258. A 1.5 µm Passively Mode-locked Fiber Soliton Laser with a Graphene-doped PVA Saturable Absorber

    Tohoku-Section Joint Convention Record of Institutes of Electrical and Information Engineers, Japan　2013　(0)　23-23　2013

    Publisher: Organizing Committee of Tohoku-Section Joint Convention of Institutes of Electrical and Information Engineers, Japan

    DOI： 10.11528/tsjc.2013.0_23 　

  259. Second-order PMD-induced crosstalk between polarization-multiplexed signals and its impact on ultrashort optical pulse transmission Peer-reviewed

    Toshihiko Hirooka, Koudai Harako, Pengyu Guan, Masataka Nakazawa

    Journal of Lightwave Technology　31　(5)　809-814　2013

    DOI： 10.1109/JLT.2012.2236884 　

    ISSN： 0733-8724

  260. An LD-Based Ultra-Low Phase Noise OPLL Circuit Using an Optical Voltage Controlled Oscillator Peer-reviewed

    Keisuke Kasai, Yixin Wang, Masataka Nakazawa

    2013 OPTICAL FIBER COMMUNICATION CONFERENCE AND EXPOSITION AND THE NATIONAL FIBER OPTIC ENGINEERS CONFERENCE (OFC/NFOEC)　OW3D.2　2013

  261. A Single-Channel, 1.6 Tbit/s 32 QAM Coherent Pulse Transmission Over 150 km With RZ-CW Conversion and FDE Techniques Peer-reviewed

    David Odeke Otuya, Keisuke Kasai, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa, Tokutaka Hara, Satoshi Oikawa

    2013 OPTICAL FIBER COMMUNICATION CONFERENCE AND EXPOSITION AND THE NATIONAL FIBER OPTIC ENGINEERS CONFERENCE (OFC/NFOEC)　OTh4E.4　2013

  262. Large PMD Tolerant 1.28 Tbit/s/ch Transmission over 525 km with 640 Gbaud Optical Nyquist Pulses Peer-reviewed

    Koudai Harako, Peng Ruan, Toshihiko Hirooka, Masataka Nakazawa

    2013 OPTICAL FIBER COMMUNICATION CONFERENCE AND EXPOSITION AND THE NATIONAL FIBER OPTIC ENGINEERS CONFERENCE (OFC/NFOEC)　JW2A.38　2013

  263. Generation of 9 W, 4 kHz linewidth (C2H2)-C-13 frequency-stabilized fiber laser output with core pumped erbium-doped amplifier Peer-reviewed

    Akira Fujisaki, Keisuke Kasai, Masato Yoshida, Toshihiko Hirooka, and Masataka Nakazawa

    2013 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)　CW3M.1　2013

    ISSN： 2160-9020

  264. Measurement of Structural Irregularity Dependence on Mode Coupling along Multi-Core Fiber Using Multi-Channel OTDR System Peer-reviewed

    Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa, Katsunori Imamura, Ryuichi Sugizaki, Takeshi Yagi

    2013 IEEE PHOTONICS SOCIETY SUMMER TOPICAL MEETING SERIES　84-+　2013

    DOI： 10.1109/PHOSST.2013.6614464 　

  265. Disaster-resilient networking: A new vision based on movable and deployable resource units Peer-reviewed

    Toshikazu Sakano, Zubair Fadlullah, Thuan Ngo, Hiroki Nishiyama, Masataka Nakazawa, Fumiyuki Adachi, Nei Kato, Atsushi Takahara, Tomoaki Kumagai, Hiromichi Kasahara, Shigeki Kurihara

    IEEE Network　27　(4)　40-46　2013

    DOI： 10.1109/MNET.2013.6574664 　

    ISSN： 0890-8044

  266. Dynamic optical transport connection with a 100 Gbit/s digital coherent optical transponder for disaster-resilient networking Peer-reviewed

    Toshihiko Hirooka, Masataka Nakazawa, Hirokazu Kubota, Tetsuro Komukai, Toshikazu Sakano

    2013 IEEE Region 10 Humanitarian Technology Conference, R10-HTC 2013　261-263　2013

    DOI： 10.1109/R10-HTC.2013.6669052 　

  267. 120 Gbit/s, 64 QAM coherent transmission employing an optical voltage controlled oscillator Peer-reviewed

    Yixin Wang, Keisuke Kasai, Tatsunori Omiya, Masataka Nakazawa

    IET Conference Publications　2013　(622)　110-112　2013

    DOI： 10.1049/cp.2013.1309 　

  268. Single-channel 1.28 Tbit/s transmission over 58 km in the 1.1 μm band with wideband GVD and dispersion slope compensation Peer-reviewed

    Kengo Koizumi, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa

    IET Conference Publications　2013　(622)　615-617　2013

    DOI： 10.1049/cp.2013.1478 　

  269. 512 QAM transmission over 240 km using frequency-domain equalization in a digital coherent receiver Peer-reviewed

    Yuki Koizumi, Kazushi Toyoda, Tatsunori Omiya, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    OPTICS EXPRESS　20　(21)　23383-23389　2012/10

    DOI： 10.1364/OE.20.023383 　

    ISSN： 1094-4087

  270. A 31 mW, 280 fs passively mode-locked fiber soliton laser using a high heat-resistant SWNT/P3HT saturable absorber coated with siloxane Peer-reviewed

    Takato Ono, Yuichiro Hori, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa, Junji Mata, Jun Tsukamoto

    OPTICS EXPRESS　20　(21)　23659-23665　2012/10

    DOI： 10.1364/OE.20.023659 　

    ISSN： 1094-4087

  271. Marked performance improvement of 256 QAM transmission using a digital back-propagation method Peer-reviewed

    Kazushi Toyoda, Yuki Koizumi, Tatsunori Omiya, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    OPTICS EXPRESS　20　(18)　19815-19821　2012/08

    DOI： 10.1364/OE.20.019815 　

    ISSN： 1094-4087

  272. Linear and nonlinear propagation of optical Nyquist pulses in fibers Peer-reviewed

    Toshihiko Hirooka, Masataka Nakazawa

    OPTICS EXPRESS　20　(18)　19836-19849　2012/08

    DOI： 10.1364/OE.20.019836 　

    ISSN： 1094-4087

  273. Highly dispersion-tolerant 160 Gbaud optical Nyquist pulse TDM transmission over 525 km Peer-reviewed

    Toshihiko Hirooka, Peng Ruan, Pengyu Guan, Masataka Nakazawa

    OPTICS EXPRESS　20　(14)　15001-15007　2012/07

    DOI： 10.1364/OE.20.015001 　

    ISSN： 1094-4087

  274. 1024 QAM (60 Gbit/s) single-carrier coherent optical transmission over 150 km Peer-reviewed

    Yuki Koizumi, Kazushi Toyoda, Masato Yoshida, Masataka Nakazawa

    OPTICS EXPRESS　20　(11)　12508-12514　2012/05

    DOI： 10.1364/OE.20.012508 　

    ISSN： 1094-4087

  275. Nondestructive measurement of mode couplings along a multi-core fiber using a synchronous multi-channel OTDR Peer-reviewed

    Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka

    OPTICS EXPRESS　20　(11)　12530-12540　2012/05

    DOI： 10.1364/OE.20.012530 　

    ISSN： 1094-4087

  276. Single-Carrier 800-Gb/s 32 RZ/QAM Coherent Transmission Over 225 km Employing a Novel RZ-CW Conversion Technique Peer-reviewed

    Keisuke Kasai, David Odeke Otuya, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　24　(5)　416-418　2012/03

    DOI： 10.1109/LPT.2011.2180373 　

    ISSN： 1041-1135

    eISSN： 1941-0174

  277. 64 QAM real-time coherent transmission using FPGA-based receiver Peer-reviewed

    M. Yoshida, T. Omiya, K. Kasai, M. Nakazawa

    IEICE Trans. Comm.　J95-B　(3)　405-413　2012/03

    ISSN： 1344-4697

  278. Extremely Advanced Transmission with 3M Technologies (Multi-level Modulation, Multi-core & Multi-mode) Invited Peer-reviewed

    M. Nakazawa

    Optical Fiber Communication Conference (OFC2012)　OTu1D.1　2012/03

  279. Measurement of Mode Couplings along a Multi-Core Fiber Using a Multi-Channel OTDR Peer-reviewed

    M. Nakazawa, M. Yoshida, T. Hirooka

    Optical Fiber Communication Conference (OFC2012)　OTh3I.3　2012/03

  280. Bandwidth and distance dependences of depolarization-induced crosstalk in polarization-multiplexed transmission Peer-reviewed

    T. Hirooka, K. Harako, P. Guan, M. Nakazawa

    Optical Fiber Communication Conference (OFC2012)　JW2A.44　2012/03

  281. 400 Gbit/s Frequency-Division-Multiplexed and Polarization-Multiplexed 256 QAM-OFDM Transmission over 400 km with a Spectral Efficiency of 14 bit/s/Hz Peer-reviewed

    T. Omiya, K. Toyoda, M. Yoshida, M. Nakazawa

    Optical Fiber Communication Conference (OFC2012)　OM2A.7　2012/03

  282. 1.6 Tbit/s, Single-carrier 32 RZ/QAM Coherent Transmission Over 150 km Utilizing an RZ-CW Conversion Scheme

    Otuya David Odeke

    Tohoku-Section Joint Convention Record of Institutes of Electrical and Information Engineers, Japan　2012　12-12　2012

    Publisher: Organizing Committee of Tohoku-Section Joint Convention of Institutes of Electrical and Information Engineers, Japan

    DOI： 10.11528/tsjc.2012.0_12 　

  283. Ultrahigh-speed "orthogonal" TDM transmission with an optical Nyquist pulse train Peer-reviewed

    Masataka Nakazawa, Toshihiko Hirooka, Peng Ruan, Pengyu Guan

    OPTICS EXPRESS　20　(2)　1129-1140　2012/01

    DOI： 10.1364/OE.20.001129 　

    ISSN： 1094-4087

  284. Ultrafast Coherent Optical Transmission Invited Peer-reviewed

    Masataka Nakazawa, Toshihiko Hirooka, Masato Yoshida, Keisuke Kasai

    IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS　18　(1)　363-376　2012/01

    DOI： 10.1109/JSTQE.2011.2125781 　

    ISSN： 1077-260X

    eISSN： 1558-4542

  285. Low Loss Photonic Crystal Fiber Fabricated by Slurry Casting Method Invited Peer-reviewed

    Tamotsu Yajima, Jun Yamamoto, Futoshi Ishii, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa

    2012 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)　CTh3G.1　2012

    ISSN： 2160-9020

  286. Preparation for ultrahigh-capacity SDM transmission Invited Peer-reviewed

    Masataka Nakazawa

    2012 IEEE Photonics Society Summer Topical Meeting Series, PSST 2012　171-172　2012

    DOI： 10.1109/PHOSST.2012.6280718 　

  287. A Cesium optical atomic clock with high optical frequency stability Peer-reviewed

    Kazunari Tokuhira, Fumitaka Suzuki, Masato Yoshida, Masataka Nakazawa

    IEICE ELECTRONICS EXPRESS　9　(18)　1496-1503　2012

    DOI： 10.1587/elex.9.1496 　

    ISSN： 1349-2543

  288. Low Loss Photonic Crystal Fiber Fabricated by Slurry Casting Method Peer-reviewed

    Tamotsu Yajima, Jun Yamamoto, Futoshi Ishii, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa

    2012 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)　21　(25)　30500-30506　2012

    DOI： 10.1364/OE.21.030500 　

    ISSN： 2160-9020

  289. 10 GHz, 1.1 ps optical pulse generation from a regeneratively mode-locked Yb fiber laser in the 1.1 mu m band Peer-reviewed

    Kengo Koizumi, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    OPTICS EXPRESS　19　(25)　25426-25432　2011/12

    DOI： 10.1364/OE.19.025426 　

    ISSN： 1094-4087

  290. 2.56 Tbit/s/ch polarization-multiplexed DQPSK transmission over 300 km using time-domain optical Fourier transformation Peer-reviewed

    Pengyu Guan, Toshiyuki Hirano, Koudai Harako, Yutaro Tomiyama, Toshihiko Hirooka, Masataka Nakazawa

    OPTICS EXPRESS　19　(26)　567-573　2011/12

    DOI： 10.1364/OE.19.00B567 　

    ISSN： 1094-4087

  291. PMD-Induced Crosstalk in Ultrahigh-Speed Polarization-Multiplexed Optical Transmission in the Presence of PDL Peer-reviewed

    Toshihiko Hirooka, Toshiyuki Hirano, Yutaro Tomiyama, Pengyu Guan, Masataka Nakazawa

    JOURNAL OF LIGHTWAVE TECHNOLOGY　29　(19)　2963-2970　2011/10

    DOI： 10.1109/JLT.2011.2163617 　

    ISSN： 0733-8724

  292. Comparison between polarization-multiplexed DPSK and single-polarization DQPSK in 640 Gbaud, 1.28 Tbit/s-500 km single-channel transmission Invited Peer-reviewed

    Yutaro Tomiyama, Koudai Harako, Pengyu Guan, Toshihiko Hirooka, Masataka Nakazawa

    OPTICAL FIBER TECHNOLOGY　17　(5)　439-444　2011/10

    DOI： 10.1016/j.yofte.2011.07.007 　

    ISSN： 1068-5200

  293. “Multi” is everywhere Invited Peer-reviewed

    M. Nakazawa

    Chitose International Forum on Photonics Science & Technology　2011/10

  294. CNT-based mode-locked lasers Invited Peer-reviewed

    M. Nakazawa

    17th Microoptics Conference (MOC’11)　E-2　2011/10

  295. Absolutely optical-frequency-stabilized cesium optical atomic clock Peer-reviewed

    M. Yoshida, F. Suzuki, T. Morisaki, M. Nakazawa

    17th Microoptics Conference (MOC’11)　B-2　2011/10

  296. Absolute frequency stabilization of a laser diode based on triple ring resonators to an C2H2 absorption line Peer-reviewed

    K. Kasai, M. Nakazawa, H. Yamazaki

    17th Microoptics Conference (MOC’11)　G-4　2011/10

  297. 10 GHz, 1.1 ps pulse generation from a harmonically and regeneratively mode-locked Yb fiber laser at 1.1 μm Peer-reviewed

    K. Koizumi, M. Yoshida, T. Hirooka, M. Nakazawa

    17th Microoptics Conference (MOC’11)　H-22　2011/10

  298. 1070 nm passively mode-locked ytterbium-doped fiber solition laser with SWNT/PMMA saturable absorber Peer-reviewed

    Y. Hori, Z. Zhang, M. Nakazawa

    17th Microoptics Conference (MOC’11)　H-18　2011/10

  299. Introduction

    NAKAZAWA Masataka

    IEEJ Transactions on Sensors and Micromachines　131　(9)　596-597　2011/09/01

    Publisher: The Institute of Electrical Engineers of Japan

    DOI： 10.1541/ieejjournal.131.596 　

    ISSN： 1340-5551

    More details Close

    This article has no abstract.

  300. Polarization-multiplexed, 10 Gsymbol/s, 64 QAM coherent transmission over 150 km with OPLL-based homodyne detection employing narrow linewidth LDs Peer-reviewed

    Yixin Wang, Keisuke Kasai, Masataka Nakazawa

    IEICE ELECTRONICS EXPRESS　8　(17)　1444-1449　2011/09

    DOI： 10.1587/elex.8.1444 　

    ISSN： 1349-2543

  301. Ultra high capacity optical fiber transmission technologies Peer-reviewed

    K. Fukuchi, M. Nakazawa

    IEEJ Journal　131　(9)　611-613　2011/09

    Publisher: The Institute of Electrical Engineers of Japan

    DOI： 10.1541/ieejjournal.131.611 　

    ISSN： 1340-5551

    More details Close

    This article has no abstract.

  302. Novel RZ-CW Conversion Scheme for Ultra Multi-level, High-speed Coherent OTDM Transmission Peer-reviewed

    M. Nakazawa, K. Kasai, M. Yoshida, T. Hirooka

    European Conference on Optical Communication (ECOC2011)　We.10.P1.75　2011/09

  303. 1.5-mu m Frequency-Stabilized lambda/4-Shifted DFB LD Employing an External Fiber Ring Cavity With a Linewidth of 2.6 kHz and an RIN of-135 dB/Hz Peer-reviewed

    Keisuke Kasai, Anne Mori, Masataka Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　23　(15)　1046-1048　2011/08

    DOI： 10.1109/LPT.2011.2150211 　

    ISSN： 1041-1135

  304. “Multi” is everywhere Invited Peer-reviewed

    M. Nakazawa

    Korea-Japan Workshop on Beyond 100G　2011/06

  305. Recent Progress on Ultra-high Speed and Multi Level Coherent Transmission Invited Peer-reviewed

    T. Hirooka, K. Kasai, M. Nakazawa

    Korea-Japan Workshop on Beyond 100G　2011/06

  306. Science and technology challenges in XXIst century optical communications Invited Peer-reviewed

    E. Desurvire, C. Kazmierski, F. Lelarge, X. Marcadet, Andre Scavennec, F. A. Kish, D. F. Welch, R. Nagarajan, C. H. Joyner, R. P. Schneider, S. W. Corzine, M. Kato, P. W. Evans, M. Ziari, A. G. Dentai, J. L. Pleumeekers, R. Muthiah, S. Bigo, M. Nakazawa, D. J. Richardson, F. Poletti, M. N. Petrovich, S. U. Alam, W. H. Loh, D. N. Payne

    COMPTES RENDUS PHYSIQUE　12　(4)　387-416　2011/05

    DOI： 10.1016/j.crhy.2011.04.009 　

    ISSN： 1631-0705

    eISSN： 1878-1535

  307. 256 QAM Digital Coherent Optical Transmission Using Raman Amplifiers Peer-reviewed

    Masato Yoshida, Seiji Okamoto, Tatsunori Omiya, Keisuke Kasai, Masataka Nakazawa

    IEICE TRANSACTIONS ON COMMUNICATIONS　E94B　(2)　417-424　2011/02

    DOI： 10.1587/transcom.E94.B.417 　

    ISSN： 0916-8516

    eISSN： 1745-1345

  308. Single-Channel 1.28 Tbit/s-525 km DQPSK Transmission Using Ultrafast Time-Domain Optical Fourier Transformation and Nonlinear Optical Loop Mirror Peer-reviewed

    Pengyu Guan, Hans Christian Hansen Mulvad, Yutaro Tomiyama, Toshiyuki Hirano, Toshihiko Hirooka, Masataka Nakazawa

    IEICE TRANSACTIONS ON COMMUNICATIONS　E94B　(2)　430-436　2011/02

    DOI： 10.1587/transcom.E94.B.430 　

    ISSN： 0916-8516

    eISSN： 1745-1345

  309. A 13C2H2 frequency-stabilized λ/4-shifted dfb laser diode with an external fiber ring cavity having a linewidth of 2.6 kHz and a RIN of-135 dB/Hz

    Keisuke Kasai, Anne Mori, Masataka Nakazawa

    Optics InfoBase Conference Papers　2011

    ISSN： 2162-2701

  310. A precise OPLL circuit employing narrow linewidth LDs and its application to coherent optical QAM transmission

    Tohoku-Section Joint Convention Record of Institutes of Electrical and Information Engineers, Japan　2011　22-22　2011

    Publisher: Organizing Committee of Tohoku-Section Joint Convention of Institutes of Electrical and Information Engineers, Japan

    DOI： 10.11528/tsjc.2011.0_22 　

  311. 2.56 Tbit/s/ch Polarization-Multiplexed DQPSK Transmission over 300 km Using Time-Domain Optical Fourier Transformation Peer-reviewed

    Pengyu Guan, Toshiyuki Hirano, Koudai Harako, Yutaro Tomiyama, Toshihiko Hirooka, Masataka Nakazawa

    2011 37TH EUROPEAN CONFERENCE AND EXHIBITION ON OPTICAL COMMUNICATIONS (ECOC 2011)　2011

  312. Investigation and comparison of digital backward propagation schemes for OFDM and single-carrier fiber-optic transmission systems Peer-reviewed

    Dong Yang, Shiva Kumar, M. Nakazawa

    OPTICAL FIBER TECHNOLOGY　17　(1)　84-90　2011/01

    DOI： 10.1016/j.yofte.2010.11.001 　

    ISSN： 1068-5200

  313. Real-time FPGA-based Coherent Optical Receiver for 1 Gsymbol/s, 64 QAM Transmission Peer-reviewed

    Masato Yoshida, Tatsunori Omiya, Keisuke Kasai, Masataka Nakazawa

    2011 OPTICAL FIBER COMMUNICATION CONFERENCE AND EXPOSITION (OFC/NFOEC) AND THE NATIONAL FIBER OPTIC ENGINEERS CONFERENCE　OTuN3　2011

  314. New PMD-Induced Crosstalk in the Presence of PDL in a Polarization-Multiplexed Ultrahigh-Speed Transmission Peer-reviewed

    Toshihiko Hirooka, Toshiyuki Hirano, Pengyu Guan, Masataka Nakazawa

    2011 OPTICAL FIBER COMMUNICATION CONFERENCE AND EXPOSITION (OFC/NFOEC) AND THE NATIONAL FIBER OPTIC ENGINEERS CONFERENCE　JThA44　2011

  315. Ultrafast and High-Spectral-Density Optical Communications Systems Invited Peer-reviewed

    Masataka Nakazawa

    2011 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)　CThGG3　2011

    ISSN： 2160-9020

  316. A (C2H2)-C-13 Frequency-Stabilized lambda/4-shifted DFB Laser Diode with an External Fiber Ring Cavity Having a Linewidth of 2.6 kHz and a RIN of-135 dB/Hz Peer-reviewed

    Keisuke Kasai, Anne Mori, Masataka Nakazawa

    2011 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)　CTuV4　2011

    ISSN： 2160-9020

  317. A 10 GHz 2.5 ps Regeneratively Mode-Locked Yb Fiber Laser in the 1.1 mu m Band Peer-reviewed

    Kengo Koizumi, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    2011 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)　CMBB3　2011

    ISSN： 2160-9020

  318. Novel RZ-CW Conversion Scheme for Ultra Multi-Level, High-Speed Coherent OTDM Transmission Peer-reviewed

    Masataka Nakazawa, Keisuke Kasai, Masato Yoshida, Toshihiko Hirooka

    2011 37TH EUROPEAN CONFERENCE AND EXHIBITION ON OPTICAL COMMUNICATIONS (ECOC 2011)　19　(26)　B574-B580　2011

  319. High Time-Resolution 640-Gb/s Clock Recovery Using Time-Domain Optical Fourier Transformation and Narrowband Optical Filter Peer-reviewed

    Pengyu Guan, Hans Christian Hansen Mulvad, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　22　(23)　1735-1737　2010/12

    DOI： 10.1109/LPT.2010.2083644 　

    ISSN： 1041-1135

  320. Recent progress on ultra-high speed and multi level coherent transmission Invited Peer-reviewed

    T. Hirooka, M. Nakazawa

    Photonics 2010　M2B3　2010/12

  321. Optical frequency-tunable Cs atomic clock with a 9.19GHz mode-hop-free fiber laser Peer-reviewed

    Takahito Morisaki, Masato Yoshida, Masataka Nakazawa

    IEICE ELECTRONICS EXPRESS　7　(21)　1652-1658　2010/11

    DOI： 10.1587/elex.7.1652 　

    ISSN： 1349-2543

  322. Real time monitoring of a fiber fuse using an optical time-domain reflectometer Peer-reviewed

    Kazi S. Abedin, Masataka Nakazawa

    OPTICS EXPRESS　18　(20)　21315-21321　2010/09

    DOI： 10.1364/OE.18.021315 　

    ISSN： 1094-4087

  323. Giant leaps in optical communication technologies towards 2030 and beyond Invited Peer-reviewed

    M. Nakazawa

    European Conference on Optical Communication (ECOC 2010)　Plenary Talk　2010/09

  324. 60Gbit/s 64 QAM-OFDM coherent optical transmission with a 5.3GHz bandwidth Peer-reviewed

    Tatsunori Omiya, Seiji Okamoto, Keisuke Kasai, Masato Yoshida, Masataka Nakazawa

    IEICE ELECTRONICS EXPRESS　7　(15)　1163-1168　2010/08

    DOI： 10.1587/elex.7.1163 　

    ISSN： 1349-2543

  325. 640-Gb/s/Channel Single-Polarization DPSK Transmission Over 525 km With Ultrafast Time-Domain Optical Fourier Transformation Peer-reviewed

    Toshiyuki Hirano, Pengyu Guan, Toshihiko Hirooka, Masataka Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　22　(14)　1042-1044　2010/07

    DOI： 10.1109/LPT.2010.2049483 　

    ISSN： 1041-1135

    eISSN： 1941-0174

  326. Hardware paradigm shifts in the optical communication infrastructure with three “M technologies Invited Peer-reviewed

    M. Nakazawa

    Opto Electronics and Communications Conference (OECC 2010)　Plenary Talk　2010/07

  327. Advances in information communication technology lased on lasers Invited Peer-reviewed

    M. Nakazawa

    Journal of Applied Physics (Oyo Butsuri)　79　(6)　508-516　2010/06

  328. 131 fs, 33 MHz all-fiber soliton laser at 1.07 mu m with a film-type SWNT saturable absorber coated on polyimide Peer-reviewed

    Fumio Shohda, Yuichiro Hori, Masataka Nakazawa, Junji Mata, Jun Tsukamoto

    OPTICS EXPRESS　18　(11)　11223-11229　2010/05

    DOI： 10.1364/OE.18.011223 　

    ISSN： 1094-4087

  329. Single-Channel 400-Gb/s OTDM-32 RZ/QAM Coherent Transmission Over 225 km Using an Optical Phase-Locked Loop Technique Peer-reviewed

    Keisuke Kasai, Tatsunori Omiya, Pengyu Guan, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　22　(8)　562-564　2010/04

    DOI： 10.1109/LPT.2010.2042708 　

    ISSN： 1041-1135

  330. A 113 fs fiber laser operating at 1.56 mu m using a cascadable film-type saturable absorber with P3HT-incorporated single-wall carbon nanotubes coated on polyamide Peer-reviewed

    Fumio Shohda, Masataka Nakazawa, Junji Mata, Jun Tsukamoto

    OPTICS EXPRESS　18　(9)　9712-9721　2010/04

    DOI： 10.1364/OE.18.009712 　

    ISSN： 1094-4087

  331. Device requirements for next generation optical transmission technology Invited Peer-reviewed

    M. Nakazawa

    European Conference on Integrated Optics (ECIO2010)　FrC1　2010/04

  332. A 10-GHz Optoelectronic Oscillator at 1.1 mu m Using a Single-Mode VCSEL and a Photonic Crystal Fiber Peer-reviewed

    Kengo Koizumi, Masato Yoshida, Masataka Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　22　(5)　293-295　2010/03

    DOI： 10.1109/LPT.2009.2038892 　

    ISSN： 1041-1135

  333. 256-QAM (64 Gb/s) Coherent Optical Transmission Over 160 km With an Optical Bandwidth of 5.4 GHz Peer-reviewed

    Masataka Nakazawa, Seiji Okamoto, Tatsunori Omiya, Keisuke Kasai, Masato Yoshida

    IEEE PHOTONICS TECHNOLOGY LETTERS　22　(3)　185-187　2010/02

    DOI： 10.1109/LPT.2009.2037238 　

    ISSN： 1041-1135

  334. Recent progress on OTDM terabit/s transmission and their future

    Toshihiko Hirooka, M. Nakazawa, M. Yoshida, K. Kasai, P. Guan, T. Hirano

    2010 Conference on Optical Fiber Communication, Collocated National Fiber Optic Engineers Conference, OFC/NFOEC 2010　2010

  335. An 88 fs Fiber Soliton Laser at 1.56 mu m using a Quantum Well Saturable Absorber with an Ultrafast Intersubband Transition Peer-reviewed

    Fumio Shohda, Masataka Nakazawa, Ryoichi Akimoto, Hiroshi Ishikawa

    2010 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) AND QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE (QELS)　17　(25)　22499-22504　2010

    DOI： 10.1364/OE.17.022499 　

  336. A 10 GHz Opto-electronic Oscillator at 1.1 mu m Using a Gain-Switched InGaAs VCSEL and a Photonic Crystal Fiber Peer-reviewed

    Kengo Koizumi, Masato Yoshida, Masataka Nakazawa

    2010 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) AND QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE (QELS)　22　(5)　293-295　2010

    DOI： 10.1109/LPT.2009.2038892 　

  337. Recent progress on ultrafast/ultrashort/frequency-stabilized erbium-doped fiber lasers and their applications Invited Peer-reviewed

    Masataka Nakazawa

    Frontiers of Optoelectronics in China　3　(1)　38-44　2010

    DOI： 10.1007/s12200-009-0085-x 　

    ISSN： 1674-4128 1674-4594

  338. 256 QAM (64 Gbit/s) Coherent Optical Transmission over 160 km with an Optical Bandwidth of 5.4 GHz Peer-reviewed

    Masataka Nakazawa, Seiji Okamoto, Tatsunori Omiya, Keisuke Kasai, Masato Yoshida

    2010 CONFERENCE ON OPTICAL FIBER COMMUNICATION OFC COLLOCATED NATIONAL FIBER OPTIC ENGINEERS CONFERENCE OFC-NFOEC　OMJ5　2010

  339. 140 Gbit/s Coherent Optical Transmission over 150 km with a 10 Gsymbol/s Polarization-Multiplexed 128 QAM Signal Peer-reviewed

    Seiji Okamoto, Tatsunori Omiya, Keisuke Kasai, Masato Yoshida, Masataka Nakazawa

    2010 CONFERENCE ON OPTICAL FIBER COMMUNICATION OFC COLLOCATED NATIONAL FIBER OPTIC ENGINEERS CONFERENCE OFC-NFOEC　OThD5　2010

  340. Single-Channel 400 Gbit/s, OTDM-32 RZ/QAM Coherent Transmission Over 225 km Using an Optical Phase-Locked Loop Technique Peer-reviewed

    Keisuke Kasai, Tatsunori Omiya, Pengyu Guan, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    2010 CONFERENCE ON OPTICAL FIBER COMMUNICATION OFC COLLOCATED NATIONAL FIBER OPTIC ENGINEERS CONFERENCE OFC-NFOEC　OThD6　2010

  341. 640 Gbit/s Single-Polarization DPSK Transmission over 525 km with Time-Domain Optical Fourier Transformation in a Round-Trip Configuration Peer-reviewed

    Toshiyuki Hirano, Pengyu Guan, Toshihiko Hirooka, Masataka Nakazawa

    2010 CONFERENCE ON OPTICAL FIBER COMMUNICATION OFC COLLOCATED NATIONAL FIBER OPTIC ENGINEERS CONFERENCE OFC-NFOEC　OThD7　2010

  342. 10 Gbit/s Photonic Crystal Fiber Transmissions with 1.1 mu m Directly-Modulated Single-Mode VCSEL Peer-reviewed

    Kengo Koizumi, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    2010 CONFERENCE ON OPTICAL FIBER COMMUNICATION OFC COLLOCATED NATIONAL FIBER OPTIC ENGINEERS CONFERENCE OFC-NFOEC　OWK3　2010

  343. A 10 GHz Opto-electronic Oscillator at 1.1 mu m Using a Gain-Switched InGaAs VCSEL and a Photonic Crystal Fiber Peer-reviewed

    Kengo Koizumi, Masato Yoshida, Masataka Nakazawa

    2010 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) AND QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE (QELS)　CMA7　2010

  344. Optical Frequency-Tunable Cs Atomic Clock with a Mode-Hop-Free Fiber Laser Peer-reviewed

    Takahito Morisaki, Masato Yoshida, Masataka Nakazawa

    2010 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) AND QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE (QELS)　CMN2　2010

  345. A C(2)H(2) Frequency-Stabilized Laser Diode with a Linewidth of 4 kHz and Its Application to an Optical Phase-Locked Loop Peer-reviewed

    Keisuke Kasai, Masataka Nakazawa

    2010 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) AND QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE (QELS)　CTuKK7　2010

  346. A Film-type Saturable Absorber with P3HT-incorporated Single-wall Carbon Nanotubes Coated on Polyamide and its Application to a Femtosecond Fiber Laser Peer-reviewed

    Fumio Shohda, Masataka Nakazawa, Junji Mata, Jun Tsukamoto

    2010 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) AND QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE (QELS)　JTuD52　2010

  347. An 88 fs Fiber Soliton Laser at 1.56 mu m using a Quantum Well Saturable Absorber with an Ultrafast Intersubband Transition Peer-reviewed

    Fumio Shohda, Masataka Nakazawa, Ryoichi Akimoto, Hiroshi Ishikawa

    2010 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) AND QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE (QELS)　JTuD60　2010

  348. High-Resolution 640 Gbit/s Clock Recovery using Time-Domain Optical Fourier Transformation and Narrowband Optical Filter Peer-reviewed

    H. C. Hansen Mulvad, P. Guan, K. Kasai, T. Hirooka, M. Nakazawa

    2010 36TH EUROPEAN CONFERENCE AND EXHIBITION ON OPTICAL COMMUNICATION (ECOC), VOLS 1 AND 2　Mo.1.A.6　2010

    DOI： 10.1109/ECOC.2010.5621124 　

  349. 1.28 Tbit/s/channel Single-polarization DQPSK Transmission over 525 km Using Ultrafast Time-domain Optical Fourier Transformation Peer-reviewed

    Pengyu Guan, Hans Christian Hansen Mulvad, Yutaro Tomiyama, Toshiyuki Hirano, Toshihiko Hirooka, Masataka Nakazawa

    2010 36TH EUROPEAN CONFERENCE AND EXHIBITION ON OPTICAL COMMUNICATION (ECOC), VOLS 1 AND 2　We.6.C.3　2010

    DOI： 10.1109/ECOC.2010.5621133 　

  350. 512 QAM (54 Gbit/s) Coherent Optical Transmission over 150 km with an Optical Bandwidth of 4.1 GHz Peer-reviewed

    Seiji Okamoto, Kazushi Toyoda, Tatsunori Omiya, Keisuke Kasai, Masato Yoshida, Masataka Nakazawa

    2010 36TH EUROPEAN CONFERENCE AND EXHIBITION ON OPTICAL COMMUNICATION (ECOC), VOLS 1 AND 2　PD2.3　2010

    DOI： 10.1109/ECOC.2010.5621378 　

  351. High-Resolution 640 Gbit/s Clock Recovery using Time-Domain Optical Fourier Transformation and Narrowband Optical Filter Peer-reviewed

    H. C. Hansen Mulvad, P. Guan, K. Kasai, T. Hirooka, M. Nakazawa

    2010 36TH EUROPEAN CONFERENCE AND EXHIBITION ON OPTICAL COMMUNICATION (ECOC), VOLS 1 AND 2　22　(23)　1735-1737　2010

    DOI： 10.1109/LPT.2010.2083644 　

  352. Low-Penalty 5 x 320 Gb/s/Single-Channel WDM DPSK Transmission Over 525 km Using Time-Domain Optical Fourier Transformation Peer-reviewed

    Pengyu Guan, Masatada Okazaki, Toshiyuki Hirano, Toshihiko Hirooka, Masataka Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　21　(21)　1579-1581　2009/11

    DOI： 10.1109/LPT.2009.2029074 　

    ISSN： 1041-1135

  353. 10-GHz 11.5-ps Pulse Generation From a Single-Mode Gain-Switched InGaAs VCSEL at 1.1 mu m Peer-reviewed

    Kengo Koizumi, Masato Yoshida, Masataka Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　21　(22)　1704-1706　2009/11

    DOI： 10.1109/LPT.2009.2031920 　

    ISSN： 1041-1135

  354. 10Gbit/s photonic crystal fiber transmissions with 1.1 mu m directly-modulated single-mode VCSEL Peer-reviewed

    Kengo Koizumi, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    IEICE ELECTRONICS EXPRESS　6　(22)　1615-1620　2009/11

    DOI： 10.1587/elex.6.1615 　

    ISSN： 1349-2543

  355. All-Optical Demultiplexing of 640-Gb/s OTDM-DPSK Signal Using a Semiconductor SMZ Switch Peer-reviewed

    Toshihiko Hirooka, Masatada Okazaki, Toshiyuki Hirano, Pengyu Guan, Masataka Nakazawa, Shigeru Nakamura

    IEEE PHOTONICS TECHNOLOGY LETTERS　21　(20)　1574-1576　2009/10

    DOI： 10.1109/LPT.2009.2029555 　

    ISSN： 1041-1135

    eISSN： 1941-0174

  356. Measurements of spectral broadening and Doppler shift of backreflections from a fiber fuse using heterodyne detection Peer-reviewed

    Kazi S. Abedin, Tetsuya Miyazaki, Masataka Nakazawa

    OPTICS LETTERS　34　(20)　3157-3159　2009/10

    DOI： 10.1364/OL.34.003157 　

    ISSN： 0146-9592

  357. 20 years of EDFA and future prospects Invited Peer-reviewed

    M. Nakazawa

    IEICE Transactions on Electronics　J92-C　(8)　339-359　2009/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 1345-2827

  358. FM-eliminated C2H2 frequency-stabilized laser diode with an RIN of-135 dB/Hz and a linewidth of 4 kHz Peer-reviewed

    Keisuke Kasai, Masataka Nakazawa

    OPTICS LETTERS　34　(14)　2225-2227　2009/07

    DOI： 10.1364/OL.34.002225 　

    ISSN： 0146-9592

  359. Recent progress on ultrafast/ultrashort/frequency-stabilized erbium-doped fiber lasers and their applications Invited Peer-reviewed

    M. Nakazawa

    International Conference on Materials for Advanced Technologies (ICMAT 2009)　P-S1.3-4　2009/06

  360. Backreflected radiation due to a propagating fiber fuse Peer-reviewed

    Kazi S. Abedin, Masataka Nakazawa, Tetsuya Miyazaki

    OPTICS EXPRESS　17　(8)　6525-6531　2009/04

    DOI： 10.1364/OE.17.006525 　

    ISSN： 1094-4087

  361. Environmentally stable, simple passively mode-locked fiber ring laser using a four-port circulator Peer-reviewed

    Shin Masuda, Shoji Niki, Masataka Nakazawa

    OPTICS EXPRESS　17　(8)　6613-6622　2009/04

    DOI： 10.1364/OE.17.006613 　

    ISSN： 1094-4087

  362. Ultra-multilevel coherent QAM optical transmission technology Peer-reviewed

    M. Nakazawa

    The Review of Laser Engineering　37　(3)　101-106　2009/03

  363. 147 fs, 51 MHz soliton fiber laser at 1.56 mu m with a fiber-connector-type SWNT/P3HT saturable absorber Invited Peer-reviewed

    Fumio Shohda, Takafumi Shirato, Masataka Nakazawa, Junji Mata, Jun Tsukamoto

    2009 CONFERENCE ON LASERS AND ELECTRO-OPTICS AND QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE (CLEO/QELS 2009), VOLS 1-5　16　(25)　542-+　2009

    DOI： 10.1364/OE.16.020943 　

  364. A passively mode-locked femtosecond soliton fiber laser at 1.5 mu m with a CNT-doped polycarbonate saturable absorber Invited Peer-reviewed

    Fumio Shohda, Takafumi Shirato, Masataka Nakazawa, Kyoji Komatsu, Toshikuni Kaino

    2009 CONFERENCE ON LASERS AND ELECTRO-OPTICS AND QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE (CLEO/QELS 2009), VOLS 1-5　16　(26)　538-+　2009

    DOI： 10.1364/OE.16.021191 　

  365. Optical Quadrature Amplitude Modulation (QAM) with Coherent Detection up to 128 States Peer-reviewed

    Masataka Nakazawa

    OFC: 2009 CONFERENCE ON OPTICAL FIBER COMMUNICATION, VOLS 1-5　1445-1447　2009

  366. A passively mode-locked femtosecond soliton fiber laser at 1.5 mu m with a CNT-doped polycarbonate saturable absorber Peer-reviewed

    Fumio Shohda, Takafumi Shirato, Masataka Nakazawa, Kyoji Komatsu, Toshikuni Kaino

    2009 CONFERENCE ON LASERS AND ELECTRO-OPTICS AND QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE (CLEO/QELS 2009), VOLS 1-5　538-+　2009

  367. 147 fs, 51 MHz soliton fiber laser at 1.56 mu m with a fiber-connector-type SWNT/P3HT saturable absorber Peer-reviewed

    Fumio Shohda, Takafumi Shirato, Masataka Nakazawa, Junji Mata, Jun Tsukamoto

    2009 CONFERENCE ON LASERS AND ELECTRO-OPTICS AND QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE (CLEO/QELS 2009), VOLS 1-5　542-+　2009

  368. C(2)H(2) absolutely optical frequency-stabilized and 40 GHz repetition-rate-stabilized, regeneratively mode-locked picosecond erbium fiber laser at 1.53 mu m Peer-reviewed

    Masataka Nakazawa, Masato Yoshida, Keisuke Kasai

    2009 CONFERENCE ON LASERS AND ELECTRO-OPTICS AND QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE (CLEO/QELS 2009), VOLS 1-5　771-772　2009

  369. Delivery of an ultrastable Cs optical atomic clock using a JGN II optical test bed Peer-reviewed

    Masato Yoshida, Ikuro Kashiwamura, Toshihiko Hirooka, Masataka Nakazawa

    2009 CONFERENCE ON LASERS AND ELECTRO-OPTICS AND QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE (CLEO/QELS 2009), VOLS 1-5　1557-1558　2009

  370. Ultrafast Transmission Technology using Time-Domain Optical Fourier Transformation Technique Invited Peer-reviewed

    Toshihiko Hirooka, Masataka Nakazawa

    2009 DIGEST OF THE LEOS SUMMER TOPICAL MEETINGS　73-74　2009

    DOI： 10.1109/LEOSST.2009.5226260 　

  371. 24 Gbit/s, 64 QAM-OFDM Coherent Transmission with a Bandwidth of 2.5 GHz Peer-reviewed

    Tatsunori Omiya, Hiroki Goto, Keisuke Kasai, Masato Yoshida, Masataka Nakazawa

    2009 35TH EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)　1.3.2　2009

  372. All-Optical Demultiplexing of 640 Gbit/s OTDM-DPSK Signal Using a Semiconductor SMZ Switch Peer-reviewed

    Toshihiko Hirooka, Masatada Okazaki, Toshiyuki Hirano, Pengyu Guan, Masataka Nakazawa, Shigeru Nakamura

    2009 35TH EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)　4.3.2　2009

  373. Low-penalty 5x320 Gbit/s (1.6 Tbit/s) WDM DPSK Transmission over 525 km Using Time-domain Optical Fourier Transformation Peer-reviewed

    Pengyu Guan, Masatada Okazaki, Toshiyuki Hirano, Toshihiko Hirooka, Masataka Nakazawa

    2009 35TH EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)　6.4.4　2009

  374. A passively mode-locked femtosecond soliton fiber laser at 1.5 mu m with a CNT-doped polycarbonate saturable absorber Peer-reviewed

    Fumio Shohda, Takafumi Shirato, Masataka Nakazawa, Kyoji Komatsu, Toshikuni Kaino

    OPTICS EXPRESS　16　(26)　21191-21198　2008/12

    DOI： 10.1364/OE.16.021191 　

    ISSN： 1094-4087

  375. 147 fs, 51 MHz soliton fiber laser at 1.56 mu m with a fiber-connector-type SWNT/P3HT saturable absorber Peer-reviewed

    Fumio Shohda, Takafumi Shirato, Masataka Nakazawa, Junji Mata, Jun Tsukamoto

    OPTICS EXPRESS　16　(25)　20943-20948　2008/12

    ISSN： 1094-4087

  376. All-Optical 40-GHz Time. Domain Fourier Transformation Using XPM With a Dark Parabolic Pulse Invited Peer-reviewed

    Toshihiko Hirooka, Masataka Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　20　(21-24)　1869-1871　2008/11

    DOI： 10.1109/LPT.2008.2004879 　

    ISSN： 1041-1135

  377. 320-Gb/s Single-Polarization DPSK Transmission Over 525 km Using Time-Domain Optical Fourier Transformation Invited Peer-reviewed

    Toshihiko Hirooka, Masatada Okazaki, Pengyu Guan, Masataka Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　20　(21-24)　1872-1874　2008/11

    DOI： 10.1109/LPT.2008.2004880 　

    ISSN： 1041-1135

  378. C2H2 absolutely optical frequency-stabilized and 40 GHz repetition-rate-stabilized, regeneratively mode-locked picosecond erbium fiber laser at 1.53 mu m Invited Peer-reviewed

    Masataka Nakazawa, Keisuke Kasai, Masato Yoshida

    OPTICS LETTERS　33　(22)　2641-2643　2008/11

    DOI： 10.1364/OL.33.002641 　

    ISSN： 0146-9592

  379. 160-Gb/s 200-km Field Transmission Experiment With Large PMD Using a Time-Domain Optical Fourier Transformation Technique Invited Peer-reviewed

    Masatada Okazaki, Pengyu Guan, Toshihiko Hirooka, Masataka Nakazawa, Tetsuya Miyazaki

    IEEE PHOTONICS TECHNOLOGY LETTERS　20　(21-24)　2192-2194　2008/11

    DOI： 10.1109/LPT.2008.2006407 　

    ISSN： 1041-1135

  380. Toward the Shannon limit optical communication Peer-reviewed

    M. Nakazawa

    OSA Annual Meeting, Fronters in Optics (FiO2008)　2008/10

  381. New scheme for independently stabilizing the repetition rate and optical frequency of a laser using a regenerative mode-locking technique Invited Peer-reviewed

    M. Nakazawa, M. Yoshida

    OSA Annual Meeting, Fronters in Optics (FiO2008)　2008/10

  382. A lambda/4-Shifted Distributed-Feedback Laser Diode With a Fiber Ring Cavity Configuration Having an OSNR of 85 dB and a Linewidth of 7 kHz Invited Peer-reviewed

    Ho Thi Quynhanh, Akihito Suzuki, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　20　(17-20)　1578-1580　2008/09

    DOI： 10.1109/LPT.2008.928848 　

    ISSN： 1041-1135

  383. Polarization and frequency division multiplexed 1Gsymbol/s, 64 QAM coherent optical transmission with 8.6bit/s/Hz spectral efficiency over 160km Invited Peer-reviewed

    Hiroki Goto, Masato Yoshida, Tatsunori Omiya, Keisuke Kasai, Masataka Nakazawa

    IEICE ELECTRONICS EXPRESS　5　(18)　776-781　2008/09

    DOI： 10.1587/elex.5.776 　

    ISSN： 1349-2543

  384. Optimized amplification of femtosecond optical pulses by dispersion management for octave-spanning optical frequency comb generation Invited Peer-reviewed

    Yoshiaki Nakajima, Hajime Inaba, Feng-Lei Hong, Atsushi Onae, Kaoru Minoshima, Takao Kobayashi, Masataka Nakazawa, Hirokazu Matsumoto

    OPTICS COMMUNICATIONS　281　(17)　4484-4487　2008/09

    DOI： 10.1016/j.optcom.2008.04.062 　

    ISSN： 0030-4018

  385. Stimulated Brillouin Scattering in Ultrahigh-Speed In-Phase RZ and CS-RZ OTDM Transmission Invited Peer-reviewed

    Toshihiko Hirooka, Kou Osawa, Masatada Okazaki, Masataka Nakazawa, Hitoshi Murai

    IEEE PHOTONICS TECHNOLOGY LETTERS　20　(17-20)　1694-1696　2008/09

    DOI： 10.1109/LPT.2008.2003407 　

    ISSN： 1041-1135

  386. A straight-line 160-Gb/s DPSK transmission over 1000 km with time-domain optical Fourier transformation Invited Peer-reviewed

    Toshihiko Hirooka, Masatada Okazaki, Masataka Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　20　(13-16)　1094-1096　2008/07

    DOI： 10.1109/LPT.2008.924303 　

    ISSN： 1041-1135

  387. Optical communication going ahead of wireless communication in terms of spectral efficiency Peer-reviewed

    M. Nakazawa

    Workshop on High Spectral Density Optical Communication for New Generation Network　2008/06

  388. Scheme for independently stabilizing the repetition rate and optical frequency of a laser using a regenerative mode-locking technique Invited Peer-reviewed

    Masataka Nakazawa, Masato Yoshida

    OPTICS LETTERS　33　(10)　1059-1061　2008/05

    DOI： 10.1364/OL.33.001059 　

    ISSN： 0146-9592

  389. Bright and dark 4 GHz parabolic pulse generation using a picosecond optical pulse train and an arrayed waveguide grating Invited Peer-reviewed

    Toshihiko Hirooka, Masataka Nakazawa, Katsunari Okamoto

    OPTICS LETTERS　33　(10)　1102-1104　2008/05

    DOI： 10.1364/OL.33.001102 　

    ISSN： 0146-9592

  390. 1.5 mm passively mode-locked femtosecond fiber laser with CNT-doped polymer saturable absorber Invited Peer-reviewed

    F. Shohda, T. Shirato, M. Nakazawa, K. Komatsu, T. Kaino

    International Laser, Light-Wave and Microwave Conference (ILLMC 2008)　2008/04

  391. 1.5 μm femtsecond fiber laser with CNT-doped polymer saturable absorber Invited Peer-reviewed

    M. Nakazawa

    The 8th International Mini-Symposium on Advanced Organic Photonics (ISAOP-8)　I-11　2008/02

  392. Frequency Division Multiplexed 1 Gsymbol/s, 64 QAM Coherent Optical Transmission with a Spectral Efficiency of 8.6 bit/s/Hz

    Masato Yoshida, Hiroki Goto, Tatsunori Omiya, Keisuke Kasai, Masataka Nakazawa

    2008 34TH EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)　2008

  393. Polarization-multiplexed 1 Gsymbol/s,128 QAM (14 Gbit/s) coherent optical transmission over 160 km with a 1.4 GHz bandwidth

    Tohoku-Section Joint Convention Record of Institutes of Electrical and Information Engineers, Japan　2008　(0)　45-45　2008

    Publisher: Organizing Committee of Tohoku-Section Joint Convention of Institutes of Electrical and Information Engineers, Japan

    DOI： 10.11528/tsjc.2008.0_45 　

  394. 1.3 GHz ultranarrow FBG optical filter with 20-dB side lobe suppression

    Tohoku-Section Joint Convention Record of Institutes of Electrical and Information Engineers, Japan　2008　(0)　46-46　2008

    Publisher: Organizing Committee of Tohoku-Section Joint Convention of Institutes of Electrical and Information Engineers, Japan

    DOI： 10.11528/tsjc.2008.0_46 　

  395. Challenges to FDM-QAM Coherent Transmission with Ultrahigh Spectral Efficiency Peer-reviewed

    Masataka Nakazawa

    2008 34TH EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)　2008

  396. Dispersion management of femtosecond pulse amplification for octave-spanning optical frequency comb generation Peer-reviewed

    Nakajima Y, Inaba H, Hong F.-L, Onae A, Minoshima K, Kobayashi T, Nakazawa M, Matsumoto H

    Advanced Solid-State Photonics, ASSP 2008　2008

  397. The use of a Nyquist filter for reducing an optical signal bandwidth in a coherent QAM optical transmission Peer-reviewed

    Keisuke Kasai, Jumpei Hongo, Hiroki Goto, Masato Yoshida, Masataka Nakazawa

    IEICE ELECTRONICS EXPRESS　5　(1)　6-10　2008/01

    DOI： 10.1587/elex.5.6 　

    ISSN： 1349-2543

  398. 64 and 128 coherent QAM optical transmission over 150 km using frequency-stabilized laser and heterodyne PLL detection Peer-reviewed

    Masato Yoshida, Hiroki Goto, Keisuke Kasai, Masataka Nakazawa

    OPTICS EXPRESS　16　(2)　829-840　2008/01

    DOI： 10.1364/OE.16.000829 　

    ISSN： 1094-4087

  399. 40 GHz bright and dark parabolic pulse generation using a picosecond optical pulse source and a 64-channel AWG Peer-reviewed

    Toshihiko Hirooka, Masataka Nakazawa, Katsunari Okamoto

    2008 CONFERENCE ON OPTICAL FIBER COMMUNICATION/NATIONAL FIBER OPTIC ENGINEERS CONFERENCE, VOLS 1-8　2212-+　2008

    DOI： 10.1109/OFC.2008.4528579 　

  400. All-optical 40 GHz time-domain Fourier transformation using XPM with a dark parabolic pulse Peer-reviewed

    Toshihiko Hirooka, Masataka Nakazawa

    OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference　OThG5　2008

    DOI： 10.1109/OFC.2008.4528464 　

  401. Polarization-multiplexed 1 Gsymbol/s, 128 QAM (14 Gbit/s) coherent optical transmission over 160 km using a 1.4 GHz Nyquist filter Peer-reviewed

    Hiroki Goto, Keisuke Kasai, Masato Yoshida, Masataka Nakazawa

    2008 CONFERENCE ON OPTICAL FIBER COMMUNICATION/NATIONAL FIBER OPTIC ENGINEERS CONFERENCE, VOLS 1-8　133-135　2008

    DOI： 10.1109/OFC.2008.4528075 　

  402. Novel modulation format and high spectral efficiency technology for coherent optical communication systems Peer-reviewed

    Masataka Nakazawa

    2008 DIGEST OF THE LEOS SUMMER TOPICAL MEETINGS　111-112　2008

    DOI： 10.1109/LEOSST.2008.4590514 　

    ISSN： 1099-4742

  403. Frequency Division Multiplexed 1 Gsymbol/s, 64 QAM Coherent Optical Transmission with a Spectral Efficiency of 8.6 bit/s/Hz Peer-reviewed

    Masato Yoshida, Hiroki Goto, Tatsunori Omiya, Keisuke Kasai, Masataka Nakazawa

    2008 34TH EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)　2008

    DOI： 10.1109/ECOC.2008.4729160 　

  404. Challenges to FDM-QAM coherent transmission with ultrahigh spectral efficiency Peer-reviewed

    Masataka Nakazawa

    2008 34TH EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)　2008

    DOI： 10.1109/ECOC.2008.4729190 　

  405. 320 Gbit/s Single-Polarization DPSK Transmission over 525 km Using Time-domain Optical Fourier Transformation Invited Peer-reviewed

    Toshihiko Hirooka, Masatada Okazaki, Pengyu Guan, Masataka Nakazawa

    2008 34TH EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)　2008

    DOI： 10.1109/ECOC.2008.4729323 　

  406. 160 Gbit/s-200 km Field Transmission Experiment Using a Time-Domain Optical Fourier Transformation Technique with a Large PMD Invited Peer-reviewed

    Masatada Okazaki, Pengyu Guan, Toshihiko Hirooka, Masataka Nakazawa, Tetsuya Miyazaki

    2008 34TH EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)　2008

    DOI： 10.1109/ECOC.2008.4729498 　

  407. An ultrastable Cs optical atomic clock with a 9.1926-GHz regeneratively mode-locked fiber laser Peer-reviewed

    T. Hirayama, M. Yakabe, M. Yoshida, M. Nakazawa, Y. Koga, K. Hagimoto

    IEICE Trans. Electron. (in Japanese)　J90-C　(12)　977-987　2007/12

  408. Advanced optical fiber device technology for ultrahigh-speed transmission (Plenary talk) Invited Peer-reviewed

    M. Nakazawa

    5th Workshop on Fibers and Optical Passive Components (WFOPC2007)　2007/12

  409. 10 GHz regeneratively mode-locked semiconductor optical amplifier fiber ring laser and its linewidth characteristics Peer-reviewed

    Masato Yoshida, Atsushi Ono, Masataka Nakazawa

    OPTICS LETTERS　32　(24)　3513-3515　2007/12

    DOI： 10.1364/OL.32.003513 　

    ISSN： 0146-9592

    eISSN： 1539-4794

  410. Optical fiber transmission of standard signals using optical combs Peer-reviewed

    M. Nakazawa, T. Hirooka, M. Yoshida

    The Review of Laser Engineering (in Japanese)　35　(10)　649-653　2007/10

    Publisher: The Laser Society of Japan

    DOI： 10.2184/lsj.35.649 　

    ISSN： 0387-0200

    More details Close

    Recently, the delivery of frequency standards using optical combs through optical fiber networks has become an important subject. When we transmit optical combs through an optical fiber network, it is very important to investigate the distortion in the power spectrum of the longitudinal modes that occurs during the transmission. In this paper, we describe the spectrum deformation of the longitudinal mode that occurs during long-haul transmission through a dispersion-shifted fiber, when we use a 10 GHz mode-locked fiber laser with a linewidth as narrow as 1 kHz as the signal source. We found that the deformation of the longitudinal mode power spectrum occurs mainly at the tail of the spectrum, and the linewidth broadening increases in proportion to the transmission distance. The main reason for the linewidth broadening was the phase fluctuation of the optical fiber caused by temperature fluctuation.

  411. 160 Gbit/s-900 km DPSK transmission with time-domain optical Fourier transformation Peer-reviewed

    T. Hirooka, M. Okazaki, K. Osawa, M. Nakazawa

    European Conference on Optical Communication (ECOC2007)　1.3.3　2007/09

  412. A λ/4-shifted distributed feedback semiconductor fiber ring laser with an OSNR of 85 dB and a linewidth of 7 kHz Peer-reviewed

    A. Suzuki, H. T. Quynhanh, M. Yoshida, M. Nakazawa

    European Conference on Optical Communication (ECOC2007)　1.4.2　2007/09

  413. Observation of stimulated Brillouin scattering in ultrahigh-speed in-phase and carrier-suppressed RZ OTDM transmission Peer-reviewed

    T. Hirooka, K. Osawa, M. Okazaki, M. Nakazawa, H. Murai

    European Conference on Optical Communication (ECOC2007)　P085　2007/09

  414. A 10-GHz optoelectronic oscillator at 850 nm using a single-mode VCSEL and a photonic crystal fiber Peer-reviewed

    Hideaki Hasegawa, Yosuke Oikawa, Masataka Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　19　(17-20)　1451-1453　2007/09

    DOI： 10.1109/LPT.2007.903950 　

    ISSN： 1041-1135

  415. An ultralow noise and narrow linewidth lambda/4-shifted DFB Er-doped fiber laser with a ring cavity configuration Peer-reviewed

    Akihito Suzuki, Youhei Takahashi, Masato Yoshida, Masataka Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　19　(17-20)　1463-1465　2007/09

    DOI： 10.1109/LPT.2007.902697 　

    ISSN： 1041-1135

  416. New frontiers in optical communication: ultrahigh-speed transmission and coherent transmission Invited Peer-reviewed

    M. Nakazawa

    The 3rd International Symposium on Ultrafast Photonic Technolgies　Invited paper, I-1　2007/08

  417. Regeneratively mode-locked fiber laser with a repetition rate stability of 4.9X10(-15) using a hydrogen maser phase-locked loop Peer-reviewed

    Masato Yoshida, Toru Hirayama, Masataka Nakazawa, Ken Hagimoto, Takeshi Ikegami

    OPTICS LETTERS　32　(13)　1827-1829　2007/07

    DOI： 10.1364/OL.32.001827 　

    ISSN： 0146-9592

  418. Advanced optical fiber and fiber device technologies for ultrahigh-speed optical transmission Invited Peer-reviewed

    M. Nakazawa

    Optoelectronics and Communications Conference (OECC2007)　Tutotiral, 11C2-1　2007/07

  419. Ultrahigh-speed signal transmission / processing technologies Invited Peer-reviewed

    T. Hirooka, M. Nakazawa

    Optoelectronics and Communications Conference (OECC2007)　Invited paper, 10B2-1　2007/07

  420. Low power-penalty 160 Gbit/s DPSK transmission over 600 km Peer-reviewed

    K. Osawa, M. Okazaki, T. Hirooka, M. Nakazawa

    Optoelectronics and Communications Conference (OECC2007)　10B2-2　2007/07

  421. A ring-type polarization-maintaining λ/4-shifted distributed feedback fiber laser pumped by 0.98 μm laser diode Peer-reviewed

    Q. A. Ho Thi, A. Suzuki, M. Nakazawa

    Optoelectronics and Communications Conference (OECC2007)　12C2-2　2007/07

  422. 10 GHz regeneratively mode-locked SOA fiber ring laser and its linewidth characteristics Peer-reviewed

    M. Yoshida, A. Ono, M. Nakazawa

    Optoelectronics and Communications Conference (OECC2007)　13C4-2　2007/07

  423. 1 Gsymbol/s, 64 QAM coherent optical transmission with a spectral efficiency of 8 bit/s/Hz using a Nyquist filter Peer-reviewed

    K. Kasai, J. Hongo, H. Goto, M. Yoshida, M. Nakazawa

    Optoelectronics and Communications Conference (OECC2007)　Postdeadline paper PD1-1　2007/07

  424. Mode-hop-free, optical frequency tunable 40-GHz mode-locked fiber laser Peer-reviewed

    Masato Yoshida, Keisuke Kasai, Masataka Nakazawa

    IEEE JOURNAL OF QUANTUM ELECTRONICS　43　(7-8)　704-708　2007/07

    DOI： 10.1109/JQE.2007.901289 　

    ISSN： 0018-9197

    eISSN： 1558-1713

  425. 10-GHz 8.7-ps pulse generation from a single-mode gain-switched AlGaAsVCSEL at 850 nm Peer-reviewed

    Masataka Nakazawa, Hideaki Hasegawa, Yosuke Oikawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　19　(13-16)　1251-1253　2007/07

    DOI： 10.1109/LPT.2007.901742 　

    ISSN： 1041-1135

  426. 1-Gsymbol/s 64-QAM coherent optical transmission over 150 km Peer-reviewed

    Jumpei Hongo, Keisuke Kasai, Masato Yoshida, Masataka Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　19　(9-12)　638-640　2007/05

    DOI： 10.1109/LPT.2007.894944 　

    ISSN： 1041-1135

    eISSN： 1941-0174

  427. Mode-locked laser-type optical atomic clock with an optically pumped Cs gas cell Peer-reviewed

    Toru Hirayama, Masato Yoshida, Masataka Nakazawa, Ken Hagimoto, Takeshi Ikegami

    OPTICS LETTERS　32　(10)　1241-1243　2007/05

    DOI： 10.1364/OL.32.001241 　

    ISSN： 0146-9592

  428. A new Cs optical atomic clock using ultrastable fiber laser and optical comb delivery through optical network (Invited talk) Invited Peer-reviewed

    M. Nakazawa

    NMIJ-BIPM Joint Workshop　2007/05

  429. An ultrastable Cs optical atomic clock with a regeneratively mode-locked fiber laser and an optically pumped Cs gas cell Peer-reviewed

    T. Hirayama, M. Yoshida, M. Nakazawa, K. Hagimoto, T. Ikegami

    Conference on Lasers and Elecro-Optics (CLEO 2007)　Postdeadline paper, CPDB11　2007/05

  430. 40 Gbit/s-2 km photonic crystal fibre transmission with 850 nm singlemode VCSEL Peer-reviewed

    H. Hasegawa, Y. Oikawa, T. Hirooka, M. Nakazawa

    ELECTRONICS LETTERS　43　(11)　642-644　2007/05

    DOI： 10.1049/el:20070171 　

    ISSN： 0013-5194

  431. A CW, polarization-maintaining lambda/4-shifted DFB Er-doped fiber laser at 1.54 mu m Peer-reviewed

    Akihito Suzuki, Youhei Takahashi, Masato Yoshida, Masataka Nakazawa

    IEICE ELECTRONICS EXPRESS　4　(8)　251-257　2007/04

    DOI： 10.1587/elex.4.251 　

    ISSN： 1349-2543

  432. Advanced fiber laser technology for microwave photonics (Plenary Talk) Invited Peer-reviewed

    M. Nakazawa

    Asia-Pacific Microwave Photonics Conference (AP-MWP 2007),　2007/04

  433. Highly spectral-efficient QAM coherent transmission using an optical phase-locked loop over long distances Peer-reviewed

    K. Kasai, J. Hongou, M. Yoshida, M. Nakazawa

    Asia-Pacific Microwave Photonics Conference (AP-MWP 2007)　C-3　2007/04

  434. A mode-locked laser-type optical atomic clock with an optically pumped Cs gas cell Peer-reviewed

    T. Hirayama, M. Yoshida, M. Nakazawa, K. Hagimoto, T. Ikegami

    Asia-Pacific Microwave Photonics Conference (AP-MWP 2007)　D-38　2007/04

  435. 4 x 10 Gb/s WDM transmission over a 5-km-long photonic crystal fiber in the 800-nm region Peer-reviewed

    Yosuke Oikawa, Hideaki Hasegawa, Kenya Suzuki, Yasuyuki Inoue, Toshihiko Hirooka, Masataka Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　19　(5-8)　613-615　2007/03

    DOI： 10.1109/LPT.2007.894354 　

    ISSN： 1041-1135

  436. Ultra-stable regeneratively mode-locked laser as an opto-electronic microwave oscillator and its application to optical metrology Peer-reviewed

    Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka

    IEICE TRANSACTIONS ON ELECTRONICS　E90C　(2)　443-449　2007/02

    DOI： 10.1093/ietele/e90-c.2.443 　

    ISSN： 0916-8524

    eISSN： 1745-1353

  437. Optical phase-locked loop for coherent transmission over 500km using heterodyne detection with fiber lasers Peer-reviewed

    Keisuke Kasai, Jumpei Hongo, Masato Yoshida, Masataka Nakazawa

    IEICE ELECTRONICS EXPRESS　4　(3)　77-81　2007/02

    DOI： 10.1587/elex.4.77 　

    ISSN： 1349-2543

  438. Polarization-multiplexed 1 Gsymbol/s, 64 QAM (12 Gbit/s) coherent optical transmission over 150 km with an optical bandwidth of 2 GHz

    Masataka Nakazawa, Jumpei Hongo, Keisuke Kasai, Masato Yoshida

    Optics InfoBase Conference Papers　2007

    Publisher: Optical Society of America

    ISSN： 2162-2701

  439. 1.5 μm 13C2H2 frequency-stabilized fiber laser and its application to QAM coherent transmission with high spectral efficiency

    Tohoku-Section Joint Convention Record of Institutes of Electrical and Information Engineers, Japan　2007　(0)　29-29　2007

    Publisher: Organizing Committee of Tohoku-Section Joint Convention of Institutes of Electrical and Information Engineers, Japan

    DOI： 10.11528/tsjc.2007.0_29 　

  440. 9.1926-GHz再生モード同期ファイバレーザを用いた高安定Cs光原子時計

    平山徹, 矢加部正嗣, 吉田真人, 中沢正隆, 古賀保喜, 萩本憲

    電子情報通信学会論文誌 C　J90-C　(12)　2007

    ISSN： 1345-2827

  441. 10 Gbit/s 2 km photonic crystal fibre transmission with 850 nm directly modulated singlemode VCSEL Peer-reviewed

    H. Hasegawa, Y. Oikawa, M. Nakazawa

    ELECTRONICS LETTERS　43　(2)　117-119　2007/01

    DOI： 10.1049/el:20073781 　

    ISSN： 0013-5194

  442. Optical phase-locked loop for coherent transmission over 500 km Peer-reviewed

    K. Kasai, M. Yoshida, M. Nakazawa

    Optical Fiber Communication Conference (OFC 2007)　JWA49　2007

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    通研インポート200703

  443. 1 Gsymbol/s, 64 QAM coherent optical transmission over 150 km with a spectral efficiency of 3 bit/s/Hz Peer-reviewed

    Jumpei Hongou, Keisuke Kasai, Masato Yoshida, Masataka Nakazawa

    OFC/NFOEC 2007 - Optical Fiber Communication and the National Fiber Optic Engineers Conference 2007　OMP3　2007

    DOI： 10.1109/OFC.2007.4348615 　

  444. A mode-hop-free, frequency-tunable 40 GHz mode-locked fiber laser Peer-reviewed

    Masato Yshida, Keisuke Kasai, Masataka Nakazawa

    OFC/NFOEC 2007 - Optical Fiber Communication and the National Fiber Optic Engineers Conference 2007　OTuF3　2007

    DOI： 10.1109/OFC.2007.4348785 　

  445. A C2H2 frequency-stabilized erbium-doped fiber laser and its application to coherent communication Peer-reviewed

    Masato Yoshida, Keisuke Kasai, Jumpei Hongo, Masataka Nakazawa

    FIBER LASERS IV: TECHNOLOGY, SYSTEMS, AND APPLICATIONS　6453　6453-85　2007

    DOI： 10.1117/12.714489 　

    ISSN： 0277-786X

  446. Next generation ultrafast telecommunications technologies Invited Peer-reviewed

    Masataka Nakazawa

    Conference on Lasers and Electro-Optics Europe - Technical Digest　Invited paper, TF1-3TUE　2007

    DOI： 10.1109/CLEOE-IQEC.2007.4387086 　

  447. 10 Gbit/s 2 km photonic crystal fibre transmission with 850 nm directly modulated singlemode VCSEL Peer-reviewed

    H. Hasegawa, Y. Oikawa, M. Nakazawa

    Electronics Letters　43　(2)　117-119　2007

    DOI： 10.1049/el:20073781 　

    ISSN： 0013-5194

  448. QAM based coherent transmission technologies using DSP Invited Peer-reviewed

    Masataka Nakazawa

    2007 DIGEST OF THE LEOS SUMMER TOPICAL MEETINGS　47-48　2007

    DOI： 10.1109/LEOSST.2007.4288324 　

  449. Terabit OTDM transmission - Key challenges Invited Peer-reviewed

    Masataka Nakazawa, Toshihiko Hirooka

    2007 DIGEST OF THE LEOS SUMMER TOPICAL MEETINGS　230-231　2007

    DOI： 10.1109/LEOSST.2007.4288418 　

  450. A polarization-maintained, ultranarrow FBG filter with a linewidth of 1.3 GHz Peer-reviewed

    Akihito Suzuki, Youhei Takahashi, Masataka Nakazawa

    IEICE ELECTRONICS EXPRESS　3　(22)　469-473　2006/11

    DOI： 10.1587/elex.3.469 　

    ISSN： 1349-2543

  451. Performance improvement of an acetylene (C2H2) frequency-stabilized fiber laser Peer-reviewed

    Keisuke Kasai, Akihito Suzuki, Masato Yoshida, Masataka Nakazawa

    IEICE ELECTRONICS EXPRESS　3　(22)　487-492　2006/11

    DOI： 10.1587/elex.3.487 　

    ISSN： 1349-2543

  452. 160-Gb/s-600-km OTDM transmission using time-domain optical Fourier transformation Peer-reviewed

    Toshihiko Hirooka, Ken-Ichi Hagiuda, Takashi Kumakura, Kou Osawa, Masataka Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　18　(21-24)　2647-2649　2006/11

    DOI： 10.1109/LPT.2006.887770 　

    ISSN： 1041-1135

  453. Comparison of 40GHz optical demultiplexers using SMZ switch and EA modulator in 160Gbit/s-500km OTDM transmission Peer-reviewed

    Toshihiko Hirooka, Takashi Kumakura, Kou Osawa, Masataka Nakazawa

    IEICE ELECTRONICS EXPRESS　3　(17)　397-403　2006/09

    DOI： 10.1587/elex.3.397 　

    ISSN： 1349-2543

  454. Robust and low-noise fiber based frequency comb for long-term measurement of optical frequencies Peer-reviewed

    H. Inaba, Y. Daimon, F. L. Hong, A. Onae, K. Minoshima, T. R. Schibli, M. Onishi, T. Okuno, M. Hirano, M. Nakazawa, H. Matsumoto

    CPEM2006 Digest　430-431　2006/07

  455. Optical adaptive equalization of high-speed signals using time-domain optical Fourier transformation Peer-reviewed

    Toshihiko Hirooka, Masataka Nakazawa

    JOURNAL OF LIGHTWAVE TECHNOLOGY　24　(7)　2530-2540　2006/07

    DOI： 10.1109/JLT.2006.874647 　

    ISSN： 0733-8724

  456. Long-term measurement of optical frequencies using a simple, robust and low-noise fiber based frequency comb Peer-reviewed

    H Inaba, Y Daimon, FL Hong, A Onae, K Minoshima, TR Schibli, H Matsumoto, M Hirano, T Okuno, M Onishi, M Nakazawa

    OPTICS EXPRESS　14　(12)　5223-5231　2006/06

    DOI： 10.1364/OE.14.005223 　

    ISSN： 1094-4087

  457. 20 Msymbol/s, 64 and 128 QAM coherent optical transmission over 525 km using heterodyne detection with frequency-stabilised laser Peer-reviewed

    M. Nakazawa, M. Yoshida, K. Kasai, J. Hongou

    ELECTRONICS LETTERS　42　(12)　710-712　2006/06

    DOI： 10.1049/el:20060646 　

    ISSN： 0013-5194

  458. Polymer saturable absorber materials in the 1.5 mu m band using poly-methyl-methacrylate and polystyrene with single-wall carbon nanotubes and their application to a femtosecond laser Peer-reviewed

    M Nakazawa, S Nakahara, T Hirooka, M Yoshida

    OPTICS LETTERS　31　(7)　915-917　2006/04

    DOI： 10.1364/OL.31.000915 　

    ISSN： 0146-9592

  459. 10Gb/s transmission over 5 km at 850nm using single-mode photonic crystal fiber, single-mode VCSEL, and Si-APD Peer-reviewed

    Hideaki Hasegawa, Yosuke Oikawa, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa

    IEICE ELECTRONICS EXPRESS　3　(6)　109-114　2006/03

    DOI： 10.1587/elex.3.109 　

    ISSN： 1349-2543

  460. ABCD matrix formalism of time-domain optical Fourier transformation for distortion-free pulse transmission Peer-reviewed

    Masataka Nakazawa, Toshihiko Hirooka

    IEICE ELECTRONICS EXPRESS　3　(4)　74-79　2006/02

    DOI： 10.1587/elex.3.74 　

    ISSN： 1349-2543

  461. 10 Gb/s x 4 channel WDM transmission over a 3 km-long photonic crystal fiber in the 800 nm region

    Tohoku-Section Joint Convention Record of Institutes of Electrical and Information Engineers, Japan　2006　(0)　13-13　2006

    Publisher: Organizing Committee of Tohoku-Section Joint Convention of Institutes of Electrical and Information Engineers, Japan

    DOI： 10.11528/tsjc.2006.0_13 　

  462. Fiber transmission of microwave and optical standard signals using a mode-locked fiber laser in the GHz region

    Tohoku-Section Joint Convention Record of Institutes of Electrical and Information Engineers, Japan　2006　(0)　14-14　2006

    Publisher: Organizing Committee of Tohoku-Section Joint Convention of Institutes of Electrical and Information Engineers, Japan

    DOI： 10.11528/tsjc.2006.0_14 　

  463. An acetylene ((C2H2)-C-13) stabilized single-polarization fiber laser Peer-reviewed

    Keisuke Kasai, Masato Yoshida, Masataka Nakazawa

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS　89　(10)　9-17　2006

    DOI： 10.1002/ecjb.20235 　

    ISSN： 8756-663X

  464. 10 Gb/s transmission over 3 km at 850 nm using single-mode photonic crystal fiber, single-mode VCSEL, and Si-APD Peer-reviewed

    Hideaki Hasegawa, Yosuke Oikawa, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa

    2006 OPTICAL FIBER COMMUNICATION CONFERENCE/NATIONAL FIBER OPTIC ENGINEERS CONFERENCE, VOLS 1-6　1822-1824　2006

  465. Measurements of longitudinal linewidth and relative intensity noise in ultrahigh-speed mode-locked semiconductor lasers Peer-reviewed

    K Haneda, M Yoshida, H Yokoyama, Y Ogawa, M Nakazawa

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS　89　(2)　28-36　2006

    DOI： 10.1002/ecjb.20185 　

    ISSN： 8756-663X

  466. Characteristics of CPT signals of Cs-D1 and Cs-D2 lines Peer-reviewed

    K. Hagimoto, T. Hirayama, K. Watanabe, T. Ikegami, S. Ohshima, M. Yoshida, M. Nakazawa

    Workshop on Chirp Scale Atomic Clock: Status and Potentiality　38751　2006

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    通研ＤＢインポート

  467. A (C2H2)-C-13 frequency-stabilized, polarization-maintained 1.54 mu m erbium fiber ring laser with a new feedback system Peer-reviewed

    Keisuke Kasai, Masato Yoshida, Masataka Nakazawa

    2006 OPTICAL FIBER COMMUNICATION CONFERENCE/NATIONAL FIBER OPTIC ENGINEERS CONFERENCE, VOLS 1-6　866-868　2006

  468. Polymer saturable absorber materials in 1.5 mu m band using PMMA and PS with single-wall carbon nanotubes Peer-reviewed

    Masataka Nakazawa, Seiji Nakahara, Toshihiko Hirooka, Masato Yoshida, Toshikuni Kaino, Kyoji Komatsu

    2006 OPTICAL FIBER COMMUNICATION CONFERENCE/NATIONAL FIBER OPTIC ENGINEERS CONFERENCE, VOLS 1-6　2154-+　2006

  469. Recent progress and future prospects for high-speed optical transmission technology using an ultrashort optical pulse train (Invited Paper) Peer-reviewed

    M. Nakazawa, T. Hirooka

    IEICE Transactions on Communications　J89-B　(11)　2067-2081　2006

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    通研インポート200703

  470. Ultra-broadband dispersion measurement of photonic crystal fiber with pico-second streak camera and group-delay-free supercontinuum Peer-reviewed

    Y. Oikawa, H. Hasegawa, T. Hirooka, M. Yoshida, M. Nakazawa

    IEICE Transactions on Electronics (in Japanese)　J89-C　(7)　450-457　2006

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 1345-2827

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    通研インポート200703

  471. Regeneratively mode-locked laser as an opto-electronic microwave oscillator and its application to optical metrology (Invited Paper) Peer-reviewed

    M. Nakazawa

    2006 Asia-Pacific Microwave Photonics Conference (AP-MWP2006)　K-1　2006

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    通研インポート200703

  472. An ultra-low noise and narrow linewidth λ/4-shifted DFB Er-doped fiber laser with a ring configuration Peer-reviewed

    Akihito Suzuki, Youhei Takahashi, Masato Yoshida, Masataka Nakazawa

    2006 European Conference on Optical Communications Proceedings, ECOC 2006　Th2.3.2　2006

    DOI： 10.1109/ECOC.2006.4800962 　

  473. Polarization-maintained, ultranarrow FBG filter with 1.3 GHz linewidth Peer-reviewed

    A. Suzuki, Y. Takahashi, M. Nakazawa

    European Optical Society Annual Meeting 2006, Topical Meeting on Extreme Optics (TOM 2)　66-67　2006

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    通研インポート200703

  474. A 1.54 #Gmu#GRm 13C2H2 frequency-stabilized, single-polarization fiber ring laser Peer-reviewed

    K. Kasai, M. Yoshida, M. Nakazawa

    European Optical Society Annual Meeting 2006, Topical Meeting on Extreme Optics (TOM 2)　94-95　2006

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    通研インポート200703

  475. 10 Gb/s x 4 channel WDM transmission over 3 km in the 800 nm region using photonic crystal fibers Peer-reviewed

    H. Hasegawa, Y. Oikawa, T. Hirooka, M. Yoshida, K. Suzuki, Y. Inoue, M. Nakazawa

    European Conference on Optical Communication (ECOC 2006)　We4.5.4　2006

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    通研インポート200703

  476. Ultrahigh-speed fiber laser and its application to optical metrology Peer-reviewed

    Masataka Nakazawa

    Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference, CLEO/QELS 2006　CTuV4　2006

    DOI： 10.1109/CLEO.2006.4628299 　

  477. Distortion-free optical transmission using time-domain optical Fourier transformation and transform-limited optical pulses Peer-reviewed

    M Nakazawa, T Hirooka

    JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS　22　(9)　1842-1855　2005/09

    DOI： 10.1364/JOSAB.22.001842 　

    ISSN： 0740-3224

  478. Ultrastable cesium atomic clock with a 9.1926-GHz regeneratively mode-locked fiber laser Peer-reviewed

    M Yakabe, K Nito, M Yoshida, M Nakazawa, Y Koga, K Hagimoto, T Ikegami

    OPTICS LETTERS　30　(12)　1512-1514　2005/06

    DOI： 10.1364/OL.30.001512 　

    ISSN： 0146-9592

  479. Linewidth and relative intensity noise measurements of longitudinal modes in ultrahigh-speed mode-locked laser diodes Peer-reviewed

    K Haneda, M Yoshida, M Nakazawa, H Yokoyama, Y Ogawa

    OPTICS LETTERS　30　(9)　1000-1002　2005/05

    DOI： 10.1364/OL.30.001000 　

    ISSN： 0146-9592

    eISSN： 1539-4794

  480. 40-GHz, 100-fs stimulated-Brillouin-scattering-free pulse generation by combining a mode-locked laser diode and a dispersion-decreasing fiber Peer-reviewed

    K Hagiuda, T Hirooka, M Nakazawa

    OPTICS LETTERS　30　(6)　670-672　2005/03

    DOI： 10.1364/OL.30.000670 　

    ISSN： 0146-9592

  481. Stimulated Brillouin scattering in dispersion-decreasing fiber with ultrahigh-speed femtosecond soliton pulse compression Peer-reviewed

    T Hirooka, S Ono, K Hagiuda, M Nakazawa

    OPTICS LETTERS　30　(4)　364-366　2005/02

    DOI： 10.1364/OL.30.000364 　

    ISSN： 0146-9592

  482. A new ultrastable cesium optical atomic clock with a 9.1926-GHz regeneratively mode-locked fiberlaser Peer-reviewed

    M Yakabe, K Nito, M Yoshida, M Nakazawa, Y Koga, K Hagimoto, T Ikegami

    ULTRAFAST PHENOMENA XIV　79　831-833　2005

    ISSN： 0172-6218

  483. Photon number squeezing of ultrabroadband pulses generated by microstructure fibers Peer-reviewed

    H Furumochi, A Tada, K Hirosawa, F Kannari, M Takeoka, M Nakazawa

    ULTRAFAST PHENOMENA XIV　79　873-875　2005

    ISSN： 0172-6218

  484. Linewidth and RIN measurements of longitudinal modes in ultrahigh-speed mode-locked laser diodes Peer-reviewed

    K Haneda, H Yokoyama, Y Ogawa, M Nakazawa

    ULTRAFAST PHENOMENA XIV　79　780-782　2005

    ISSN： 0172-6218

  485. Stimulated Brillouin scattering in ultrahigh-speed femtosecond soliton pulse compression with a dispersion-decreasing fiber Peer-reviewed

    T Hirooka, S Ono, KI Hagiuda, M Nakazawa

    ULTRAFAST PHENOMENA XIV　79　43-45　2005

    ISSN： 0172-6218

  486. Optimization of a 40 GHz regeneratively and harmonically mode-locked fiber laser under PLL operation and its longitudinal mode characteristics Peer-reviewed

    M Yoshida, T Yaguchi, S Harada, M Nakazawa

    ULTRAFAST PHENOMENA XIV　79　765-767　2005

    ISSN： 0172-6218

  487. Measurements of longitudinal linewidth and relative intensity noise in ultrahigh-speed mode-locked semiconductor lasers Peer-reviewed

    K. Haneda, M. Yoshida, H. Yokoyama, Y. Ogawa, M. Nakazawa

    IEICE Trans. Electron. (in Japanese)　J88-C　(3)　161-168　2005

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    通研ＤＢインポート

  488. Distortion-free optical fiber transmission of ultrashort optical pulses using time-domain optical Fourier transformation Peer-reviewed

    M. Nakazawa, T. Hirooka

    Japanese Journal of Optics (in Japanese)　(1)　26-31　2005

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    通研ＤＢインポート

  489. Microwave frequency tuning characteristics of an opto-microwave oscillator made of fiber laser and its application to Ramsey fringe observation Peer-reviewed

    M. Yakabe, K. Nito, M. Yoshida, M. Nakazawa

    IEICE Trans. Comm. (in Japanese)　J88-B　(9)　1829-1836　2005

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  490. Observation of optimum air-hole tapering of splicing between a conventional fiber and a photonic crystal fiber and analysis of reduction of Fresnel reflection Peer-reviewed

    H. Hasegawa, M.Kikegawa, M. Yoshida, T. Hirooka, M. Nakazawa

    IEICE Trans. Electron. (in Japanese)　J88-C　(10)　779-787　2005

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    通研ＤＢインポート

  491. Acetylene (13C2H2) stabilized single-polarization fiber laser Peer-reviewed

    K. Kasai, M. Yoshida, M. Nakazawa

    IEICE Trans. Electron. (in Japanese)　J88-C　(9)　708-715　2005

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    通研ＤＢインポート

  492. A new method for optimum dispersion designing of zero-dispersion and dispersion-flattened photonic crystal fibers Peer-reviewed

    H. Hasegawa, T. Hirooka, M. Nakazawa

    IEICE Trans. Electron. (in Japanese)　J88-C　(7)　519-527　2005

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  493. Ultrahigh-speed distortion-free optical pulse transmission using time-domain optical Fourier transformation Peer-reviewed

    T. Hirooka, M. Nakazawa, F. Futami, S. Watanabe

    IEICE Trans. Comm. (in Japanese)　J88-B　(8)　1402-1410　2005

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    通研ＤＢインポート

  494. New optimum dispersion design method for zero-dispersion and dispersion-flattened photonic crystal fibers Peer-reviewed

    H Hasegawa, T Hirooka, M Nakazawa

    2005 PACIFIC RIM CONFERENCE ON LASERS AND ELECTRO-OPTICS　349-350　2005

    DOI： 10.1109/CLEOPR.2005.1569519 　

  495. An ultrastable Cs optical atomic clock with a 9.1926-GHz low-drift regeneratively mode-locked fiber laser Peer-reviewed

    T Hirayama, M Yakabe, M Yoshida, M Nakazawa, Y Koga, K Hagimoto

    2005 PACIFIC RIM CONFERENCE ON LASERS AND ELECTRO-OPTICS　1025-1026　2005

    DOI： 10.1109/CLEOPR.2005.1569864 　

  496. A (C2H2)-C-13 frequency-stabilized, polarization-maintained erbium fiber ring laser with no frequency modulation Peer-reviewed

    K Kasai, M Yoshida, M Nakazawa, K Shiota, S Masuda

    2005 PACIFIC RIM CONFERENCE ON LASERS AND ELECTRO-OPTICS　295-296　2005

    DOI： 10.1109/CLEOPR.2005.1569492 　

  497. An ultrastable Cs optical atomic clock with a laser-type opto-microwave oscillator Peer-reviewed

    T. Hirayama, M. Yakabe, M. Yoshida, M. Nakazawa, Y. Koga, K. Hagimoto, T. Ikegami

    NMIJ-BIPM Workshop on the Impact of Information Technology in Metrology　2005

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  498. Ultrahigh-speed distortion-free transmission using all-optical time-domain Fourier transformation Peer-reviewed

    T Hirooka, M Nakazawa

    2005 PACIFIC RIM CONFERENCE ON LASERS AND ELECTRO-OPTICS　1001-1002　2005

    DOI： 10.1109/CLEOPR.2005.1569852 　

  499. A C2H2 frequency-stabilized, single-polarization fiber laser Peer-reviewed

    K. Kasai, M. Yoshida, M. Nakazawa

    NMIJ-BIPM Workshop on the Impact of Information Technology in Metrology　2005

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    通研ＤＢインポート

  500. Ultrastable mode-locked fiber lasers and their application to optical comb delivery through optical fiber networks (Invited paper) Peer-reviewed

    M. Nakazawa

    NMIJ-BIPM Workshop on the Impact of Information Technology in Metrology　2005

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  501. Derivation of analytical expression for third-order dispersion elimination using time-domain optical Fourier transformation Peer-reviewed

    Toshihiko Hirooka, Masataka Nakazawa

    IET Conference Publications　2005　(502)　653-654　2005

    Publisher: Institution of Engineering and Technology

    DOI： 10.1049/cp:20050655 　

  502. An ultrastable PLL mode-locked fiber laser with a hydrogen maser clock Peer-reviewed

    M Yoshida, T Hirayama, M Yakabe, M Nakazawa, Y Koga, K Hagimoto

    2005 PACIFIC RIM CONFERENCE ON LASERS AND ELECTRO-OPTICS　1027-1028　2005

    DOI： 10.1109/CLEOPR.2005.1569865 　

  503. Measurement of longitudinal linewidth broadening of mode-locked lasers during ultrahigh-speed pulse transmission Peer-reviewed

    Osawa, K. Haneda, S. Waiyapot, M. Nakazawa

    NMIJ-BIPM Workshop on the Impact of Information Technology in Metrology　2005

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  504. Measurement of optical carrier spectrum deformation in high-speed pulse transmission Peer-reviewed

    K Osawa, K Haneda, T Hirooka, M Yoshida, S Waiyapot, M Nakazawa

    2005 PACIFIC RIM CONFERENCE ON LASERS AND ELECTRO-OPTICS　998-1000　2005

    DOI： 10.1109/CLEOPR.2005.1569851 　

  505. Observation of optimum air-hole tapering of splicing between conventional fiber and photonic crystal fiber and analysis of reduction in Fresnel reflection Peer-reviewed

    H Hasegawa, M Kikegawa, M Yoshida, T Hirooka, M Nakazawa

    2005 PACIFIC RIM CONFERENCE ON LASERS AND ELECTRO-OPTICS　345-346　2005

    DOI： 10.1109/CLEOPR.2005.1569517 　

  506. Ultra-broadband dispersion measurement of photonic crystal fiber with pico-second streak camera and group-delay-free supercontinuum Peer-reviewed

    Y Oikawa, H Hasegawa, M Yoshida, T Hirooka, M Nakazawa

    2005 PACIFIC RIM CONFERENCE ON LASERS AND ELECTRO-OPTICS　337-339　2005

    DOI： 10.1109/CLEOPR.2005.1569514 　

  507. New adaptive equalization scheme for 160 Gb/s transmitted signal using time-domain optical Fourier transformation Peer-reviewed

    T. Hirooka, M. Nakazawa, F. Futami, S. Watanabe

    30th European Conference on Optical Communication　Paper Th1.5.3　2004/09

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    <RIEC><DUMMY>あ</DUMMY><BIBID>2003500798</BIBID></RIEC>

  508. A 13C2H2 frequency-stabilized, polarization-maintained erbium fiber ring laser with no frequency modulation Peer-reviewed

    K. Kasai, M. Yoshida, M. Nakazawa

    30th European Conference on Optical Communication　Paper Th1.3.5　2004/09

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    <RIEC><DUMMY>あ</DUMMY><BIBID>2003500797</BIBID></RIEC>

  509. Generation of a 40-GHz, 100-fs pulse train from a mode-locked laser diode using DDF soliton compression Peer-reviewed

    K. Hagiuda, T. Hirooka, S. Ono, M. Yoshida, M. Nakazawa, S. Arahira, Y. Ogawa

    30th European Conference on Optical Communication　Paper Tu3.3.2　2004/09

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    <RIEC><DUMMY>あ</DUMMY><BIBID>2003500796</BIBID></RIEC>

  510. A 40 GHz regeneratively and harmonically mode-locked erbium-doped fiber laser and its longitudinal-mode characteristics Peer-reviewed

    M Yoshida, T Yaguchi, S Harada, M Nakazawa

    IEICE TRANSACTIONS ON ELECTRONICS　E87C　(7)　1166-1172　2004/07

    ISSN： 0916-8524

    eISSN： 1745-1353

  511. Ideal distortion-free transmission using optical Fourier transformation and Fourier transform-limited optical pulses Peer-reviewed

    M Nakazawa, T Hirooka, F Futami, S Watanabe

    IEEE PHOTONICS TECHNOLOGY LETTERS　16　(4)　1059-1061　2004/04

    ISSN： 1041-1135

  512. Gaussian and sech approximations of mode field profiles in photonic crystal fibers Peer-reviewed

    T Hirooka, Y Hori, M Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　16　(4)　1071-1073　2004/04

    ISSN： 1041-1135

  513. Parabolic pulse generation by use of a dispersion-decreasing fiber with normal group-velocity dispersion Peer-reviewed

    T Hirooka, M Nakazawa

    OPTICS LETTERS　29　(5)　498-500　2004/03

    ISSN： 0146-9592

  514. Ultrafast optical pulses and solitons for advanced communications Invited Peer-reviewed

    M. Nakazawa

    Pacific Rim Conference on Lasers and Electro-Optics, Invited paper, Tu3G-(6)-1　2003/12

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    <RIEC><DUMMY>あ</DUMMY><BIBID>2003500283</BIBID></RIEC>

  515. Ideal distortion-free transmission using optical Fourier transformation and transform-limited ultrashort pulses Peer-reviewed

    M. Nakazawa, T. Hirooka, F. Futami, S. Watanabe

    European Conference on Optical Communication, Post-deadline paper, Th4.3.8　2003/09

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    <RIEC><DUMMY>あ</DUMMY><BIBID>2003500281</BIBID></RIEC>

  516. Ultrahigh speed optical transmission using femtosecond pulses and emerging new technology Invited Peer-reviewed

    M. Nakazawa

    Europe-U.S.-Japan Symposium on Ultrafast Photonic Technology, Invited paper　2003/07

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    <RIEC><DUMMY>あ</DUMMY><BIBID>2003500289</BIBID></RIEC>

  517. 1.28 Tbit/s-70-km OTDM femtosecond-pulse transmission using third- and fourth-order simultaneous dispersion compensation with a phase modulator Peer-reviewed

    T Yamamoto, KR Tamura, M Nakazawa

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART I-COMMUNICATIONS　86　(3)　68-79　2003

    DOI： 10.1002/ecja.10028 　

    ISSN： 8756-6621

  518. Origin of group delay ripple in chirped fiber Bragg gratings and its effective reduction method Peer-reviewed

    T Komukai, T Inui, M Nakazawa

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS　86　(8)　76-84　2003

    DOI： 10.1002/ecjb.10007 　

    ISSN： 8756-663X

  519. Observation of acetylene molecular absorption line with tunable, single-frequency, and mode-hop-free erbium-doped fiber ring laser Peer-reviewed

    H Inaba, A Onae, Y Akimoto, T Komukai, M Nakazawa

    IEEE JOURNAL OF QUANTUM ELECTRONICS　38　(10)　1325-1330　2002/10

    DOI： 10.1109/JQE.2002.802959 　

    ISSN： 0018-9197

    eISSN： 1558-1713

  520. Adaptive dispersion slope equalizer using a nonlinearly chirped fiber Bragg grating pair with a novel dispersion detection technique Peer-reviewed

    T Inui, T Komukai, M Nakazawa, K Suzuki, KR Tamura, K Uchiyama, T Morioka

    IEEE PHOTONICS TECHNOLOGY LETTERS　14　(4)　549-551　2002/04

    DOI： 10.1109/68.992607 　

    ISSN： 1041-1135

  521. 100 km transmission of a 640 Gbitls OTDM signal using femtosecond pulses Peer-reviewed

    T Yamamoto, E Yoshida, KR Tamura, M Nakazawa

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART I-COMMUNICATIONS　85　(5)　48-56　2002

    ISSN： 8756-6621

  522. Ultrahigh-speed OTDM transmission beyond 1 tera bit-per-second using a femtosecond pulse train Peer-reviewed

    M Nakazawa, T Yamamoto, KR Tamura

    IEICE TRANSACTIONS ON ELECTRONICS　E85C　(1)　117-125　2002/01

    ISSN： 0916-8524

    eISSN： 1745-1353

  523. フォトニック結晶ファイバ Peer-reviewed

    中沢 正隆

    レーザー研究　30　(8)　426-434　2002

    DOI： 10.2184/lsj.30.426 　

  524. 100 km transmission of a 640 Gbitls OTDM signal using femtosecond pulses Peer-reviewed

    T Yamamoto, E Yoshida, KR Tamura, M Nakazawa

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART I-COMMUNICATIONS　85　(5)　48-56　2002

    DOI： 10.1002/ecja.1096 　

    ISSN： 8756-6621

  525. Recent progress on photonic crystal fibers Peer-reviewed

    Masataka Nakazawa

    3rd Chitose International Forum on Photonics Science & Technology　105-106 (IV-5)　2002

  526. Ultrafast optical TDM transmission with the use of novel nonlinear optical fiber devices Peer-reviewed

    Masataka Nakazawa

    Nonlinear Guided Waves and Their Applications 2002　NLTuC1-1-NLTuC1-3　2002

  527. Ultrafast optical TDM transmission with the use of femtosecond pulses Peer-reviewed

    Masataka Nakazawa

    Nonlinear Optics 2002　69-71 (TuA2)　2002

  528. Longitudinal linewidth measurement of 10 GHz, picosecond mode-locked erbium-doped fiber lasers using a heterodyne detection method Peer-reviewed

    Masato Yoshida, Choi Samuel, Masataka Nakazawa

    The 9th International Workshop on Femtosecond Technology　155 (FC-3)　2002

  529. A discretely tunable mode-locked laser with 32 wavelengths and 100-GHz channel spacing using an arrayed waveguide grating Peer-reviewed

    KR Tamura, Y Inoue, K Sato, T Komukai, A Sugita, M Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　13　(11)　1227-1229　2001/11

    ISSN： 1041-1135

  530. 54-fs, 10-GHz soliton generation from a polarization-maintaining dispersion-flattened dispersion-decreasing fiber pulse compressor Peer-reviewed

    K. R. Tamura, M. Nakazawa

    Optics Letters　26　(11)　762-764　2001/06/01

    Publisher: Optical Society of America (OSA)

    DOI： 10.1364/OL.26.000762 　

    ISSN： 0146-9592

  531. A polarization-maintaining pedestal-free femtosecond pulse compressor incorporating an ultrafast dispersion-imbalanced nonlinear optical loop mirror Peer-reviewed

    K. R. Tamura, M. Nakazawa

    IEEE Photonics Technology Letters　13　(5)　526-528　2001/05

    DOI： 10.1109/68.920774 　

    ISSN： 1041-1135

  532. Third- and fourth-order active dispersion compensation with a phase modulator in a terabit-per-second optical time-division multiplexed transmission Peer-reviewed

    T Yamamoto, M Nakazawa

    OPTICS LETTERS　26　(9)　647-649　2001/05

    DOI： 10.1364/OL.26.000647 　

    ISSN： 0146-9592

  533. Cesium optical atomic clock: an optical pulse that tells the time Peer-reviewed

    M Nakazawa, K Suzuki

    OPTICS LETTERS　26　(9)　635-637　2001/05

    DOI： 10.1364/OL.26.000635 　

    ISSN： 0146-9592

  534. Low-loss, 2km-long photonic crystal fiber with zero GVD in the near IR suitable for picosecond pulse propagation at the 800 nm band Peer-reviewed

    H. Kubota, K. Suzuki, S. Kawanishi, M. Nakazawa, M. Tanaka, M. Fujita

    CLEO 2001　CPD3　2001/05

  535. A mode-locked frequency-shifted feedback fiber laser Peer-reviewed

    M. Yoshida, M. Fujimoto, M. Nakazawa, H. Ito

    CLEO 2001　CWA50　2001/05

  536. Highly efficient tunable fiber Bragg grating filters using multilayer piezoelectric transducers Peer-reviewed

    T Inui, T Komukai, M Nakazawa

    OPTICS COMMUNICATIONS　190　(1-6)　1-4　2001/04

    DOI： 10.1016/S0030-4018(01)00987-7 　

    ISSN： 0030-4018

  537. Propagation of a solitonlike nonlinear pulse in average normal group-velocity dispersion and its unsuitability for high-speed, long-distance optical transmission Peer-reviewed

    M Nakazawa, A Sahara, H Kubota

    JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS　18　(4)　409-418　2001/04

    DOI： 10.1364/JOSAB.18.000409 　

    ISSN： 0740-3224

  538. Very low group delay ripple characteristics of fibre Bragg grating with chirp induced by an S-curve bending technique Peer-reviewed

    T Komukai, T Inui, M Nakazawa

    ELECTRONICS LETTERS　37　(7)　449-451　2001/03

    ISSN： 0013-5194

  539. 32 wavelength tunable mode-locked laser with 100 GHz channel spacing using an arrayed waveguide grating Peer-reviewed

    K. R. Tamura, Y. Inoue, K. Sato, T. Komukai, A. Sugita, M. Nakazawa

    OFC 2001　TuJ5　2001/03

  540. 1 Tb/s(40 Gb/s x 25 channel)DWDM quasi-DM soliton transmission over 1,500 km using dispersion-managed single-mode fiber and conventional C-band EDFAs Invited Peer-reviewed

    K. Suzuki, H. Kubota, M. Nakazawa

    OFC 2001　TuN7　2001/03

  541. Third-and fourth-order active dispersion compensation using a phase modulator in a terabit/s OTDM transmission Peer-reviewed

    T. Yamamoto, M. Nakazawa

    OFC 2001　WH6　2001/03

  542. High sensitivity waveform measurement of 160 Gbit/s signal with optical sampling using quasi-phasematched mixing in LiNbO3 waveguide Peer-reviewed

    S. Kawanishi, T. Yamamoto, M. Nakazawa

    OFC 2001　WY6　2001/03

  543. Ultrashort optical pulse transmission characteristics of vertically coupled microring resonator add/drop filter Peer-reviewed

    S Suzuki, Y Kokubun, M Nakazawa, T Yamamoto, ST Chu

    JOURNAL OF LIGHTWAVE TECHNOLOGY　19　(2)　266-271　2001/02

    DOI： 10.1109/50.917900 　

    ISSN： 0733-8724

  544. Adaptive dispersion slope equalizer for dispersion-shifted fibers using a nonlinearly chirped fiber Bragg grating pair Peer-reviewed

    T Inui, T Komukai, M Nakazawa, K Suzuki, KR Tamura, K Uchiyama, T Morioka

    CLEO(R)/PACIFIC RIM 2001, POSTDEADLINE PAPER　14-15　2001

  545. Ultrahigh speed OTDM transmission using femtosecond pulses Peer-reviewed

    M Nakazawa, T Yamamoto, K Tamura

    CLEO(R)/PACIFIC RIM 2001, VOL I, TECHNICAL DIGEST　618-619　2001

  546. Ultrabroad band white light generation from a multimode photonic bandgap fiber with an air core Peer-reviewed

    K Suzuki, M Nakazawa

    CLEO(R)/PACIFIC RIM 2001, POSTDEADLINE PAPER　24-25　2001

  547. 40Gbit/s return-to-zero transmission over 500km of standard fibre using chirped fibre Bragg gratings with small group delay ripples Peer-reviewed

    A Sahara, T Komukai, E Yamada, M Nakazawa

    ELECTRONICS LETTERS　37　(1)　8-9　2001/01

    DOI： 10.1049/el:20010006 　

    ISSN： 0013-5194

  548. 40Gbit/s return-to-zero transmission over 500km of standard fibre using chirped fibre Bragg gratings with small group delay ripples Peer-reviewed

    A Sahara, T Komukai, E Yamada, M Nakazawa

    ELECTRONICS LETTERS　37　(1)　8-9　2001/01

    ISSN： 0013-5194

  549. A 40-GHz 850-fs regeneratively FM mode-locked polarization-maintaining erbium fiber ring laser Peer-reviewed

    M Nakazawa, E Yoshida

    IEEE PHOTONICS TECHNOLOGY LETTERS　12　(12)　1613-1615　2000/12

    DOI： 10.1109/68.896324 　

    ISSN： 1041-1135

  550. A wavelength-tunable dispersion equalizer using a nonlinearly chirped fiber Bragg grating pair mounted on multilayer piezoelectric transducers Peer-reviewed

    T Inui, T Komukai, M Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　12　(12)　1668-1670　2000/12

    DOI： 10.1109/68.896343 　

    ISSN： 1041-1135

  551. Toward a terabit/sec single-channel OTDM transmission(招待講演) Invited Peer-reviewed

    M. Nakazawa, T. Yamamoto, K. R. Tamura

    Microwave Workshops and Exhibition 2000　WS10-5　2000/12

  552. 1.28Tbit/s-70 km OTDM transmission using third- and fourth-order simultaneous dispersion compensation with a phase modulator Peer-reviewed

    M Nakazawa, T Yamamoto, KR Tamura

    ELECTRONICS LETTERS　36　(24)　2027-2029　2000/11

    DOI： 10.1049/el:20001391 　

    ISSN： 0013-5194

  553. Solitons for breaking barriers to terabit/second WDM and OTDM transmission in the next millennium Peer-reviewed

    M Nakazawa

    IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS　6　(6)　1332-1343　2000/11

    DOI： 10.1109/2944.902187 　

    ISSN： 1077-260X

    eISSN： 1558-4542

  554. 40-Gb/s RZ transmission over a transoceanic distance in a dispersion managed standard fiber using a modified inline synchronous modulation method Peer-reviewed

    A Sahara, T Inui, T Komukai, H Kubota, M Nakazawa

    JOURNAL OF LIGHTWAVE TECHNOLOGY　18　(10)　1364-1373　2000/10

    DOI： 10.1109/50.887187 　

    ISSN： 0733-8724

    eISSN： 1558-2213

  555. The tolerance of the strength of dispersion map in the dispersion managed soliton system with the synchronous modulation Peer-reviewed

    A. Sahara, H. Kubota, M. Nakazawa

    ROSC International Workshop 2000　2000/10

  556. 640 Gb/s(40 Gb/s x 16 channel)-1,000 km dense WDM dispersion-managed soliton transmission Peer-reviewed

    K. Suzuki, H. Kubota, M. Nakazawa

    ROSC 2000　2000/10

  557. Recent progress in soliton transmission technology Peer-reviewed

    M Nakazawa, H Kubota, K Suzuki, E Yamada, A Sahara

    CHAOS　10　(3)　486-514　2000/09

    DOI： 10.1063/1.1311394 　

    ISSN： 1054-1500

  558. 1.28 Tbit/s-70 km optical transmission using third-and forth-order simultaneous dispersion compensation with a phase modulator Peer-reviewed

    M. Nakazawa, T. Yamamoto, K. R. Tamura

    ECOC 2000(European Conference on Optical Communication)　2.5　2000/09

  559. Fundamentals of stable continuum generation at high repetition rates Peer-reviewed

    KR Tamura, H Kubota, M Nakazawa

    IEEE JOURNAL OF QUANTUM ELECTRONICS　36　(7)　773-779　2000/07

    DOI： 10.1109/3.848347 　

    ISSN： 0018-9197

  560. Group delay ripple reduction and reflectivity increase in a chirped fiber Bragg crating by multiple-overwriting of a phase mask with an electron-beam Peer-reviewed

    T Komukai, T Inui, M Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　12　(7)　816-818　2000/07

    DOI： 10.1109/68.853510 　

    ISSN： 1041-1135

  561. Large capacity soliton transmission using optical TDM technology(招待講演) Invited Peer-reviewed

    M. Nakazawa

    OECC 2000　13A2-1　2000/07

  562. Ultra-short pulse transmission characteristics of a vertically coupled microring resonator Add/Drop filter Peer-reviewed

    S. Suzuki, Y. Kokubun, M. Nakazawa, T. Yamamoto, S. T. Chu

    OECC 2000　14B2-3　2000/07

  563. A wavelength tunable dispersion equalizer using a nonlinearly chirped fiber Bragg grating pair mounted on multi-layer piezoelectric transducers Invited Peer-reviewed

    T. Inui, T. Komukai, M. Nakazawa

    OECC 2000　14C4-3　2000/07

  564. Experimental observation of mode behavior in erbium-doped optical fiber ring laser Peer-reviewed

    H Inaba, Y Akimoto, K Tamura, E Yoshida, T Komukai, M Nakazawa

    OPTICS COMMUNICATIONS　180　(1-3)　121-125　2000/06

    DOI： 10.1016/S0030-4018(00)00669-6 　

    ISSN： 0030-4018

  565. 40-Gb/s RZ transmission over transoceanic distance in a dispersion managed standard fiber using a new inline synchronous modulation method Peer-reviewed

    A Sahara, T Inui, T Komukai, H Kubota, M Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　12　(6)　720-722　2000/06

    DOI： 10.1109/68.849096 　

    ISSN： 1041-1135

  566. The design of dispersion equalizers using chirped fiber Bragg gratings Peer-reviewed

    T Komukai, T Inui, M Nakazawa

    IEEE JOURNAL OF QUANTUM ELECTRONICS　36　(4)　409-417　2000/04

    DOI： 10.1109/3.831015 　

    ISSN： 0018-9197

  567. 640Gbit/s (40 Gbit/s x 16 channel) dispersion-managed DWDM soliton transmission over 1000km with spectral efficiency of 0.4bit/Hz Peer-reviewed

    K Suzuki, H Kubota, A Sahara, M Nakazawa

    ELECTRONICS LETTERS　36　(5)　443-445　2000/03

    ISSN： 0013-5194

  568. 640-Gbit/s optical TDM transmission over 92 km through a dispersion-managed fiber consisting of single-mode fiber and "reverse dispersion fiber" Peer-reviewed

    T Yamamoto, E Yoshida, KR Tamura, K Yonenaga, M Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　12　(3)　353-355　2000/03

    DOI： 10.1109/68.826938 　

    ISSN： 1041-1135

  569. Ultrahigh-speed long-distance TDM and WDM soliton transmission technologies Peer-reviewed

    M Nakazawa, H Kubota, K Suzuki, E Yamada, A Sahara

    IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS　6　(2)　363-396　2000/03

    DOI： 10.1109/2944.847771 　

    ISSN： 1077-260X

  570. Ultra high speed and high capacity optical communication

    NAKAZAWA Masataka

    rle　20　163-164　2000/01/01

    Publisher: The Laser Society of Japan

    DOI： 10.2184/lsj.28.Supplement_163 　

    ISSN： 0913-6355

  571. 80 Gbit/s multi-channel soliton transmission over transoceanic distances Invited Peer-reviewed

    M Nakazawa, H Kubota, K Suzuki, E Yamada, A Sahara

    MASSIVE WDM AND TDM SOLITON TRANSMISSION SYSTEMS　6　17-39　2000

  572. Handling noise in supercontinuum generation for WDM application Invited Peer-reviewed

    H Kubota, KR Tamura, M Nakazawa

    MASSIVE WDM AND TDM SOLITON TRANSMISSION SYSTEMS　6　403-410　2000

  573. Simulation method for optical soliton pulse propagation Peer-reviewed

    NAKAZAWA Masataka

    IECO of Japan　83　866-871　2000

  574. Effect of ASE noise on coherence for supercontinuum light source by soliton compression Peer-reviewed

    NAKAZAWA Masataka

    Transaction of IEICE of Japan　J83-C　1005-1011　2000

  575. Analyses of coherence-maintained ultrashort optical pulse trains and supercontinuum generation in the presence of soliton-amplified spontaneous-emission interaction Peer-reviewed

    H Kubota, KR Tamura, M Nakazawa

    JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS　16　(12)　2223-2232　1999/12

    ISSN： 0740-3224

    eISSN： 1520-8540

  576. A 40-GHz 0.9-ps regeneratively mode-locked fiber laser with a tuning range of 1530-1560 nm Peer-reviewed

    E Yoshida, N Shimizu, M Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　11　(12)　1587-1589　1999/12

    DOI： 10.1109/68.806855 　

    ISSN： 1041-1135

  577. A new optical routing technique with a subcarrier clock controlled wavelength converter Peer-reviewed

    KR Tamura, T Komukai, M Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　11　(11)　1491-1493　1999/11

    DOI： 10.1109/68.803089 　

    ISSN： 1041-1135

  578. Recent progress in soliton communication technology(招待講演) Invited Peer-reviewed

    H. Kubota, M. Nakazawa

    NOLTA'99(International Symposium on Nonlinear Theory and its Applications)　1-B-1　1999/11

  579. Single channel 640 Gbit/s TDM transmission over 100 km Invited Peer-reviewed

    T. Yamamoto, E. Yoshida, K. Tamura, M. Nakazawa

    ECOC'99(European Conference on Optical Communication)　II　38-39　1999/09

  580. A new optical routing technique with a subcarrier clock controlled wavelength converter Peer-reviewed

    K. Tamura, T. Komukai, M. Nakazawa

    ECOC'99(European Conference on Optical Communication)　II　126-127　1999/09

  581. 160Gbit/s (80Gbit/s x 2 channels) WDM soliton transmission over 10000 km using in-line synchronous modulation Peer-reviewed

    M Nakazawa, K Suzuki, H Kubota

    ELECTRONICS LETTERS　35　(16)　1358-1359　1999/08

    DOI： 10.1049/el:19990883 　

    ISSN： 0013-5194

  582. Pedestal-free pulse compressor for high repetition rate, broadly tunable femtosecond pulses Peer-reviewed

    K. Tamura, M. Nakazawa

    OAA'99(Optical Amplifier and their Applications)　FA5　1999/06

  583. 10 Gbit/s soliton transmission over 2,9000 km using 1.3_m single-mode fibers and dispersion compensation using chirped fiber Bragg gratings Peer-reviewed

    E. Yamada, T. Imai, T. Komukai, M. Nakazawa

    OAA'99　ThD7　1999/06

  584. Measurement of the timing jitter and pulse energy fluctuation of a PLL regeneratively mode-locked fiber laser Peer-reviewed

    E Yoshida, M Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　11　(5)　548-550　1999/05

    DOI： 10.1109/68.759394 　

    ISSN： 1041-1135

  585. 10Gbit/s soliton transmission over 2900km using 1.3 mu m singlemode fibres and dispersion compensation using chirped fibre Bragg gratings Peer-reviewed

    E Yamada, T Imai, T Komukai, M Nakazawa

    ELECTRONICS LETTERS　35　(9)　728-729　1999/04

    DOI： 10.1049/el:19990412 　

    ISSN： 0013-5194

  586. Ultrahigh speed soliton and non-soliton technologies(招待講演) Invited Peer-reviewed

    M. Nakazawa

    UEO'99(Ultrafast Electronics and Optelectronics)　UThA1　1999/04

  587. Efficient optical pulse compression with optical gain via four wave mixing Peer-reviewed

    T Yamamoto, M Nakazawa

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS　82　(3)　41-50　1999/03

    ISSN： 8756-663X

  588. Random evolution and coherence degradation of a high-order optical soliton train in the presence of noise Peer-reviewed

    M Nakazawa, H Kubota, K Tamura

    OPTICS LETTERS　24　(5)　318-320　1999/03

    ISSN： 0146-9592

  589. Femtosecond soliton generation over a 32-nm wavelength range using a dispersion-flattened dispersion-decreasing fiber Peer-reviewed

    KR Tamura, M Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　11　(3)　319-321　1999/03

    DOI： 10.1109/68.748221 　

    ISSN： 1041-1135

  590. Spectral-smoothing and pedestal reduction of wavelength tunable quasi-adiabatically compressed femtosecond solitons using a dispersion-flattened dispersion-imbalanced loop mirror Peer-reviewed

    KR Tamura, M Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　11　(2)　230-232　1999/02

    DOI： 10.1109/68.740713 　

    ISSN： 1041-1135

  591. Comparison of the dispersion allocated WDM (10 Gbit/s x 10 channels) optical soliton and NRZ systems using a Q map Peer-reviewed

    A Sahara, H Kubota, M Nakazawa

    OPTICS COMMUNICATIONS　160　(1-3)　139-145　1999/02

    DOI： 10.1016/S0030-4018(98)00641-5 　

    ISSN： 0030-4018

  592. Ultra-high speed soliton transmission in presence of polarisation mode dispersion using in-line synchronous modulation Invited Peer-reviewed

    A. Sahara, H. Kubota, M. Nakazawa

    Electronics Letters　35　(1)　76-78　1999/01/07

    Publisher: Institution of Engineering and Technology

    DOI： 10.1049/el:19990043 　

    ISSN： 0013-5194

  593. Preface for Topical Papers on Ultrahigh Speed and Ultrahigh Capacity Optical Communication Technologies

    NAKAZAWA Masataka

    rle　27　(4)　230-230　1999

    Publisher: The Laser Society of Japan

    DOI： 10.2184/lsj.27.230 　

    ISSN： 0387-0200

  594. Ultrashort pulse generation using a mode-locked fiber laser

    Tamura K., Yoshida E., Nakazawa M.

    rle　27　145-146　1999

    Publisher: The Laser Society of Japan

    DOI： 10.2184/lsj.27.Supplement_145 　

    ISSN： 0387-0200

  595. Superb characteristics of dispersion-managed soliton transmission in TDM and WDM systems Peer-reviewed

    M Nakazawa, H Kubota, K Suzuki, E Yamada, A Sahara

    OPTICAL PULSE AND BEAM PROPAGATION　3609　2-13　1999

    ISSN： 0277-786X

  596. A single-frequency and single-polarization fiber ring laser using a 5-GHz fiber Bragg grating Peer-reviewed

    Inaba H, Akimoto Y, Tamura K, Yoshida E, Komukai T, Nakazawa M

    Electronics and Communications in Japan Part Ii-Electronics　82　(5)　21-29　1999

    DOI： 10.1002/(SICI)1520-6432(199905)82:5<21::AID-ECJB3>3.0.CO;2-B 　 10.1002/(sici)1520-6432(199905)82:5<21::aid-ecjb3>3.0.co;2-b 　

  597. Ultra-high speed soliton transmission in presence of polarisation mode dispersion using in-line synchronous modulation Peer-reviewed

    A Sahara, H Kubota, M Nakazawa

    ELECTRONICS LETTERS　35　(1)　76-78　1999/01

    DOI： 10.1049/el:19990043 　

    ISSN： 0013-5194

  598. Terabit transmission technologies Peer-reviewed

    NAKAZAWA Masataka

    NTT R&D Journal Special Issue on Challenges to Terabit/s Communication Technologies　48　43-58　1999

  599. Mode-locked fiber laser technology for ultrahigh-speed TDM optical transmission Peer-reviewed

    NAKAZAWA Masataka

    NTT R&D Journal Special Issue on Challenges to Terabit/s Communication Technologies　48　59-66　1999

  600. Single-channel 80Gbit/s soliton transmission over 10000km using in-line synchronous modulation Peer-reviewed

    M Nakazawa, K Suzuki, H Kubota

    ELECTRONICS LETTERS　35　(2)　162-164　1999/01

    DOI： 10.1049/el:19990044 　

    ISSN： 0013-5194

  601. Demultiplexing of subterabit TDM signal by using ultrafast nonlinear optical loop mirror Peer-reviewed

    NAKAZAWA Masataka

    IEICE of Japan　J82-C-I　109-116　1999

  602. State-of-the-art and future perspectives of time division multiplexing(TDM)high bit rate optical transmission Peer-reviewed

    NAKAZAWA Masataka

    The Review of Laser Engineering　27　(4)　231-239　1999

    Publisher: The Laser Society of Japan

    DOI： 10.2184/lsj.27.231 　

    ISSN： 0387-0200

    More details Close

    This paper reviews state-of-the-art technologies that will play important roles in high bit rate transmissionsystems. To take full advantage of fiber capacity, combined multiplexing of WDM (Wavelength Division Multiplexing) and TDM (Time Division Multiplexing) technologies is recommended. Not only device technologies, but also system-side viewpoints are emphasized in order to clarify the differences between TDM and WDM systems. Linear transmission and nonlinear ones, which includes optical soliton systems are comparedfrom such a viewpoint. Short light pulse sources, electrical and optical time-division multiplexing/demultiplexing, timing extraction, dispersion tolerant coding, equalization for second- and third-order dispersionof dispersion-shifted fiber, and optical soliton transmission technologies are described. This paper predictsthat pursuing increased transmission capacity will result in more combined designs of detailed fiberdispersion and transmitted optical signal parameters.

  603. 40 Gbit/s soliton transmission field experiment using dispersion management Peer-reviewed

    NAKAZAWA Masataka

    The Review of Laser Engineering　27　(4)　268-273　1999

    Publisher: The Laser Society of Japan

    DOI： 10.2184/lsj.27.268 　

    ISSN： 0387-0200

    More details Close

    We report 40 Gbit/s soliton transmission field experiments over 1, 000 km in the Tokyo metropolitan optical loop network. The network consists of dispersion-shifted fibers. We employed a dispersion compensation technique to keep the average dispersion at a small constant value of 0.05 ps/km/nm and this resulted in an error-free 5 ps soliton data transmission over 1, 000 km. When in-line synchronous modulation was employed at 680 km, the transmission distance was extended to 1, 360 km.

  604. Ultrashort pulse generation at high repetition rate from mode-locked fiber lasers Peer-reviewed

    NAKAZAWA Masataka

    The Review of Laser Engineering　27　(4)　274-280　1999

    Publisher: The Laser Society of Japan

    DOI： 10.2184/lsj.27.274 　

    ISSN： 0387-0200

    More details Close

    A stable optical short pulse source with a high repetition rate is very important for realizing future ultrahigh speed optical communication. Of the many potential techniques, an actively mode-locked fiber laser is one of the most attractive sources for generating high quality picosecond pulses at GHz repetition rates. In this paper, we report a regeneratively mode-locked fiber laser which emits a 1-3 ps transform limited pulse at 10 GHz in the 1.53 to 1.55μm wavelength region. This laser can be locked to an external signal by operating a phase-locked loop technique. By using this pulse source and an adiabatic soliton compression technique, a 170 fs pulse train at 10 GHz was generated. Finally, we show the excellent jitter characteristics of the laser.

  605. Design of dispersion equalizers using chirped Bragg gratings Peer-reviewed

    NAKAZAWA Masataka

    IEICE of Japan　J82-C-I　359-369　1999

  606. Mode-locked fiber ring lasers Peer-reviewed

    NAKAZAWA Masataka

    The Review of Laser Engineering　27　(11)　756-761　1999

    Publisher: The Laser Society of Japan

    DOI： 10.2184/lsj.27.756 　

    ISSN： 0387-0200

    More details Close

    Mode-locking of fiber lasers is a useful technique for generating a high quality short pulse. An actively modelocked fiber laser which can emit short pulses at high repetition rates is one of the most attractive sources for realizing ultrahigh speed optical communications. This paper reviews femtosecond pulse generation from passively mode-locked fiber lasers. The fundamental characteristics and stabilization mechanisms of an actively mode-locked fiber laser are discussed. Lasing characteristics of the regeneratively mode-locked fiber in AM and FM operation are described.

  607. The second and third order dispersion compensation of picosecond pulses achieved by combining two nonlinearly chirped fiber Bragg gratings Peer-reviewed

    T. Imai, T. Komukai, M. Nakazawa

    OFC/IOOC 1999 - Optical Fiber Communication Conference and the International Conference on Integrated Optics and Optical Fiber Communication　4　17-19　1999

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI： 10.1109/OFC.1999.765981 　

  608. 40 Gbit/s soliton transmission field experiment over 1,020 km and its extension to 1,360 km using in-line synchronous modulation Peer-reviewed

    A. Sahara, K. Suzuki, H. Kubota, T. Komukai, E. Yamada, T. Imai, K. Tamura, M. Nakazawa

    OFC/IOOC 1999 - Optical Fiber Communication Conference and the International Conference on Integrated Optics and Optical Fiber Communication　3　112-114　1999

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI： 10.1109/OFC.1999.768079 　

  609. Ultra high speed soliton transmission in the presence of polarization mode dispersion using in-line synchronous modulation Peer-reviewed

    A. Sahara, H. Kubota, M. Nakazawa

    OFC/IOOC 1999 - Optical Fiber Communication Conference and the International Conference on Integrated Optics and Optical Fiber Communication　2　38-40　1999

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI： 10.1109/OFC.1999.766324 　

  610. Toward terabit/s single-channel transmission Invited Peer-reviewed

    M. Nakazawa

    OFC/IOOC 1999 - Optical Fiber Communication Conference and the International Conference on Integrated Optics and Optical Fiber Communication　4　132-134　1999

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI： 10.1109/OFC.1999.766017 　

  611. Coherence degradation of a high-order optical soliton train in the presence of noise Peer-reviewed

    H Kubota, KR Tamura, M Nakazawa

    OPTICAL AMPLIFIERS AND THEIR APPLICATIONS　30　364-367　1999

    ISSN： 1094-5695

  612. Handling noise in soliton systems for ultrahigh speed transmission over unlimited distances Invited Peer-reviewed

    M Nakazawa

    OPTICAL AMPLIFIERS AND THEIR APPLICATIONS　30　41-44　1999

    ISSN： 1094-5695

  613. Second- and third-order dispersion compensation of picosecond pulses achieved by combining two nonlinearly chirped fibre Bragg gratings Peer-reviewed

    T Imai, T Komukai, M Nakazawa

    ELECTRONICS LETTERS　34　(25)　2422-2423　1998/12

    DOI： 10.1049/el:19981619 　

    ISSN： 0013-5194

  614. Single channel 40Gbit/s soliton transmission field experiment over 1000km in Tokyo metropolitan optical loop network using dispersion compensation Peer-reviewed

    A Sahara, K Suzuki, H Kubota, T Komukai, E Yamada, T Imai, K Tamura, M Nakazawa

    ELECTRONICS LETTERS　34　(22)　2154-2155　1998/10

    DOI： 10.1049/el:19981454 　

    ISSN： 0013-5194

  615. 40Gbit/s soliton transmission field experiment over 1360km using in-line soliton control Peer-reviewed

    K Suzuki, H Kubota, T Komukai, E Yamada, T Imai, K Tamura, A Sahara, M Nakazawa

    ELECTRONICS LETTERS　34　(22)　2143-2145　1998/10

    DOI： 10.1049/el:19981472 　

    ISSN： 0013-5194

  616. Wavelength tunable 1.0ps pulse generation in 1.530-1.555 mu m region from PLL, regeneratively modelocked fibre laser Peer-reviewed

    E Yoshida, M Nakazawa

    ELECTRONICS LETTERS　34　(18)　1753-1754　1998/09

    DOI： 10.1049/el:19981262 　

    ISSN： 0013-5194

  617. Timing jitter of solitons compressed in dispersion-decreasing fibers Peer-reviewed

    K Tamura, M Nakazawa

    OPTICS LETTERS　23　(17)　1360-1362　1998/09

    ISSN： 0146-9592

  618. Fabrication of non-linearly chirped fiber Bragg gratings for higher-order dispersion compensation Peer-reviewed

    T Komukai, M Nakazawa

    OPTICS COMMUNICATIONS　154　(1-3)　5-8　1998/08

    DOI： 10.1016/S0030-4018(98)00324-1 　

    ISSN： 0030-4018

  619. Mode-locked fiber lasers for optical communications(招待講演) Invited Peer-reviewed

    K. Tamura, E. Yoshida, M. Nakazawa

    OECC'98　16C1-1　1998/08

  620. Time-domain ABCD matrix formalism for laser mode-locking and optical pulse transmission Peer-reviewed

    M Nakazawa, H Kubota, A Sahara, K Tamura

    IEEE JOURNAL OF QUANTUM ELECTRONICS　34　(7)　1075-1081　1998/07

    DOI： 10.1109/3.687847 　

    ISSN： 0018-9197

    eISSN： 1558-1713

  621. Dispersion tuning of a linearly chirped fiber Bragg grating without a center wavelength shift by applying a strain gradient Peer-reviewed

    T Imai, T Komukai, M Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　10　(6)　845-847　1998/06

    DOI： 10.1109/68.681505 　

    ISSN： 1041-1135

  622. Long-phase error-free fiber Bragg gratings Peer-reviewed

    T Komukai, M Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　10　(5)　687-689　1998/05

    DOI： 10.1109/68.669251 　

    ISSN： 1041-1135

    eISSN： 1941-0174

  623. Ultrafast nonlinear optical loop mirror for demultiplexing 640Gbit/s TDM signals Peer-reviewed

    T Yamamoto, E Yoshida, M Nakazawa

    ELECTRONICS LETTERS　34　(10)　1013-1014　1998/05

    DOI： 10.1049/el:19980712 　

    ISSN： 0013-5194

  624. 320Gbit/s TDM transmission over 120 km using 400fs pulse train Peer-reviewed

    E Yoshida, T Yamamoto, A Sahara, M Nakazawa

    ELECTRONICS LETTERS　34　(10)　1004-1005　1998/05

    DOI： 10.1049/el:19980728 　

    ISSN： 0013-5194

  625. TDM single channel 640Gbit/s transmission experiment over 60km using 400fs pulse train and walk-off free, dispersion flattened nonlinear optical loop mirror Peer-reviewed

    M Nakazawa, E Yoshida, T Yamamoto, E Yamada, A Sahara

    ELECTRONICS LETTERS　34　(9)　907-908　1998/04

    DOI： 10.1049/el:19980590 　

    ISSN： 0013-5194

  626. Coherence degradation in the process of supercontinuum generation in an optical fiber Peer-reviewed

    M Nakazawa, K Tamura, H Kubota, E Yoshida

    OPTICAL FIBER TECHNOLOGY　4　(2)　215-223　1998/04

    ISSN： 1068-5200

  627. Ultrafast fiber lasers and their applications to optical communication(招待講演) Invited Peer-reviewed

    M. Nakazawa

    International Workshop on Current Topics of Laser Technology　17-18　1998/03

  628. Forced phase modulation and self phase modulation effects in dispersion-tuned mode-locked fiber lasers Peer-reviewed

    K Tamura, E Yoshida, M Nakazawa

    IEICE TRANSACTIONS ON ELECTRONICS　E81C　(2)　195-200　1998/02

    ISSN： 0916-8524

    eISSN： 1745-1353

  629. Intracavity dispersion effects of a regeneratively and harmonically FM mode-locked erbium-doped fiber laser Peer-reviewed

    E Yoshida, K Tamura, M Nakazawa

    IEICE TRANSACTIONS ON ELECTRONICS　E81C　(2)　189-194　1998/02

    ISSN： 0916-8524

    eISSN： 1745-1353

  630. Fabrication of nonlinearly chirped fiber Bragg gratings for high order dispersion compensation Peer-reviewed

    T. Komukai, M. Nakazawa

    OFC'98　TuM2　1998/02

  631. 40 Gbit/s single-channel optical soliton transmission over 70,000 km using in-line synchronous modulation Peer-reviewed

    K. Suzuki, H. Kubota, A. Sahara, M. Nakazawa

    OFC'98　ThI4　1998/02

  632. TDM single channel 640 Gbit/s transmission experiment over 60 km using a 400 fs pulse train and a walk-off free, dispersion-flattened nonlinear optical loop mirror Peer-reviewed

    M. Nakazawa, E. Yoshida, T. Yamamoto, E. Yamada, A. Sahara

    OFC'98　PD14　1998/02

  633. Experiment and analyses of 20-Gbit/s soliton transmission systems using installed optical fiber cable Peer-reviewed

    A Sahara, H Kubota, M Nakazawa

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS　81　(1)　74-83　1998/01

    ISSN： 8756-663X

  634. Superb characteristics of dispersion-allocated soliton transmission in TDM and WDM systems Invited Peer-reviewed

    M Nakazawa, H Kubota, K Suzuki, E Yamada, A Sahara

    NEW TRENDS IN OPTICAL SOLITON TRANSMISSION SYSTEMS　5　197-224　1998

  635. 160Gbit/s WDM (20Gbit/s x 8 channels) soliton transmission over 10000km using in-line synchronous modulation and optical filtering Peer-reviewed

    M Nakazawa, K Suzuki, H Kubota, A Sahara, E Yamada

    ELECTRONICS LETTERS　34　(1)　103-104　1998/01

    DOI： 10.1049/el:19980100 　

    ISSN： 0013-5194

  636. 40Gbit/s single channel optical soliton transmission over 70000km using in-line synchronous modulation and optical filtering Peer-reviewed

    K Suzuki, H Kubota, A Sahara, M Nakazawa

    ELECTRONICS LETTERS　34　(1)　98-100　1998/01

    DOI： 10.1049/el:19980063 　

    ISSN： 0013-5194

  637. Efficient optical pulse compression with optical gain via four-wave mixing Peer-reviewed

    NAKAZAWA Masataka

    IEICE of Japan　J81-C-I　(3)　148-157　1998

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0915-1893

  638. A single-frequency and single-polarization fiber ring laser using a 5 GHz fiber Bragg grating Peer-reviewed

    NAKAZAWA Masataka

    IEICE of Japan　J81-C-I　(8)　451-459　1998

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0915-1893

  639. Marked increase in power margin through the use of dispersion-allocated soliton and evaluation of transmission characteristics using Q map: Comparison between D-A soliton, NRZ pulse, and RZ pulse at zero GVD Peer-reviewed

    M Nakazawa, A Sahara, H Kubota

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART I-COMMUNICATIONS　80　(12)　17-27　1997/12

    ISSN： 8756-6621

  640. Active optical pulse compression with a gain of 29.0 dB by using four-wave mixing in an optical fiber Peer-reviewed

    T Yamamoto, M Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　9　(12)　1595-1597　1997/12

    DOI： 10.1109/68.643279 　

    ISSN： 1041-1135

    eISSN： 1941-0174

  641. Advantages of dispersion-allocated soliton transmission and its application to conventional 1.3 μm single-mode fiber(招待講演) Invited Peer-reviewed

    H. Kubota, M. Nakazawa

    International Symposium NOLTA'98　M3F　1997/12

  642. A wavelength tunable Q-switched fiber laser using fiber Bragg gratings Peer-reviewed

    T Imai, T Komukai, T Yamamoto, M Nakazawa

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS　80　(11)　12-21　1997/11

    ISSN： 8756-663X

  643. Demultiplexing and routing of TDM signal using wavelength conversion by four-wave mixing and wavelength routing by fiber gratings Peer-reviewed

    T Yamamoto, T Imai, T Komukai, M Nakazawa

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS　80　(10)　28-36　1997/10

    ISSN： 8756-663X

  644. Application of a fiber Bragg grating to spectral filtering Peer-reviewed

    T Komukai, T Yamamoto, T Imai, M Nakazawa

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS　80　(9)　1-9　1997/09

    ISSN： 8756-663X

  645. Low-threshold 115-GHz continuous-wave modulational-instability erbium-doped fiber laser Peer-reviewed

    E Yoshida, M Nakazawa

    OPTICS LETTERS　22　(18)　1409-1411　1997/09

    ISSN： 0146-9592

    eISSN： 1539-4794

  646. Optimum fiber dispersion for two-step dispersion-allocated optical soliton, RZ at zero GVD and NRZ systems Peer-reviewed

    A Sahara, H Kubota, M Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　9　(8)　1179-1181　1997/08

    DOI： 10.1109/68.605543 　

    ISSN： 1041-1135

    eISSN： 1941-0174

  647. Numerical and experimental comparison of soliton, RZ pulse and NRZ pulses under two-step dispersion allocation Peer-reviewed

    M Nakazawa, E Yamada, H Kubota, T Yamamoto, A Sahara

    ELECTRONICS LETTERS　33　(17)　1480-1482　1997/08

    DOI： 10.1049/el:19971001 　

    ISSN： 0013-5194

  648. 100Gbit/s WDM (20Gbit/s x 5 channels) soliton transmission over 10000km using in-line synchronous modulation and optical filtering Peer-reviewed

    M. Nakazawa, K. Suzuki, H. Kubota, A. Sahara, E. Yamada

    Electronics Letters　33　(14)　1233-1234　1997/07/03

    Publisher: Institution of Engineering and Technology

    DOI： 10.1049/el:19970815 　

    ISSN： 0013-5194

  649. Femtosecond fiber laser at 10 GHz and its application as a multi-wavelength optical pulse source Peer-reviewed

    E Yoshida, K Tamura, E Yamada, M Nakazawa

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS　80　(7)　56-63　1997/07

    ISSN： 8756-663X

  650. 100Gbit/s WDM (20Gbit/sx5 channels) soliton transmission over 10000km using in-line synchronous modulation and optical filtering Peer-reviewed

    M Nakazawa, K Suzuki, H Kubota, A Sahara, E Yamada

    ELECTRONICS LETTERS　33　(14)　1233-1234　1997/07

    DOI： 10.1049/el:19970815 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  651. Ideal phase-locked-loop (PLL) operation of a 10GHz erbium-doped fibre laser using regenerative modelocking as an optical voltage controlled oscillator Peer-reviewed

    M Nakazawa, E Yoshida, K Tamura

    ELECTRONICS LETTERS　33　(15)　1318-1320　1997/07

    DOI： 10.1049/el:19970902 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  652. An efficient 0.04-nm apodized fiber Bragg grating and its application to narrow-band spectral filtering Peer-reviewed

    T Komukai, K Tamura, M Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　9　(7)　934-936　1997/07

    DOI： 10.1109/68.593356 　

    ISSN： 1041-1135

    eISSN： 1941-0174

  653. Optical soliton and nonlinear transmission systems(招待講演) Invited Peer-reviewed

    M. Nakazawa

    OECC'97(OptoElectronics and Communication Conference'97)　PA3-1　1997/07

  654. Low Threshold, 115 GHz continuous wave modulational instability erbium-doped fiber laser Peer-reviewed

    E. Yoshida, M. Nakazawa

    OECC'97(OptoElectronics and Communication Conference'97)　PDP2-1　1997/07

  655. Generation and transmission of optical soliton pulses Peer-reviewed

    M Nakazawa, H Kubota, E Yamada

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS　80　(4)　53-66　1997/04

    ISSN： 8756-663X

  656. Fabrication and wavelength tuning of a high-quality fiber Bragg grating Peer-reviewed

    T Komukai, T Yamamoto, T Imai, M Nakazawa

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS　80　(4)　27-34　1997/04

    ISSN： 8756-663X

  657. Highly efficient four-wave mixing in an optical fiber with intensity dependent phase matching Peer-reviewed

    T Yamamoto, M Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　9　(3)　327-329　1997/03

    DOI： 10.1109/68.556062 　

    ISSN： 1041-1135

    eISSN： 1941-0174

  658. 10Gbit/s, 10600km, dispersion-allocated soliton transmission using conventional 1.3 mu m singlemode fibres Peer-reviewed

    E Yamada, H Kubota, T Yamamoto, A Sahara, M Nakazawa

    ELECTRONICS LETTERS　33　(7)　602-603　1997/03

    DOI： 10.1049/el:19970414 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  659. Dispersion-allocated soliton technology and the stretched-pulse mode-locked fiber laser(招待講演) Invited Peer-reviewed

    M. Nakazawa

    OFC'97(Conference on Optical Fiber Communication)　1997/02

  660. 100 Gbit/s(20 Gbit/sx5 channels)soliton transmission over 10,000 km using in-line synchronous modulation and optical filtering Peer-reviewed

    M. Nakazawa, K. Suzuki, H. Kubota, A. Sahara, E. Yamada

    OFC'97　PDP21　1997/02

  661. Numerical and experimental comparison between the dispersion-allocated soliton, RZ and NRZ pulses at zero group velocity dispersion Peer-reviewed

    E Yamada, H Kubota, T Yamamoto, A Sahara, M Nakazawa

    IOOC-ECOC 97 - 11TH INTERNATIONAL CONFERENCE ON INTEGRATED OPTICS AND OPTICAL FIBRE COMMUNICATIONS / 23RD EUROPEAN CONFERENCE ON OPTICAL COMMUNICATIONS, VOL 3　(448)　327-330　1997

    ISSN： 0537-9989

  662. Application of fiber Bragg gratings to spectral filtering Peer-reviewed

    NAKAZAWA Masataka

    IEICE of Japan　J80-C-I　32-40　1997

  663. Optical cable amplifier Peer-reviewed

    NAKAZAWA Masataka

    The Laser Society of Japan, Rev. of Laser Eng.　25　121-125　1997

  664. Femtosecond fiber laser at 10 GHz and its application as a multi-wavelength optical pulse source Peer-reviewed

    NAKAZAWA Masataka

    IEICE of Japan　J80-C-I　70-77　1997

  665. Marked increase in the power margin through the use of dispersion-allocated soliton and evaluation of transmission characteristics using Q mapping-Comparison between D-A soliton, NRZ pulse and RZ pulse at zero GVD- Peer-reviewed

    NAKAZAWA Masataka

    IEICE of Japan　J80-B-I　148-158　1997

  666. Demutliplexing and routing of TDM signal using wavelength conversion by fiber four-wave mixing and wavelength routing by fiber gratings Peer-reviewed

    NAKAZAWA Masataka

    IEICE of Japan　J80-C-I　186-194　1997

  667. Wavelength tunable Q-switched fiber laser using fiber Bragg gratings Peer-reviewed

    NAKAZAWA Masataka

    IEICE of Japan　J80-C-I　(5)　195-203　1997

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0915-1893

  668. Experiments and analyses of 20 Gbit/s soliton transmission systems using installed optical fiber cables Peer-reviewed

    NAKAZAWA Masataka

    IEICE of Japan　J80-C-I　204-212　1997

  669. Advantages of dispersion-allocated soliton by comparison with conventional NRZ and RZ pulse transmission at zero GVD Peer-reviewed

    NAKAZAWA Masataka

    TOPS, OSA　12　299-304　1997

  670. Recent progress in optical soliton communication and its future prospects-Analogy between optical pulse transmission and laser mode-locking Peer-reviewed

    NAKAZAWA Masataka

    Journal of Applied Physics　66　(9)　922-932　1997

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/oubutsu1932.66.922 　

    ISSN： 0369-8009

  671. Dispersion-tuned harmonically mode-locked fiber ring laser for self-synchronization to an external clock Peer-reviewed

    K Tamura, M Nakazawa

    OPTICS LETTERS　21　(24)　1984-1986　1996/12

    DOI： 10.1364/OL.21.001984 　

    ISSN： 0146-9592

    eISSN： 1539-4794

  672. Pulse energy equalization in harmonically FM mode-locked losers with slow gain Peer-reviewed

    K Tamura, M Nakazawa

    OPTICS LETTERS　21　(23)　1930-1932　1996/12

    DOI： 10.1364/OL.21.001930 　

    ISSN： 0146-9592

    eISSN： 1539-4794

  673. Recent progress in optical soliton communication(招待講演) Invited Peer-reviewed

    M. Nakazawa

    International Symposium on Solitons　1996/12

  674. Fabrication of high-quality long-fiber Bragg grating by monitoring 3.1-eV radiation (400 nm) from GeO defects Peer-reviewed

    T Komukai, M Nakazawa

    IEEE PHOTONICS TECHNOLOGY LETTERS　8　(11)　1495-1497　1996/11

    DOI： 10.1109/68.541561 　

    ISSN： 1041-1135

    eISSN： 1941-0174

  675. Ultra-high speed mode-locked fiber lasers in the pico-femtosecond region(招待講演) Invited Peer-reviewed

    E. Yoshida, M. Nakazawa

    ROSC'96　1996/11

  676. A wavelength tunable Q-switched erbium-doped fiber laser with fiber Bragg grating mirrors Peer-reviewed

    T Imai, T Komukai, T Yamamoto, M Nakazawa

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS　35　(10A)　L1275-L1277　1996/10

    DOI： 10.1143/jjap.35.L1275 　

    ISSN： 0021-4922

  677. Optimization of power extraction in a high-power soliton fiber ring laser containing a chirped fiber grating Peer-reviewed

    K Tamura, T Komukai, M Nakazawa

    APPLIED PHYSICS LETTERS　69　(11)　1535-1537　1996/09

    DOI： 10.1063/1.117996 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  678. Generation of 10GHz pulse trains at 16 wavelengths by spectrally slicing a high power femtosecond source Peer-reviewed

    K Tamura, E Yoshida, M Nakazawa

    ELECTRONICS LETTERS　32　(18)　1691-1693　1996/08

    DOI： 10.1049/el:19961119 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  679. 60Gbit/s WDM (20 Gbit/s x 3 unequally spaced channels) soliton transmission over 10000 km using in-line synchronous modulation and optical filtering Peer-reviewed

    M Nakazawa, K Suzuki, H Kubota, E Yamada

    ELECTRONICS LETTERS　32　(18)　1686-1688　1996/08

    DOI： 10.1049/el:19961152 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  680. Marked increase in the power margin through the use of a dispersion-allocated soliton Peer-reviewed

    M Nakazawa, H Kubota, A Sahara, K Tamura

    IEEE PHOTONICS TECHNOLOGY LETTERS　8　(8)　1088-1090　1996/08

    DOI： 10.1109/68.508747 　

    ISSN： 1041-1135

    eISSN： 1941-0174

  681. Dispersion-allocated soliton transmission(招待講演) Invited Peer-reviewed

    M. Nakazawa, H. Kubota, A. Sahara

    2nd International Workshop for Soliton Communication　1996/08

  682. 80-200GHz erbium doped fibre laser using a rational harmonic mode-locking technique Peer-reviewed

    E. Yoshida, M. Nakazawa

    Electronics Letters　32　(15)　1370-1372　1996/07/18

    Publisher: Institution of Engineering and Technology

    DOI： 10.1049/el:19960896 　

    ISSN： 0013-5194

  683. 10GHz, 2ps regeneratively and harmonically FM mode-locked erbium fibre ring laser Peer-reviewed

    M Nakazawa, E Yoshida, K Tamura

    ELECTRONICS LETTERS　32　(14)　1285-1287　1996/07

    DOI： 10.1049/el:19960838 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  684. Direct generation of a 750fs, 10GHz pulse train from a regeneratively mode-locked fibre laser with multiple harmonic modulation Peer-reviewed

    M Nakazawa, E Yoshida

    ELECTRONICS LETTERS　32　(14)　1291-1293　1996/07

    DOI： 10.1049/el:19960825 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  685. 80 similar to 200GHz erbium doped fibre laser using a rational harmonic mode-locking technique Peer-reviewed

    E Yoshida, M Nakazawa

    ELECTRONICS LETTERS　32　(15)　1370-1372　1996/07

    DOI： 10.1049/el:19960896 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  686. A repetition-rate stabilized and tunable, regeneratively mode-locked fiber laser using an offset-locking technique Peer-reviewed

    M Nakazawa, E Yoshida, E Yamada, Y Kimura

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS　35　(6A)　L691-L694　1996/06

    DOI： 10.1143/JJAP.35.L691 　

    ISSN： 0021-4922

  687. NOLM oscillator and its injection locking technique for timing clock extraction and demultiplexing Peer-reviewed

    M Nakazawa, K Suzuki, E Yamada

    ELECTRONICS LETTERS　32　(12)　1122-1123　1996/06

    DOI： 10.1049/el:19960749 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  688. Q-factor contour mapping for evaluation of optical transmission systems: Soliton against NRZ against RZ pulse at zero group velocity dispersion Peer-reviewed

    A Sahara, H Kubota, M Nakazawa

    ELECTRONICS LETTERS　32　(10)　915-916　1996/05

    DOI： 10.1049/el:19960590 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  689. 40 Gbit/s WDM (10Gbit/sx4 unequally spaced channels) soliton transmission over 10000 km using synchronous modulation and narrow band optical filtering Peer-reviewed

    M Nakazawa, K Suzuki, H Kubota, Y Kimura, E Yamada, K Tamura, T Komukai, T Imai

    ELECTRONICS LETTERS　32　(9)　828-830　1996/04

    DOI： 10.1049/el:19960543 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  690. Generation of a 0.5 W average power train of femtosecond pulses at 10 GHz in the 1.55 mu m region Peer-reviewed

    K Tamura, E Yoshida, E Yamada, M Nakazawa

    ELECTRONICS LETTERS　32　(9)　835-836　1996/04

    DOI： 10.1049/el:19960528 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  691. Soliton transmission field experiment Peer-reviewed

    H Kubota, M Nakazawa

    NTT REVIEW　8　(2)　65-71　1996/03

    ISSN： 0915-2334

  692. Nonlinear pulse transmission through an optical fiber at zero-average group velocity dispersion Peer-reviewed

    M Nakazawa, H Kubota, K Tamura

    IEEE PHOTONICS TECHNOLOGY LETTERS　8　(3)　452-454　1996/03

    DOI： 10.1109/68.481147 　

    ISSN： 1041-1135

    eISSN： 1941-0174

  693. Telecommunications rides a new wave Peer-reviewed

    M Nakazawa

    PHOTONICS SPECTRA　30　(2)　97-+　1996/02

    ISSN： 0731-1230

  694. Supermode noise suppression in a harmonically modelocked fibre laser by selfphase modulation and spectral filtering Peer-reviewed

    M Nakazawa, K Tamura, E Yoshida

    ELECTRONICS LETTERS　32　(5)　461-463　1996/02

    DOI： 10.1049/el:19960318 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  695. Optical soliton transmission technology

    Nakazawa Masataka

    rle　24　283-287　1996

    Publisher: The Laser Society of Japan

    DOI： 10.2184/lsj.24.Supplement_283 　

    ISSN： 0387-0200

  696. A dispersion-allocated soliton and its impact on soliton communication Invited Peer-reviewed

    H Kubota, M Nakazawa

    PHYSICS AND APPLICATIONS OF OPTICAL SOLITONS IN FIBRES '95　3　27-36　1996

  697. Pulse compression by nonlinear pulse evolution with reduced optical wave breaking in erbium-doped fiber amplifiers Peer-reviewed

    K Tamura, M Nakazawa

    OPTICS LETTERS　21　(1)　68-70　1996/01

    DOI： 10.1364/OL.21.000068 　

    ISSN： 0146-9592

    eISSN： 1539-4794

  698. Recent progress in ultra-high speed optical soliton communication Peer-reviewed

    NAKAZAWA Masataka

    IEICE of Japan　79　259-271　1996

  699. Recent progress in long-distance soliton communication Peer-reviewed

    NAKAZAWA Masataka

    Laser Society of Japan, Rev. of Laser Eng.　24　(6)　633-640　1996

    Publisher: The Laser Society of Japan

    DOI： 10.2184/lsj.24.633 　

    ISSN： 0387-0200

    More details Close

    Current progress on long-distance soliton transmission technologies is summarized, in which the use of erbium-doped fiber amplifiers has been a major breakthrough for the soliton communication. Techniques which can send solitons over unlimited distance are described, in which soliton control in time and frequency domains plays an important role as an optical 3R repeater. Finally, a new soliton transmission technique which employs dispersion allocation is described, which enables us to bring the soliton transmission into a developmental stage.

  700. Generation and transmission of optical soliton pulses Peer-reviewed

    NAKAZAWA Masataka

    IEICE of Japan　J79-C-I　265-277　1996

  701. Fabrication of high quality fiber Bragg grating and its wavelength tuning Peer-reviewed

    NAKAZAWA Masataka

    IEICE of Japan　J79-C-1　(11)　413-419　1996

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0915-1893

  702. 60Gbit/s WDM (20Gbit/s × 3 unequally spaced channels) soliton transmission over 10000km using in-line synchronous modulation and optical filtering Peer-reviewed

    M. Nakazawa, K. Suzuki, H. Kubota, E. Yamada

    Electronics Letters　32　(18)　1686-1688　1996

    Publisher: Institution of Engineering and Technology

    DOI： 10.1049/el:19961152 　

    ISSN： 0013-5194

  703. 60Gbit/s WDM (20Gbit/s × 3 unequally spaced channels) soliton transmission over 10000km using in-line synchronous modulation and optical filtering Invited Peer-reviewed

    M. Nakazawa, K. Suzuki, H. Kubota, E. Yamada

    Electronics Letters　32　(18)　1686-1688　1996

    Publisher: Institution of Engineering and Technology

    DOI： 10.1049/el:19961152 　

    ISSN： 0013-5194

  704. Ultrahigh speed picosecond-femtosecond fiber lasers Peer-reviewed

    E Yoshida, Y Kimura, M Nakazawa

    OPTOELECTRONICS-DEVICES AND TECHNOLOGIES　10　(4)　531-542　1995/12

    ISSN： 0912-5434

  705. Optimizing power extraction in stretched-pulse fiber ring lasers Peer-reviewed

    K Tamura, M Nakazawa

    APPLIED PHYSICS LETTERS　67　(25)　3691-3693　1995/12

    DOI： 10.1063/1.115351 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  706. High energy, sub-picosecond pulse compression at 10GHz using a fibre fibre-grating pulse compressor Peer-reviewed

    K Tamura, T Komukai, T Yamamoto, T Imai, E Yoshida, M Nakazawa

    ELECTRONICS LETTERS　31　(25)　2194-2195　1995/12

    DOI： 10.1049/el:19951472 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  707. 80-160 Gbit/s ultrahigh Speed Soliton Transmission and Related Soliton Technology(招待講演) Invited Peer-reviewed

    K. Suzuki, M. Nakazawa

    20th Australian Conference on Optical Fibre Technology, ACOFT'95　347-350　1995/12

  708. Recent progress in soliton communication(招待講演) Invited Peer-reviewed

    H. Kubota, M. Nakazawa

    International Symposium on Nonlinear Theory and its Application, NOLTA'95　G-4　1995/12

  709. HIGH-SPEED OPTICAL-PATH ROUTING BY USING 4-WAVE-MIXING AND A WAVELENGTH ROUTER WITH FIBER GRATINGS AND OPTICAL CIRCULATORS Peer-reviewed

    T YAMAMOTO, T IMAI, T KOMUKAI, Y MIYAJIMA, M NAKAZAWA

    OPTICS COMMUNICATIONS　120　(5-6)　245-248　1995/11

    DOI： 10.1016/0030-4018(95)00436-C 　

    ISSN： 0030-4018

  710. Recent progress in femtosecond fiber lasers(招待講演) Invited Peer-reviewed

    E. Yoshida, M. Nakazawa

    9th international symposium on ultrafast processes in spectroscopy, UPS'95　MC3　1995/11

  711. EFFICIENT FIBER GRATINGS FORMED ON HIGH NA DISPERSION-SHIFTED FIBER AND DISPERSION-FLATTENED FIBER Peer-reviewed

    T KOMUKAI, M NAKAZAWA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS　34　(10A)　L1286-L1287　1995/10

    DOI： 10.1143/jjap.34.L1286 　

    ISSN： 0021-4922

  712. OPTICAL CABLE AMPLIFIERS Peer-reviewed

    M NAKAZAWA, Y KIMURA

    ELECTRONICS LETTERS　31　(20)　1744-1745　1995/09

    DOI： 10.1049/el:19951173 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  713. A NOVEL TECHNIQUE FOR MEASURING GROUP-VELOCITY DISPERSION OF AN INSTALLED ULTRALONG FIBER BY USING ERBIUM-DOPED FIBER AMPLIFIERS Peer-reviewed

    M NAKAZAWA, A SAHARA, T IMAI, T YAMAMOTO, E YAMADA, Y KIMURA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS　34　(9A)　L1167-L1169　1995/09

    DOI： 10.1143/jjap.34.L1167 　

    ISSN： 0021-4922

  714. BROAD-BAND LIGHT GENERATION BY FEMTOSECOND PULSE AMPLIFICATION WITH STIMULATED RAMAN-SCATTERING IN A HIGH-POWER ERBIUM-DOPED FIBER AMPLIFIER Peer-reviewed

    K TAMURA, E YOSHIDA, T SUGAWA, M NAKAZAWA

    OPTICS LETTERS　20　(15)　1631-1633　1995/08

    ISSN： 0146-9592

    eISSN： 1539-4794

  715. GENERATION OF TERABIT PER SECOND OPTICAL-DATA PULSE-TRAIN Peer-reviewed

    E YAMADA, E YOSHIDA, T KITOH, M NAKAZAWA

    ELECTRONICS LETTERS　31　(16)　1342-1344　1995/08

    DOI： 10.1049/el:19950922 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  716. SOLITON TRANSMISSION AT 20 GBIT/S OVER 2000 KM IN TOKYO METROPOLITAN OPTICAL NETWORK Peer-reviewed

    M NAKAZAWA, Y KIMURA, K SUZUKI, H KUBOTA, T KOMUKAI, E YAMADA, T SUGAWA, E YOSHIDA, T YAMAMOTO, T IMAI, A SAHARA, O YAMAUCHI, M UMEZAWA

    ELECTRONICS LETTERS　31　(17)　1478-1479　1995/08

    DOI： 10.1049/el:19950967 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  717. POLARIZATION DEPENDENCE OF FEMTOSECOND SOLITON-SOLITON INTERACTIONS IN DISPERSION-SHIFTED FIBER Peer-reviewed

    T SUGAWA, H KUBOTA, M NAKAZAWA

    OPTICS LETTERS　20　(13)　1453-1455　1995/07

    ISSN： 0146-9592

    eISSN： 1539-4794

  718. ANALYSES OF THE DISPERSION-ALLOCATED BRIGHT AND DARK SOLITONS Peer-reviewed

    M NAKAZAWA, H KUBOTA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS　34　(7B)　L889-L891　1995/07

    DOI： 10.1143/jjap.34.L889 　

    ISSN： 0021-4922

  719. FIELD DEMONSTRATION OF SOLITON TRANSMISSION AT 10GBIT/S OVER 2000KM IN TOKYO METROPOLITAN OPTICAL LOOP NETWORK Peer-reviewed

    M NAKAZAWA, Y KIMURA, K SUZUKI, H KUBOTA, T KOMUKAI, E YAMADA, T SUGAWA, E YOSHIDA, T YAMAMOTO, T IMAI, A SAHARA, H NAKAZAWA, O YAMAUCHI, M UMEZAWA

    ELECTRONICS LETTERS　31　(12)　992-994　1995/06

    DOI： 10.1049/el:19950680 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  720. CONSTRUCTION OF A DISPERSION-ALLOCATED SOLITON TRANSMISSION-LINE USING CONVENTIONAL DISPERSION-SHIFTED NONSOLITON FIBERS Peer-reviewed

    M NAKAZAWA, H KUBOTA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS　34　(6A)　L681-L683　1995/06

    DOI： 10.1143/jjap.34.L681 　

    ISSN： 0021-4922

  721. FEMTOSECOND PULSE GENERATION OVER 82NM WAVELENGTH SPAN FROM PASSIVELY MODELOCKED ERBIUM-DOPED FIBER LASER Peer-reviewed

    K TAMURA, Y KIMURA, M NAKAZAWA

    ELECTRONICS LETTERS　31　(13)　1062-1063　1995/06

    DOI： 10.1049/el:19950709 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  722. 10GBIT/S PSEUDORANDOM DARK SOLITON DATA-TRANSMISSION OVER 1200KM Peer-reviewed

    M NAKAZAWA, K SUZUKI

    ELECTRONICS LETTERS　31　(13)　1076-1077　1995/06

    DOI： 10.1049/el:19950701 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  723. GENERATION OF A PSEUDORANDOM DARK SOLITON DATA TRAIN AND ITS COHERENT DETECTION BY ONE-BIT-SHIFTING WITH A MACH-ZEHNDER INTERFEROMETER Peer-reviewed

    M NAKAZAWA, K SUZUKI

    ELECTRONICS LETTERS　31　(13)　1084-1085　1995/06

    DOI： 10.1049/el:19950700 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  724. TUNABLE SINGLE-FREQUENCY ERBIUM-DOPED FIBER RING LASERS USING FIBER GRATING ETALONS Peer-reviewed

    T KOMUKAI, M NAKAZAWA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS　34　(6A)　L679-L680　1995/06

    DOI： 10.1143/jjap.34.L679 　

    ISSN： 0021-4922

  725. Ultrahigh Speed optical soliton communication and related technology(招待講演) Invited Peer-reviewed

    M. Nakazawa

    10th International Conference on Integrated Optics and Optical Fibre Communication, IOOC'95　FD2-1　1995/06

  726. Optical demultiplexing and routing of TDM signal by using four-wave mixing and a novel wavelength router with optical circulators and fiber gratings Peer-reviewed

    T. Yamamoto, T. Imai, T. Komukai, Y. Miyajima, M. Nakazawa

    10th International Conference on Integrated Optics and Optical Fibre Communication, IOOC'95　WB3-2　1995/06

  727. Generation of femtosecond pulse train at 20 GHz using an erbium-doped fibre laser and a dispersion-decreasing erbium-doped fibre amplifier Peer-reviewed

    E. Yoshida, Y. Kimura, M. Nakazawa

    10th International Conference on Integrated Optics and Optical Fibre Communication, IOOC'95　ThA1-1　1995/06

  728. FIELD DEMONSTRATION OF SOLITON TRANSMISSION AT 10GBIT/S OVER 2000KM IN TOKYO METROPOLITAN OPTICAL LOOP NETWORK Peer-reviewed

    M NAKAZAWA, Y KIMURA, K SUZUKI, H KUBOTA, T KOMUKAI, E YAMADA, T SUGAWA, E YOSHIDA, T YAMAMOTO, T IMAI, A SAHARA, H NAKAZAWA, O YAMAUCHI, M UMEZAWA

    ELECTRONICS LETTERS　31　(12)　992-994　1995/06

    ISSN： 0013-5194

    eISSN： 1350-911X

  729. 10 Gb/s pseudorandom dark soliton transmission over 1200 km using new coding and detection schemes with supression of stimulated Brillouin scattering Peer-reviewed

    M. Nakazawa, K. Suzuki

    10th International Conference on Integrated Optics and Optical Fibre Communication, IOOC'95　PD2-2　1995/06

  730. Optical demultiplexing and routing of a TDM signal by using four-wave mixing and a novel wavelength router with optical circulators and fibre gratings Invited Peer-reviewed

    T. Yamamoto, T. Imai, T. Komukai, Y. Miyajima, M. Nakazawa

    Electronics Letters　31　(9)　744-745　1995/04/27

    DOI： 10.1049/el:19950479 　

    ISSN： 0013-5194

  731. OPTICAL DEMULTIPLEXING AND ROUTING OF A TDM SIGNAL BY USING 4-WAVE-MIXING AND A NOVEL WAVELENGTH ROUTER WITH OPTICAL CIRCULATORS AND FIBER GRATINGS Peer-reviewed

    T YAMAMOTO, T IMAI, T KOMUKAI, Y MIYAJIMA, M NAKAZAWA

    ELECTRONICS LETTERS　31　(9)　744-745　1995/04

    DOI： 10.1049/el:19950479 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  732. IN-LINE FIBER GRATING-TYPE OPTICAL BANDPASS FILTER TUNED BY APPLYING LATERAL STRESS Peer-reviewed

    T KOMUKAI, Y MIYAJIMA, M NAKAZAWA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS　34　(3A)　L306-L308　1995/03

    DOI： 10.1143/jjap.34.L306 　

    ISSN： 0021-4922

  733. 20GHZ, 1.8PS PULSE GENERATION FROM A REGENERATIVELY MODELOCKED ERBIUM-DOPED FIBER LASER AND ITS FEMTOSECOND PULSE-COMPRESSION Peer-reviewed

    E YOSHIDA, Y KIMURA, M NAKAZAWA

    ELECTRONICS LETTERS　31　(5)　377-378　1995/03

    DOI： 10.1049/el:19950231 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  734. 160GBIT/S SOLITON DATA-TRANSMISSION OVER 200KM Peer-reviewed

    M NAKAZAWA, K SUZUKI, E YOSHIDA, E YAMADA, T KITOH, M KAWACHI

    ELECTRONICS LETTERS　31　(7)　565-566　1995/03

    DOI： 10.1049/el:19950405 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  735. Polarization dependence of soliton interactions and soliton self-frequency shift in a femtosecond soliton transmission Peer-reviewed

    T. Sugawa, K. Kurokawa, H. Kubota, M. Nakazawa

    Conference on Optical Fiber Communication, OFC'95　FB1　1995/03

  736. OPTICAL SOLITON COMMUNICATION IN A POSITIVELY AND NEGATIVELY DISPERSION-ALLOCATED OPTICAL-FIBER TRANSMISSION-LINE Peer-reviewed

    M NAKAZAWA, H KUBOTA

    ELECTRONICS LETTERS　31　(3)　216-217　1995/02

    DOI： 10.1049/el:19950159 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  737. AN IN-LINE OPTICAL BANDPASS FILTER WITH FIBER GRATINGS AND AN OPTICAL CIRCULATOR AND ITS APPLICATION TO PULSE-COMPRESSION Peer-reviewed

    T KOMUKAI, Y MIYAJIMA, M NAKAZAWA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS　34　(2B)　L230-L232　1995/02

    DOI： 10.1143/jjap.34.L230 　

    ISSN： 0021-4922

  738. SOLITON TRANSMISSION CONTROL FOR ULTRA-HIGH-SPEED SYSTEM Peer-reviewed

    H KUBOTA, M NAKAZAWA

    IEICE TRANSACTIONS ON ELECTRONICS　E78C　(1)　5-11　1995/01

    ISSN： 0916-8524

    eISSN： 1745-1353

  739. POLARIZATION DEPENDENCE OF SOLITON-INTERACTIONS IN FEMTOSECOND SOLITON TRANSMISSION Peer-reviewed

    T SUGAWA, K KUROKAWA, H KUBOTA, M NAKAZAWA

    IEICE TRANSACTIONS ON ELECTRONICS　E78C　(1)　28-37　1995/01

    ISSN： 0916-8524

    eISSN： 1745-1353

  740. Recent Progress in Optical Soliton Communication Peer-reviewed

    Kazunori Suzuki, Masataka Nakazawa

    Optical Fiber Technology　1　(4)　289-308　1995

    DOI： 10.1006/ofte.1995.1021 　

    ISSN： 1068-5200

  741. Efficient fiber gratings formed on high NA dispersion-shifted fibers Peer-reviewed

    T Komukai, M Nakazawa

    21ST EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION - ECOC '95, VOLS 1-4　31-34　1995

  742. SUBPICOSECOND OPTICAL DEMULTIPLEXING AT 10-GHZ WITH ZERO-DISPERSION, DISPERSION-FLATTENED, NONLINEAR FIBER LOOP MIRROR CONTROLLED BY 500FS GAIN-SWITCHED LASER-DIODE Peer-reviewed

    E YAMADA, K SUZUKI, M NAKAZAWA

    ELECTRONICS LETTERS　30　(23)　1966-1968　1994/11

    DOI： 10.1049/el:19941352 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  743. SOLITON SELF-FREQUENCY SHIFT IN ORTHOGONALLY POLARIZED FEMTOSECOND SOLITONS Peer-reviewed

    T SUGAWA, K KUROKAWA, H KUBOTA, M NAKAZAWA

    ELECTRONICS LETTERS　30　(23)　1963-1965　1994/11

    DOI： 10.1049/el:19941337 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  744. GENERATION OF A 170FS, 10GHZ TRANSFORM-LIMITED PULSE-TRAIN AT 1.55-MU-M USING A DISPERSION-DECREASING, ERBIUM-DOPED ACTIVE SOLITON COMPRESSOR Peer-reviewed

    M NAKAZAWA, E YOSHIDA, H KUBOTA, Y KIMURA

    ELECTRONICS LETTERS　30　(24)　2038-2040　1994/11

    DOI： 10.1049/el:19941363 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  745. SUBPICOSECOND OPTICAL DEMULTIPLEXING AT 10-GHZ WITH ZERO-DISPERSION, DISPERSION-FLATTENED, NONLINEAR FIBER LOOP MIRROR CONTROLLED BY 500FS GAIN-SWITCHED LASER-DIODE Peer-reviewed

    E YAMADA, K SUZUKI, M NAKAZAWA

    ELECTRONICS LETTERS　30　(23)　1966-1968　1994/11

    ISSN： 0013-5194

    eISSN： 1350-911X

  746. FEMTOSECOND ERBIUM-DOPED FIBER LASER WITH NONLINEAR POLARIZATION ROTATION AND ITS SOLITON COMPRESSION Peer-reviewed

    E YOSHIDA, Y KIMURA, M NAKAZAWA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS　33　(10)　5779-5783　1994/10

    DOI： 10.1143/JJAP.33.5779 　

    ISSN： 0021-4922

  747. GENERATION OF 1.2PS, 10GHZ PULSE-TRAIN FROM ALL-OPTICALLY MODELOCKED, ERBIUM FIBER RING LASER WITH ACTIVE NONLINEAR POLARIZATION ROTATION Peer-reviewed

    EJ GREER, Y KIMURA, K SUZUKI, E YOSHIDA, M NAKAZAWA

    ELECTRONICS LETTERS　30　(21)　1764-1765　1994/10

    DOI： 10.1049/el:19941215 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  748. 80GBIT/S SOLITON DATA-TRANSMISSION OVER 500KM WITH UNEQUAL AMPLITUDE SOLITONS FOR TIMING CLOCK EXTRACTION Peer-reviewed

    M NAKAZAWA, E YOSHIDA, E YAMADA, K SUZUKI, T KITOH, M KAWACHI

    ELECTRONICS LETTERS　30　(21)　1777-1778　1994/10

    DOI： 10.1049/el:19941207 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  749. FEMTOSECOND SOLITON-INTERACTIONS IN A DISTRIBUTED ERBIUM-DOPED FIBER AMPLIFIER Peer-reviewed

    K KUROKAWA, H KUBOTA, M NAKAZAWA

    IEEE JOURNAL OF QUANTUM ELECTRONICS　30　(9)　2220-2226　1994/09

    DOI： 10.1109/3.309886 　

    ISSN： 0018-9197

    eISSN： 1558-1713

  750. ULTRASTABLE HARMONICALLY AND REGENERATIVELY MODE-LOCKED POLARIZATION-MAINTAINING ERBIUM FIBER RING LASER Peer-reviewed

    M NAKAZAWA, E YOSHIDA, Y KIMURA

    ELECTRONICS LETTERS　30　(19)　1603-1605　1994/09

    DOI： 10.1049/el:19941072 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  751. Gain and Noise Characteristics of a 48 km-Long, Dispersion-Shifted, Distributed Erbium-Doped Fiber Amplifier with High Power Transmission Signals Peer-reviewed

    Y. Kimura, M. Nakazawa

    20th European Conference on Optical Communication, ECOC'94　963-967　1994/09

  752. Single-polarization 80 Gbit/s soliton data transmission over 500 km with unequal amplitude solitons for timing clock extraction Peer-reviewed

    M. Nakazawa, E. Yoshida, E. Yamada, K. Suzuki, T. Kitoh, M. Kawachi

    20th European Conference on Optical Communication, ECOC'94　41-44　1994/09

  753. REDUCTION OF AMPLIFIED SPONTANEOUS EMISSION FROM A TRANSMITTED SOLITON SIGNAL USING A NONLINEAR AMPLIFYING LOOP MIRROR AND A NONLINEAR-OPTICAL LOOP MIRROR Peer-reviewed

    E YAMADA, M NAKAZAWA

    IEEE JOURNAL OF QUANTUM ELECTRONICS　30　(8)　1842-1850　1994/08

    DOI： 10.1109/3.301648 　

    ISSN： 0018-9197

    eISSN： 1558-1713

  754. STRAIGHT-LINE SOLITON DATA-TRANSMISSION AT 20GBIT/S BEYOND GORDON-HAUS LIMIT Peer-reviewed

    M NAKAZAWA, K SUZUKI, H KUBOTA, E YAMADA, Y KIMURA

    ELECTRONICS LETTERS　30　(16)　1331-1333　1994/08

    DOI： 10.1049/el:19940915 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  755. 52 Femtosecond Pulse Generation using an Erbium-Doped Fiber Laser with a Pulse Compression Technique Peer-reviewed

    E. Yoshida, Y. Kimura, M. Nakazawa

    5th Optoelectronics Conference, OEC'94　13B1-2　1994/07

  756. 20 Gbit/s-3000 km Straight-Line Soliton Transmission Beyond Gordon-Haus Limit Peer-reviewed

    M. Nakazawa, K. Suzuki, H. Kubota, E. Yamada, Y. Kimura

    5th Optoelectronics Conference, OEC'94　PDI-3　1994/07

  757. SOLITON TRANSMISSION IN TELECOMMUNICATION NETWORKS Peer-reviewed

    M NAKAZAWA

    IEEE COMMUNICATIONS MAGAZINE　32　(3)　34-41　1994/03

    DOI： 10.1109/35.267439 　

    ISSN： 0163-6804

  758. Ultra-high Speed Optical Soliton Communication(招待講演) Invited Peer-reviewed

    M. Nakazawa

    International Workshop on Femtosecond Technology, FST'94　1994/02

  759. Possibility of sub-Terabit soliton transmission using soliton control Invited Peer-reviewed

    H. Kubota, M. Nakazawa

    Optical Fiber Communication, OFC'94　WM1　1994/02

  760. OPTICAL SOLITON COMMUNICATION-SYSTEM USING ERBIUM-DOPED FIBER AMPLIFIERS Peer-reviewed

    K SUZUKI, E YAMADA, H KUBOTA, M NAKAZAWA

    FIBER AND INTEGRATED OPTICS　13　(1)　45-64　1994

    DOI： 10.1080/01468039408202221 　

    ISSN： 0146-8030

    eISSN： 1096-4681

  761. Ultrahigh speed optical soliton communication(招待論文) Peer-reviewed

    NAKAZAWA Masataka

    O plus E　177　53-64　1994

  762. Recent Progress in Optical Soliton Communication (Invited). Invited Peer-reviewed

    中沢正隆

    電子情報通信学会技術研究報告　94　(228(LQE94 33-42))　TuC1-1　1994

    ISSN： 0913-5685

  763. High-speed optical soliton communication using erbium-doped fiber amplifier and soliton transmission control(招待講演) Invited Peer-reviewed

    M. Nakazawa

    1993 International Symposium on Nonlinear Theory and its Applications, NOLTA'93　7.8　1993/12

  764. ACTIVE Q-SWITCHING AND MODE-LOCKING IN A 1.53-MU-M FIBER RING LASER WITH SATURABLE ABSORPTION IN ERBIUM-DOPED FIBER AT 4.2-K Peer-reviewed

    M NAKAZAWA, K SUZUKI, H KUBOTA, Y KIMURA

    OPTICS LETTERS　18　(18)　1526-1528　1993/09

    ISSN： 0146-9592

    eISSN： 1539-4794

  765. SOLITON TRANSMISSION WITH LONG AMPLIFIER SPACING UNDER SOLITON CONTROL Peer-reviewed

    H KUBOTA, M NAKAZAWA

    ELECTRONICS LETTERS　29　(20)　1780-1781　1993/09

    DOI： 10.1049/el:19931185 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  766. Ultrahigh-speed optical soliton communication and soliton transmission control(招待講演) Invited Peer-reviewed

    M. Nakazawa

    Nonlinear Guided-wave phenomena　TuA1　1993/09

  767. STRAIGHT-LINE SOLITON DATA TRANSMISSIONS OVER 2000 KM AT 20 GBIT/S AND 1000 KM AT 40 GBIT/S USING ERBIUM-DOPED FIBER AMPLIFIERS Peer-reviewed

    M NAKAZAWA, K SUZUKI, E YAMADA, H KUBOTA, Y KIMURA

    ELECTRONICS LETTERS　29　(16)　1474-1476　1993/08

    DOI： 10.1049/el:19930985 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  768. FEMTOSECOND ERBIUM-DOPED FIBER LASERS AND A SOLITON COMPRESSION TECHNIQUE Peer-reviewed

    E YOSHIDA, Y KIMURA, M NAKAZAWA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS　32　(8)　3461-3466　1993/08

    ISSN： 0021-4922

  769. CONTINUUM SUPPRESSED, UNIFORMLY REPETITIVE 136 FS PULSE GENERATION FROM AN ERBIUM-DOPED FIBER LASER WITH NONLINEAR POLARIZATION ROTATION Peer-reviewed

    M NAKAZAWA, E YOSHIDA, T SUGAWA, Y KIMURA

    ELECTRONICS LETTERS　29　(15)　1327-1329　1993/07

    DOI： 10.1049/el:19930890 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  770. SOLITON TRANSMISSION CONTROL IN TIME AND FREQUENCY DOMAINS Peer-reviewed

    H KUBOTA, M NAKAZAWA

    IEEE JOURNAL OF QUANTUM ELECTRONICS　29　(7)　2189-2197　1993/07

    DOI： 10.1109/3.237493 　

    ISSN： 0018-9197

    eISSN： 1558-1713

  771. Straight-line soliton data transmissions at 20 Gbit/s-2000 km and 40 Gbit/s-1000 km using erbium-doped fiber amplifiers Peer-reviewed

    M. Nakazawa, K. Suzuki, E. Yamada, H. Kubota, Y. Kimura

    Optical Amplifiers and Their Applications, OA&A'93　PD2　1993/07

  772. 20-30 GHz pulse train generation from a MQW electro-absorption intensity modulator Peer-reviewed

    E. Yamada, K. Wakita, M. Nakazawa

    Optical Amplifiers and Their Applications, OA&A'93　MD7　1993/07

  773. Femtosecond soliton interaction with adiabatic soliton narrowing in a distributed erbium-doped fiber amplifier Peer-reviewed

    K. Kurokawa, H. Kubota, M. Nakazawa

    Optical Amplifiers and Their Applications, OA&A'93　TuB4　1993/07

  774. 30 GHZ PULSE-TRAIN GENERATION FROM A MULTIQUANTUM-WELL ELECTROABSORPTION INTENSITY MODULATOR Peer-reviewed

    E YAMADA, K WAKITA, M NAKAZAWA

    ELECTRONICS LETTERS　29　(10)　845-847　1993/05

    DOI： 10.1049/el:19930565 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  775. 1.6 PS PULSE GENERATION FROM A 1.3-MU-M PR3+-DOPED FLUORIDE FIBER LASER Peer-reviewed

    T SUGAWA, E YOSHIDA, Y MIYAJIMA, M NAKAZAWA

    ELECTRONICS LETTERS　29　(10)　902-903　1993/05

    DOI： 10.1049/el:19930602 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  776. EXPERIMENTAL DEMONSTRATION OF SOLITON DATA-TRANSMISSION OVER UNLIMITED DISTANCES WITH SOLITON CONTROL IN TIME AND FREQUENCY DOMAINS Peer-reviewed

    M NAKAZAWA, K SUZUKI, E YAMADA, H KUBOTA, Y KIMURA, M TAKAYA

    ELECTRONICS LETTERS　29　(9)　729-730　1993/04

    DOI： 10.1049/el:19930489 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  777. ULTRAHIGH SPEED OPTICAL SOLITON COMMUNICATION USING ERBIUM-DOPED FIBER AMPLIFIERS Peer-reviewed

    E YAMADA, K SUZUKI, H KUBOTA, M NAKAZAWA

    IEICE TRANSACTIONS ON COMMUNICATIONS　E76B　(4)　410-419　1993/04

    ISSN： 0916-8516

    eISSN： 1745-1345

  778. SELF-Q-SWITCHING AND MODE-LOCKING IN A 1.53-MU-M FIBER RING LASER WITH SATURABLE ABSORPTION IN ERBIUM-DOPED FIBER AT 4.2-K Peer-reviewed

    M NAKAZAWA, K SUZUKI, H KUBOTA, Y KIMURA

    OPTICS LETTERS　18　(8)　613-615　1993/04

    ISSN： 0146-9592

    eISSN： 1539-4794

  779. GAIN CHARACTERISTICS OF ERBIUM-DOPED FIBER AMPLIFIERS WITH HIGH ERBIUM CONCENTRATION Peer-reviewed

    Y KIMURA, M NAKAZAWA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS　32　(3A)　1120-1125　1993/03

    ISSN： 0021-4922

  780. Ultrahigh-speed optical soliton communication and new aspects of soliton transmission technology(招待講演) Invited Peer-reviewed

    M. Nakazawa

    Optical Fiber Communication, OFC'93　WC1　1993/02

  781. Long-distance dynamic soliton transmission technology

    Masataka Nakazawa, Eiichi Yamada, Hirokazu Kubota, Kazunori Suzuki

    NTT R and D　42　(5)　661-668　1993

    ISSN： 0915-2326

  782. GENERATION OF 98FS OPTICAL PULSES DIRECTLY FROM AN ERBIUM-DOPED FIBER RING LASER AT 1.57-MU-M Peer-reviewed

    M NAKAZAWA, E YOSHIDA, Y KIMURA

    ELECTRONICS LETTERS　29　(1)　63-65　1993/01

    DOI： 10.1049/el:19930042 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  783. Reduction of ASE noise from transmitted soliton signals with a nonlinear amplifying optical loop mirror Peer-reviewed

    NAKAZAWA Masataka

    IEICE of Japan　J76-C-I　81-88　1993

  784. Soliton transmission control in time and frequency domains Peer-reviewed

    NAKAZAWA Masataka

    IEICE of Japan　J76-C-I　147-157　1993

  785. PHYSICAL INTERPRETATION OF REDUCTION OF SOLITON INTERACTION FORCES BY BANDWIDTH LIMITED AMPLIFICATION - REPLY Peer-reviewed

    M NAKAZAWA, H KUBOTA

    ELECTRONICS LETTERS　29　(2)　226-227　1993/01

    ISSN： 0013-5194

    eISSN： 1350-911X

  786. 1.6 ps pulse generation from a 1.3µm Pr3+-doped fluoride fibre laser Peer-reviewed

    T. Sugawa, E. Yoshida, Y. Miyajima, M. Nakazawa

    Electronics Letters　29　(10)　902-903　1993

    DOI： 10.1049/el:19930602 　

    ISSN： 0013-5194

  787. OPTICAL SOLITON TRANSMISSION TECHNOLOGY Invited Peer-reviewed

    M NAKAZAWA

    LEOS '93 CONFERENCE PROCEEDINGS　388-389　1993

    ISSN： 1092-8081

  788. SIGNIFICANT MODIFICATION OF FEMTOSECOND SOLITON INTERACTION IN GAIN MEDIUM BY SMALL SUBPULSES Peer-reviewed

    K KUROKAWA, H KUBOTA, M NAKAZAWA

    ELECTRONICS LETTERS　28　(25)　2334-2336　1992/12

    ISSN： 0013-5194

    eISSN： 1350-911X

  789. SOLITON SELF-FREQUENCY SHIFT ACCELERATED BY FEMTOSECOND SOLITON INTERACTION Peer-reviewed

    K KUROKAWA, H KUBOTA, M NAKAZAWA

    ELECTRONICS LETTERS　28　(22)　2052-2054　1992/10

    DOI： 10.1049/el:19921315 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  790. ELECTRON-BEAM VAPOR-DEPOSITED ERBIUM-DOPED GLASS WAVE-GUIDE LASER AT 1.53-MU-M Peer-reviewed

    M NAKAZAWA, Y KIMURA

    ELECTRONICS LETTERS　28　(22)　2054-2056　1992/10

    DOI： 10.1049/el:19921316 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  791. FEMTOSECOND SOLITON TRANSMISSION CHARACTERISTICS IN AN ULTRALONG ERBIUM-DOPED FIBER AMPLIFIER WITH DIFFERENT PUMPING CONFIGURATIONS Peer-reviewed

    K KUROKAWA, M NAKAZAWA

    IEEE JOURNAL OF QUANTUM ELECTRONICS　28　(9)　1922-1929　1992/09

    DOI： 10.1109/3.144485 　

    ISSN： 0018-9197

    eISSN： 1558-1713

  792. GAIN CHARACTERISTICS OF ERBIUM-DOPED FIBER AMPLIFIERS WITH HIGH ERBIUM CONCENTRATION Peer-reviewed

    Y KIMURA, M NAKAZAWA

    ELECTRONICS LETTERS　28　(15)　1420-1422　1992/07

    DOI： 10.1049/el:19920903 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  793. 10 Gbit/s penalty-free soliton data transmission over 1200 km Peer-reviewed

    E. Yamada, K. Suzuki, M. Nakazawa

    Opto Electronics Conference, OEC'92　16A4-4　1992/07

  794. Recent Progress on soliton transmission systems(招待講演) Invited Peer-reviewed

    M. Nakazawa

    Opto Electronics Conference, OEC'92　15A2-2　1992/07

  795. INFINITE-DISTANCE SOLITON TRANSMISSION WITH SOLITON CONTROLS IN TIME AND FREQUENCY DOMAINS Peer-reviewed

    M NAKAZAWA, H KUBOTA, E YAMADA, K SUZUKI

    ELECTRONICS LETTERS　28　(12)　1099-1100　1992/06

    DOI： 10.1049/el:19920694 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  796. PHYSICAL INTERPRETATION OF REDUCTION OF SOLITON INTERACTION FORCES BY BANDWIDTH LIMITED AMPLIFICATION Peer-reviewed

    M NAKAZAWA, H KUBOTA

    ELECTRONICS LETTERS　28　(10)　958-960　1992/05

    DOI： 10.1049/el:19920608 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  797. 20 GBIT/S, 1020KM PENALTY-FREE SOLITON DATA-TRANSMISSION USING ERBIUM-DOPED FIBER AMPLIFIERS Peer-reviewed

    M NAKAZAWA, K SUZUKI, E YAMADA

    ELECTRONICS LETTERS　28　(11)　1046-1047　1992/05

    DOI： 10.1049/el:19920663 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  798. 20 GBIT/S, 1020KM PENALTY-FREE SOLITON DATA-TRANSMISSION USING ERBIUM-DOPED FIBER AMPLIFIERS Peer-reviewed

    M NAKAZAWA, K SUZUKI, E YAMADA

    ELECTRONICS LETTERS　28　(11)　1046-1047　1992/05

    ISSN： 0013-5194

    eISSN： 1350-911X

  799. Ultralong distance soliton transmission(招待講演) Invited Peer-reviewed

    M. Nakazawa

    Conference on Lasers and Electro Optics, CLEO'92　CWI1　1992/05

  800. 10 GBIT/S, 1200 KM ERROR-FREE SOLITON DATA-TRANSMISSION USING ERBIUM-DOPED FIBER AMPLIFIERS Peer-reviewed

    M NAKAZAWA, K SUZUKI, E YAMADA, H KUBOTA, Y KIMURA

    ELECTRONICS LETTERS　28　(9)　817-818　1992/04

    DOI： 10.1049/el:19920517 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  801. Erbium-doped fibre amplifiers in femtosecond pulse generation and long-distance soliton communication(招待講演) Invited Peer-reviewed

    M. Nakazawa

    Mini-Symposium on Fibre Amplifiers for Communications, The Rank Prize Funds　1992/04

  802. COHERENT PI-PULSE PROPAGATION WITH PULSE BREAKUP IN AN ERBIUM-DOPED FIBER WAVE-GUIDE AMPLIFIER Peer-reviewed

    M NAKAZAWA, K SUZUKI, Y KIMURA, H KUBOTA

    PHYSICAL REVIEW A　45　(5)　R2682-R2685　1992/03

    DOI： 10.1103/PhysRevA.45.R2682 　

    ISSN： 2469-9926

    eISSN： 2469-9934

  803. LASER DIODE-PUMPED FEMTOSECOND ERBIUM-DOPED FIBER LASER WITH A SUB-RING CAVITY FOR REPETITION RATE CONTROL Peer-reviewed

    E YOSHIDA, Y KIMURA, M NAKAZAWA

    APPLIED PHYSICS LETTERS　60　(8)　932-934　1992/02

    DOI： 10.1063/1.106465 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  804. 10 Gbit/s-1200 km single-pass soliton data transmission using erbium-doped fiber amplifiers Peer-reviewed

    M. Nakazawa, K. Suzuki, E. Yamada, H. Kubota, Y. Kimura

    Optical Fiber Communication, OFC'92　PD11　1992/02

  805. Soliton transmission control in the time domain Peer-reviewed

    H. Kubota, M. Nakazawa

    Optical Fiber Communication, OFC'92　WC2　1992/02

  806. Recent progress on optical soliton communication and future prospects(招待講演) Invited Peer-reviewed

    M. Nakazawa

    Optical Fiber Communication, OFC'92　WC1　1992/02

  807. SELF-INDUCED-TRANSPARENCY SOLITONS IN AN ERBIUM-DOPED FIBER WAVE-GUIDE Peer-reviewed

    M NAKAZAWA, Y KIMURA, K KUROKAWA, K SUZUKI

    PHYSICAL REVIEW A　45　(1)　R23-R26　1992/01

    DOI： 10.1103/PhysRevA.45.R23 　

    ISSN： 1050-2947

    eISSN： 1094-1622

  808. PARTIAL SOLITON COMMUNICATION-SYSTEM Peer-reviewed

    H KUBOTA, M NAKAZAWA

    OPTICS COMMUNICATIONS　87　(1-2)　15-18　1992/01

    DOI： 10.1016/0030-4018(92)90033-N 　

    ISSN： 0030-4018

    eISSN： 1873-0310

  809. Self induced transparency soliton and coherent π pulse propagation in erbium-doped fibers and amplifiers Peer-reviewed

    NAKAZAWA Masataka

    Review of Laser Eng.　20　638-652　1992

  810. Soliton communication using erbium-doped fiber amplifiers Peer-reviewed

    NAKAZAWA Masataka

    Review of Laser Eng.　20　662-672　1992

  811. Femtosecond erbium fiber laser with a nonlinear amplifying loop mirror pumped by laser diodes and the repetition rate control of output pulses Peer-reviewed

    NAKAZAWA Masataka

    IECE of Japan　J75-C-I　613-621　1992

  812. A NEW TECHNIQUE FOR OPTICAL SOLITON COMMUNICATION Peer-reviewed

    H KUBOTA, E YAMADA, M NAKAZAWA

    NTT REVIEW　3　(6)　64-67　1991/11

    ISSN： 0915-2334

  813. COEXISTENCE OF A SELF-INDUCED-TRANSPARENCY SOLITON AND A NONLINEAR SCHRODINGER SOLITON IN AN ERBIUM-DOPED FIBER Peer-reviewed

    M NAKAZAWA, F YAMADA, H KUBOTA

    PHYSICAL REVIEW A　44　(9)　5973-5987　1991/11

    DOI： 10.1103/PhysRevA.44.5973 　

    ISSN： 2469-9926

    eISSN： 2469-9934

  814. Self-induced transparency soliton propagation in an erbium-doped optical fiber waveguide Peer-reviewed

    M. Nakazawa, Y. Kimura, K. Suzuki, K. Kurokawa, H. Kubota

    Optical Society of America Annual Meeting, Postdeadline paper　PD11　1991/11

    DOI： 10.1103/PhysRevA.45.R23 　

  815. Erbium-doped fiber amplifiers for ultrashort pulse generation and optical soliton communication(招待講演) Invited Peer-reviewed

    M. Nakazawa

    Optical Society of America Annual Meeting, Invited paper　MT3　1991/11

  816. LOW THRESHOLD, 290-FS ERBIUM-DOPED FIBER LASER WITH A NONLINEAR AMPLIFYING LOOP MIRROR PUMPED BY INGAASP LASER-DIODES Peer-reviewed

    M NAKAZAWA, E YOSHIDA, Y KIMURA

    APPLIED PHYSICS LETTERS　59　(17)　2073-2075　1991/10

    DOI： 10.1063/1.106134 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  817. FEMTOSECOND OPTICAL SOLITON TRANSMISSION OVER LONG DISTANCES USING ADIABATIC TRAPPING AND SOLITON STANDARDIZATION Peer-reviewed

    M NAKAZAWA, H KUBOTA, K KUROKAWA, E YAMADA

    JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS　8　(9)　1811-1817　1991/09

    DOI： 10.1364/JOSAB.8.001811 　

    ISSN： 0740-3224

    eISSN： 1520-8540

  818. FEMTOSECOND SOLITON TRANSMISSION IN 18-KM ERBIUM-DOPED FIBER AMPLIFIER WITH DIFFERENT PUMPING CONFIGURATIONS Peer-reviewed

    K KUROKAWA, M NAKAZAWA

    ELECTRONICS LETTERS　27　(19)　1765-1766　1991/09

    DOI： 10.1049/el:19911098 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  819. HIGH-GAIN CHARACTERISTICS OF AN ERBIUM-DOPED FIBER AMPLIFIER PUMPED IN THE 800-NM BAND Peer-reviewed

    Y KIMURA, E YOSHIDA, M NAKAZAWA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS　30　(9A)　1995-2001　1991/09

    ISSN： 0021-4922

  820. Repetition rate control of an LD-pumped femtosecond erbium-doped fiber laser using a sub ring cavity Peer-reviewed

    M. Nakazawa, E. Yamada, Y. Kimura

    Nonlinear Guided-Wave Phenomena, PDP-9　PDP-9　1991/09

  821. OBSERVATION OF NONLINEAR-INTERACTIONS IN 20 GBIT/S SOLITON TRANSMISSION OVER 500 KM USING ERBIUM-DOPED FIBER AMPLIFIERS Peer-reviewed

    M NAKAZAWA, K SUZUKI, E YAMADA, H KUBOTA

    ELECTRONICS LETTERS　27　(18)　1662-1663　1991/08

    DOI： 10.1049/el:19911038 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  822. 10 GBIT/S SOLITON DATA-TRANSMISSION OVER ONE MILLION KILOMETERS Peer-reviewed

    M NAKAZAWA, E YAMADA, H KUBOTA, K SUZUKI

    ELECTRONICS LETTERS　27　(14)　1270-1272　1991/07

    DOI： 10.1049/el:19910796 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  823. 10 GBIT/S SINGLE-PASS SOLITON TRANSMISSION OVER 1000 KM Peer-reviewed

    E YAMADA, K SUZUKI, M NAKAZAWA

    ELECTRONICS LETTERS　27　(14)　1289-1291　1991/07

    DOI： 10.1049/el:19910807 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  824. FEMTOSECOND SOLITON TRANSMISSION IN 18KM-LONG DISPERSION-SHIFTED, DISTRIBUTED ERBIUM-DOPED FIBER AMPLIFIER Peer-reviewed

    M NAKAZAWA, K KUROKAWA

    ELECTRONICS LETTERS　27　(15)　1369-1371　1991/07

    DOI： 10.1049/el:19910861 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  825. Gain characteristics of Lanthanum co-doped erbium fiber amplifier Peer-reviewed

    Y. Kimura, M. Nakazawa

    Optical Amplifiers and Their Applications, OA&A'91　WD5　1991/07

  826. RECENT PROGRESS ON OPTICAL SOLITON COMMUNICATION Peer-reviewed

    H KUBOTA, M NAKAZAWA

    IEICE TRANSACTIONS ON COMMUNICATIONS ELECTRONICS INFORMATION AND SYSTEMS　74　(6)　1373-1378　1991/06

    ISSN： 0917-1673

  827. WAVELENGTH-DEPENDENT AMPLIFICATION CHARACTERISTICS OF FEMTOSECOND ERBIUM-DOPED OPTICAL FIBER AMPLIFIERS Peer-reviewed

    K KUROKAWA, M NAKAZAWA

    APPLIED PHYSICS LETTERS　58　(25)　2871-2873　1991/06

    DOI： 10.1063/1.104758 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  828. LANTHANUM CODOPED ERBIUM FIBER AMPLIFIER Peer-reviewed

    M NAKAZAWA, Y KIMURA

    ELECTRONICS LETTERS　27　(12)　1065-1067　1991/06

    DOI： 10.1049/el:19910661 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  829. COEXISTENCE OF SELF-INDUCED TRANSPARENCY SOLITON AND NONLINEAR SCHRODINGER SOLITON Peer-reviewed

    M NAKAZAWA, E YAMADA, H KUBOTA

    PHYSICAL REVIEW LETTERS　66　(20)　2625-2628　1991/05

    DOI： 10.1103/PhysRevLett.66.2625 　

    ISSN： 0031-9007

    eISSN： 1079-7114

  830. Femtosecond optical pulse transmission over long distances using adiabatic soliton trapping and soliton standardization Peer-reviewed

    H. Kubota, M. Nakazawa, K. Kurokawa

    Optical Fiber Communication, OFC'91　TuK1　1991/02

  831. Dynamic soliton communication(招待講演) Invited Peer-reviewed

    M. Nakazawa

    Optical Fiber Communication, OFC'91　TuL1　1991/02

  832. NOISE-FIGURE CHARACTERISTICS OF ER3+-DOPED FIBER AMPLIFIER PUMPED IN 0.8 MU-M BAND Peer-reviewed

    Y KIMURA, K SUZUKI, M NAKAZAWA

    ELECTRONICS LETTERS　27　(2)　146-148　1991/01

    DOI： 10.1049/el:19910095 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  833. AUTOMATIC INTENSITY CONTROL OF AN OPTICAL-TRANSMISSION LINE USING ENHANCED GAIN SATURATION IN CASCADED OPTICAL AMPLIFIERS Peer-reviewed

    E YAMADA, M NAKAZAWA

    IEEE JOURNAL OF QUANTUM ELECTRONICS　27　(1)　146-151　1991/01

    DOI： 10.1109/3.73553 　

    ISSN： 0018-9197

    eISSN： 1558-1713

  834. Stabilization of optical output power using gain saturation of EDFA and its application to soliton communication Peer-reviewed

    NAKAZAWA Masataka

    IECE of Japan(in Japanese)　J74-C-I　167-175　1991

  835. Optical soliton transmission(招待論文) Peer-reviewed

    NAKAZAWA Masataka

    IECE of Japan　J74-C-I　429-439　1991

  836. NOISE-FIGURE CHARACTERISTICS OF ER3+-DOPED FIBER AMPLIFIER PUMPED IN 0.8 MU-M BAND Peer-reviewed

    Y KIMURA, K SUZUKI, M NAKAZAWA

    ELECTRONICS LETTERS　27　(2)　146-148　1991/01

    DOI： 10.1049/el:19910095 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  837. OPTICAL SOLITON COMMUNICATION USING ERBIUM-DOPED FIBER AMPLIFIERS Invited Peer-reviewed

    M NAKAZAWA

    IOOC-ECOC 91, PTS 1-4　A150-A164　1991

  838. ULTRA-EFFICIENT ERBIUM-DOPED FIBER AMPLIFIER Peer-reviewed

    Y KIMURA, M NAKAZAWA, K SUZUKI

    APPLIED PHYSICS LETTERS　57　(25)　2635-2637　1990/12

    DOI： 10.1063/1.103831 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  839. DYNAMIC OPTICAL SOLITON COMMUNICATION Peer-reviewed

    M NAKAZAWA, K SUZUKI, H KUBOTA, E YAMADA, Y KIMURA

    IEEE JOURNAL OF QUANTUM ELECTRONICS　26　(12)　2095-2102　1990/12

    DOI： 10.1109/3.64344 　

    ISSN： 0018-9197

    eISSN： 1558-1713

  840. ULTRALONG DISPERSION-SHIFTED ERBIUM-DOPED FIBER AMPLIFIER AND ITS APPLICATION TO SOLITON TRANSMISSION Peer-reviewed

    M NAKAZAWA, Y KIMURA, K SUZUKI

    IEEE JOURNAL OF QUANTUM ELECTRONICS　26　(12)　2103-2108　1990/12

    DOI： 10.1109/3.64345 　

    ISSN： 0018-9197

    eISSN： 1558-1713

  841. GAIN-DISTRIBUTION MEASUREMENTS ALONG AN ULTRALONG ERBIUM-DOPED FIBER AMPLIFIER USING OPTICAL-TIME-DOMAIN REFLECTOMETRY Peer-reviewed

    M NAKAZAWA, Y KIMURA, K SUZUKI

    OPTICS LETTERS　15　(21)　1200-1202　1990/11

    DOI： 10.1364/OL.15.001200 　

    ISSN： 0146-9592

    eISSN： 1539-4794

  842. HIGH-POWER ER-3+-DOPED FIBER AMPLIFIER PUMPED BY 1.48-MU-M LASER-DIODES Peer-reviewed

    K SUZUKI, Y KIMURA, M NAKAZAWA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS　29　(11)　L2067-L2069　1990/11

    ISSN： 0021-4922

  843. EFFICIENT ERBIUM-DOPED FIBER AMPLIFIER PUMPED AT 820 NM Peer-reviewed

    M NAKAZAWA, Y KIMURA, E YOSHIDA, K SUZUKI

    ELECTRONICS LETTERS　26　(23)　1936-1938　1990/11

    DOI： 10.1049/el:19901253 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  844. FEMTOSECOND OPTICAL PULSE GENERATION USING A DISTRIBUTED-FEEDBACK LASER DIODE Peer-reviewed

    M NAKAZAWA, K SUZUKI, E YAMADA

    ELECTRONICS LETTERS　26　(24)　2038-2040　1990/11

    DOI： 10.1049/el:19901315 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  845. Optical soliton transmission and femtosecond pulse technology Peer-reviewed

    M. Nakazawa

    NTT International Symposium'90　119-133　1990/11

  846. OBSERVATION OF THE TRAPPING OF AN OPTICAL SOLITON BY ADIABATIC GAIN NARROWING AND ITS ESCAPE Peer-reviewed

    M NAKAZAWA, K KUROKAWA, H KUBOTA, E YAMADA

    PHYSICAL REVIEW LETTERS　65　(15)　1881-1884　1990/10

    DOI： 10.1103/PhysRevLett.65.1881 　

    ISSN： 0031-9007

    eISSN： 1079-7114

  847. Optical soliton communication Peer-reviewed

    M. Nakazawa

    The Second International Forum on the Frontier of Telecommunications Technology　1-7　1990/10

  848. 20 GBIT/S SOLITON TRANSMISSION OVER 200 KM USING ERBIUM-DOPED FIBER REPEATERS Peer-reviewed

    M NAKAZAWA, K SUZUKI, E YAMADA, Y KIMURA

    ELECTRONICS LETTERS　26　(19)　1592-1593　1990/09

    DOI： 10.1049/el:19901020 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  849. The dawn of optical soliton communication(招待講演) Invited Peer-reviewed

    M. Nakazawa

    Mini-Symposium on Nonlinear optical Fibre Pulse Processing, The Rank Prize Funds　WE-14　1990/09

  850. FEMTOSECOND ERBIUM-DOPED OPTICAL FIBER AMPLIFIER Peer-reviewed

    M NAKAZAWA, K KUROKAWA, H KUBOTA, K SUZUKI, Y KIMURA

    APPLIED PHYSICS LETTERS　57　(7)　653-655　1990/08

    DOI： 10.1063/1.104102 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  851. MAXIMUM TRANSMISSION CAPACITY OF A SOLITON COMMUNICATION-SYSTEM WITH LUMPED AMPLIFIERS Peer-reviewed

    H KUBOTA, M NAKAZAWA

    ELECTRONICS LETTERS　26　(18)　1454-1456　1990/08

    DOI： 10.1049/el:19900933 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  852. An ultra-efficient erbium-doped fiber amplifier of 10.2 dB/mW at 0.98 μm pumping and 5.1 dB/mW at 1.48 μm pumping Peer-reviewed

    M. Nakazawa, Y. Kimura, K. Suzuki

    Optical Amplifiers and Their Applications, OA&A'90　PDP1　1990/08

  853. High gain erbium-doped fiber amplifier pumped by 820 nm GaAlAs laser diode Peer-reviewed

    K. Suzuki, Y. Kimura, M. Nakazawa

    Optical Amplifiers and Their Applications, OA&A'90　MB4　1990/08

  854. Soliton transmission in a distributed, dispersion-shifted erbium-doped fiber amplifier Peer-reviewed

    M. Nakazawa, Y. Kimura, K. Suzuki

    Optical Amplifiers and Their Applications, OA&A'90　TuA7　1990/08

  855. AUTOMATIC OPTICAL SOLITON CONTROL USING CASCADED ER-3+-DOPED FIBER AMPLIFIERS Peer-reviewed

    K SUZUKI, M NAKAZAWA

    ELECTRONICS LETTERS　26　(14)　1032-1034　1990/07

    DOI： 10.1049/el:19900669 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  856. TRANSFORM-LIMITED PULSE GENERATION IN THE GIGAHERTZ REGION FROM A GAIN-SWITCHED DISTRIBUTED-FEEDBACK LASER DIODE USING SPECTRAL WINDOWING Peer-reviewed

    M NAKAZAWA, K SUZUKI, Y KIMURA

    OPTICS LETTERS　15　(12)　715-717　1990/06

    DOI： 10.1364/OL.15.000715 　

    ISSN： 0146-9592

    eISSN： 1539-4794

  857. HIGH-GAIN ER-3+-DOPED FIBER AMPLIFIER PUMPED BY 820 NM GAALAS LASER-DIODES Peer-reviewed

    K SUZUKI, Y KIMURA, M NAKAZAWA

    ELECTRONICS LETTERS　26　(13)　948-949　1990/06

    DOI： 10.1049/el:19900618 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  858. GENERATION AND TRANSMISSION OF OPTICAL SOLITONS IN THE GIGAHERTZ REGION USING A DIRECTLY MODULATED DISTRIBUTED-FEEDBACK LASER DIODE Peer-reviewed

    M NAKAZAWA, K SUZUKI, Y KIMURA

    OPTICS LETTERS　15　(10)　588-590　1990/05

    DOI： 10.1364/OL.15.000588 　

    ISSN： 0146-9592

    eISSN： 1539-4794

  859. Propagation and amplification of ultrashort optical soliton pulses in erbium-doped fibers for very high speed communication(招待講演) Invited Peer-reviewed

    M. Nakazawa

    Topical Meeting on Ultrafast Phenomena, ICUP'90　ThA2-1　1990/05

  860. LONG-DISTANCE OPTICAL SOLITON TRANSMISSION WITH LUMPED AMPLIFIERS Peer-reviewed

    H KUBOTA, M NAKAZAWA

    IEEE JOURNAL OF QUANTUM ELECTRONICS　26　(4)　692-700　1990/04

    DOI： 10.1109/3.53386 　

    ISSN： 0018-9197

    eISSN： 1558-1713

  861. PUMP WAVELENGTH DEPENDENCE OF THE GAIN FACTOR IN 1.48 MU-M PUMPED ER-3+-DOPED FIBER AMPLIFIERS Peer-reviewed

    Y KIMURA, K SUZUKI, M NAKAZAWA

    APPLIED PHYSICS LETTERS　56　(17)　1611-1613　1990/04

    DOI： 10.1063/1.103141 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  862. 5 GBIT/S, 250KM ERROR-FREE SOLITON TRANSMISSION WITH ER3+-DOPED FIBER AMPLIFIERS AND REPEATERS Peer-reviewed

    K SUZUKI, M NAKAZAWA, E YAMADA, Y KIMURA

    ELECTRONICS LETTERS　26　(8)　551-553　1990/04

    DOI： 10.1049/el:19900359 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  863. HIGH-GAIN ERBIUM FIBER AMPLIFIER PUMPED BY 800NM BAND Peer-reviewed

    M NAKAZAWA, Y KIMURA, K SUZUKI

    ELECTRONICS LETTERS　26　(8)　548-550　1990/04

    DOI： 10.1049/el:19900357 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  864. 3.2-5 GB/S, 100 KM ERROR-FREE SOLITON TRANSMISSIONS WITH ERBIUM AMPLIFIERS AND REPEATERS Peer-reviewed

    M NAKAZAWA, K SUZUKI, Y KIMURA

    IEEE PHOTONICS TECHNOLOGY LETTERS　2　(3)　216-219　1990/03

    DOI： 10.1109/68.50894 　

    ISSN： 1041-1135

  865. NEAR-INFRARED ULTRASHORT PULSE GENERATION WITH LINBO3 BY DIFFERENCE-FREQUENCY-GENERATION Peer-reviewed

    K KUROKAWA, M NAKAZAWA, TA CAUGHEY

    OPTICS COMMUNICATIONS　75　(5-6)　413-418　1990/03

    ISSN： 0030-4018

  866. Erbium-doped optical fiber amplifiers and thier applications Peer-reviewed

    NAKAZAWA Masataka

    Journal of Applied Physics　59　1175-1192　1990

    DOI： 10.11470/oubutsu1932.59.1175 　

  867. PROPAGATION AND AMPLIFICATION OF ULTRASHORT OPTICAL SOLITON PULSES IN ERBIUM-DOPED FIBERS FOR VERY HIGH-SPEED COMMUNICATION Peer-reviewed

    M NAKAZAWA

    ULTRAFAST PHENOMENA VII　53　(Ultrafast Phenomena VII)　179-183　1990

  868. Distortion-free single-pass soliton communication over 250 km using multiple Er3+-doped optical repeaters Peer-reviewed

    M. Nakazawa, K. Suzuki, E. Yamada, Y. Kimura

    OFC'90　PD5　1990/01

  869. Amplification and transmission at 1.53-1.55 μm with Er3+-doped fibers(招待講演) Invited Peer-reviewed

    M. Nakazawa, Y. Kimura

    Optical Fiber Communication, OFC'90　FA5　1990/01

  870. HIGH-GAIN ERBIUM-DOPED FIBER AMPLIFIER PUMPED IN THE 0.8 MU-M PUMP BAND Peer-reviewed

    Y KIMURA, K SUZUKI, M NAKAZAWA

    16TH EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION, VOLS 1-3　103-106　1990

  871. FEMTOSECOND PULSE GENERATION IN THE 1300 - 1600 NM REGION AND APPLICATION TO OPTICAL COMMUNICATION Peer-reviewed

    K KUROKAWA, M NAKAZAWA

    16TH EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION, VOLS 1-3　705-712　1990

  872. PUMPING WAVELENGTH DEPENDENCE ON GAIN FACTOR OF A 0.98-MU-M PUMPED ER-3+ FIBER AMPLIFIER Peer-reviewed

    K SUZUKI, Y KIMURA, M NAKAZAWA

    APPLIED PHYSICS LETTERS　55　(25)　2573-2575　1989/12

    DOI： 10.1063/1.101982 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  873. 46.5DB GAIN IN ER3+-DOPED FIBER AMPLIFIER PUMPED BY 1.48-MU-M GAINASP LASER-DIODES Peer-reviewed

    Y KIMURA, K SUZUKI, M NAKAZAWA

    ELECTRONICS LETTERS　25　(24)　1656-1657　1989/11

    DOI： 10.1049/el:19891110 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  874. WAVELENGTH MULTIPLE SOLITON AMPLIFICATION AND TRANSMISSION WITH AN ER-3+-DOPED OPTICAL FIBER Peer-reviewed

    M NAKAZAWA, Y KIMURA, K SUZUKI, H KUBOTA

    JOURNAL OF APPLIED PHYSICS　66　(7)　2803-2812　1989/10

    DOI： 10.1063/1.344208 　

    ISSN： 0021-8979

    eISSN： 1089-7550

  875. 20-GHZ SOLITON AMPLIFICATION AND TRANSMISSION WITH AN ER3+-DOPED FIBER Peer-reviewed

    M NAKAZAWA, K SUZUKI, Y KIMURA

    OPTICS LETTERS　14　(19)　1065-1067　1989/10

    DOI： 10.1364/OL.14.001065 　

    ISSN： 0146-9592

    eISSN： 1539-4794

  876. GENERATION OF 72-FS PULSE FROM A CAVITY DUMPED, SYNCHRONOUSLY PUMPED DYE-LASER WITH A SINGLE JET Peer-reviewed

    K KUROKAWA, H KUBOTA, M NAKAZAWA

    OPTICS COMMUNICATIONS　73　(4)　319-321　1989/10

    DOI： 10.1016/0030-4018(89)90225-3 　

    ISSN： 0030-4018

    eISSN： 1873-0310

  877. THE MODULATIONAL INSTABILITY LASER .1. EXPERIMENT Peer-reviewed

    M NAKAZAWA, K SUZUKI, HA HAUS

    IEEE JOURNAL OF QUANTUM ELECTRONICS　25　(9)　2036-2044　1989/09

    DOI： 10.1109/3.35230 　

    ISSN： 0018-9197

    eISSN： 1558-1713

  878. THE MODULATIONAL INSTABILITY LASER .2. THEORY Peer-reviewed

    M NAKAZAWA, K SUZUKI, H KUBOTA, HA HAUS

    IEEE JOURNAL OF QUANTUM ELECTRONICS　25　(9)　2045-2052　1989/09

    DOI： 10.1109/3.35231 　

    ISSN： 0018-9197

    eISSN： 1558-1713

  879. LASER-DIODE-PUMPED MIRROR-FREE ER-3+-DOPED FIBER LASER Peer-reviewed

    Y KIMURA, K SUZUKI, M NAKAZAWA

    OPTICS LETTERS　14　(18)　999-1001　1989/09

    DOI： 10.1364/OL.14.000999 　

    ISSN： 0146-9592

    eISSN： 1539-4794

  880. Erbium-doped fiber amplifier and its application to nonlinear optics(招待講演) Invited Peer-reviewed

    M. Nakazawa

    SPIE　1171　1989/09

  881. SUBPICOSECOND SOLITON AMPLIFICATION AND TRANSMISSION USING ER-3+-DOPED FIBERS PUMPED BY INGAASP LASER-DIODES Peer-reviewed

    K SUZUKI, Y KIMURA, M NAKAZAWA

    OPTICS LETTERS　14　(16)　865-867　1989/08

    ISSN： 0146-9592

  882. FEMTOSECOND 1.4-1.6-MU-M INFRARED PULSE GENERATION AT A HIGH REPETITION RATE BY DIFFERENCE FREQUENCY GENERATION Peer-reviewed

    K KUROKAWA, M NAKAZAWA

    APPLIED PHYSICS LETTERS　55　(1)　7-9　1989/07

    DOI： 10.1063/1.101759 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  883. 20 Gb/s soliton amplification and transmission with an Er3+-doped fiber Peer-reviewed

    M. Nakazawa, K. Suzuki, Y. Kimura

    IOOC'89　20PDA-3　1989/07

  884. Erbium-doped optical fiber amplifier(招待講演) Invited Peer-reviewed

    M. Nakazawa

    Workshop on Optical Amplification for Communications, in conjunction with IOOC'89　1989/07

  885. Subpicosecond soliton amplification and transmission using Er3+-doped fiber pumped by InGaAsP laser diodes Peer-reviewed

    K. Suzuki, Y. Kimura, M. Nakazawa

    IOOC'89　20PDA-2　1989/07

  886. Optical soliton amplification and transmission by stimulated Raman scattering pumped by InGaAsP laser diode Peer-reviewed

    K. Suzuki, Y. Kimura, M. Nakazawa

    IOOC'89　21C4-4　1989/07

  887. Gain dynamics of an Er3+-doped fiber amplifier Peer-reviewed

    Y. Kimura, K. Suzuki, M. Nakazawa

    IOOC'89　20A4-6　1989/07

  888. Femtosecond fiber Raman soliton and related technique(招待講演) Invited Peer-reviewed

    M. Nakazawa

    International conference on Integrated Optics and Optical Fiber Communication, IOOC'89　18A2-1　1989/07

  889. HIGH-ORDER SOLITONS AND THE MODULATIONAL INSTABILITY Peer-reviewed

    M NAKAZAWA, K SUZUKI, H KUBOTA, HA HAUS

    PHYSICAL REVIEW A　39　(11)　5768-5776　1989/06

    DOI： 10.1103/PhysRevA.39.5768 　

    ISSN： 1050-2947

  890. AN 8-MW CW ER-3+-DOPED FIBER LASER PUMPED BY 1.46 MU-M INGAASP LASER-DIODES Peer-reviewed

    K SUZUKI, Y KIMURA, M NAKAZAWA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS　28　(6)　L1000-L1002　1989/06

    ISSN： 0021-4922

  891. 250-KM NONREPEATED TRANSMISSION EXPERIMENT AT 1.8GB/S USING LD PUMPED ER3+-DOPED FIBER AMPLIFIERS IN IM DIRECT DETECTION SYSTEM Peer-reviewed

    K HAGIMOTO, K IWATSUKI, A TAKADA, M NAKAZAWA, M SARUWATARI, K AIDA, K NAKAGAWA

    ELECTRONICS LETTERS　25　(10)　662-664　1989/05

    DOI： 10.1049/el:19890448 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  892. STUDY OF OPTICAL PULSE-COMPRESSION WITH HIGHER-ORDER NONLINEARITY AND DISPERSION Peer-reviewed

    H KUBOTA, M NAKAZAWA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS　28　(4)　609-614　1989/04

    ISSN： 0021-4922

  893. Parametric soliton laser Peer-reviewed

    K. Suzuki, M. Nakazawa, H. A. Haus

    Conference on Lasers and Electro Optics, CLEO'89　FA4　1989/04

  894. PARAMETRIC SOLITON LASER Peer-reviewed

    K SUZUKI, M NAKAZAWA, HA HAUS

    OPTICS LETTERS　14　(6)　320-332　1989/03

    ISSN： 0146-9592

    eISSN： 1539-4794

  895. THE PARAMETRIC SOLITON LASER WITH LOW PEDESTAL Peer-reviewed

    K SUZUKI, M NAKAZAWA, HA HAUS

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS　28　(2)　L256-L258　1989/02

    DOI： 10.1143/JJAP.28.L256 　

    ISSN： 0021-4922

  896. The modulational instability laser(招待講演) Invited Peer-reviewed

    M. Nakazawa

    Nonlinear Guided-Wave Phenomenon : Physics and Applications　FA1-1　1989/02

  897. A 212-km non-repeated transmission experiment at 1.8 Gb/s using LD pumped Er3+-doped fiber amplifiers in an IM/DD repeater systems Peer-reviewed

    K. Hagimoto, M. Nakazawa

    Optical Fiber Communication, OFC'89　PD15　1989/02

  898. SOLITON AMPLIFICATION AND TRANSMISSION WITH ER-3+-DOPED FIBER REPEATER PUMPED BY GAINASP LASER DIODE Peer-reviewed

    M NAKAZAWA, Y KIMURA, K SUZUKI

    ELECTRONICS LETTERS　25　(3)　199-200　1989/02

    ISSN： 0013-5194

    eISSN： 1350-911X

  899. Mode competition between 0.9-and 1.08 μm laser transition in a Nd3+-doped fiber laser Peer-reviewed

    Y. Kimura, M. Nakazawa

    Optical Fiber Communication, OFC'89　TUG8　1989/02

  900. SOLITON AMPLIFICATION AND TRANSMISSION WITH ER-3+-DOPED FIBER REPEATER PUMPED BY GAINASP LASER DIODE Peer-reviewed

    M NAKAZAWA, Y KIMURA, K SUZUKI

    ELECTRONICS LETTERS　25　(3)　199-200　1989/02

    DOI： 10.1049/el:19890143 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  901. Erbium-doped fiber amplifier and its application to nonlinear optics Peer-reviewed

    NAKAZAWA Masataka

    Proceedings of SPIE-The International Society for Optical Engineering　1171　328-345　1989

  902. Efficient Er3+-doped optical fiber amplifier pumped by a 1.48 μm InGaAsP laser diode Peer-reviewed

    Masataka Nakazawa, Yasuo Kimura, Kazunori Suzuki

    Applied Physics Letters　54　(4)　295-297　1989

    DOI： 10.1063/1.101448 　

    ISSN： 0003-6951

  903. Wavelength multiple soliton amplification and transmission with an Er 3+-doped optical fiber Peer-reviewed

    Masataka Nakazawa, Yasuo Kimura, Kazunori Suzuki, Hirokazu Kubota

    Journal of Applied Physics　66　(7)　2803-2812　1989

    DOI： 10.1063/1.344208 　

    ISSN： 0021-8979

  904. EFFICIENT ER-3+-DOPED OPTICAL FIBER AMPLIFIER PUMPED BY A 1.48-MU-M INGAASP LASER DIODE Peer-reviewed

    M NAKAZAWA, Y KIMURA, K SUZUKI

    APPLIED PHYSICS LETTERS　54　(4)　295-297　1989/01

    DOI： 10.1063/1.101448 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  905. MODULATIONAL INSTABILITY OSCILLATION IN NONLINEAR DISPERSIVE RING CAVITY Peer-reviewed

    M NAKAZAWA, K SUZUKI, HA HAUS

    PHYSICAL REVIEW A　38　(10)　5193-5196　1988/11

    DOI： 10.1103/PhysRevA.38.5193 　

    ISSN： 1050-2947

  906. 48 FS, 190 KW PULSE GENERATION FROM A CAVITY DUMPED, SYNCHRONOUSLY PUMPED DYE-LASER Peer-reviewed

    K KUROKAWA, H KUBOTA, M NAKAZAWA

    OPTICS COMMUNICATIONS　68　(4)　287-290　1988/10

    DOI： 10.1016/0030-4018(88)90401-4 　

    ISSN： 0030-4018

  907. MULTIWAVELENGTH CW LASER OSCILLATION IN A ND-3+ AND ER-3+ DOUBLY DOPED FIBER LASER Peer-reviewed

    Y KIMURA, M NAKAZAWA

    APPLIED PHYSICS LETTERS　53　(14)　1251-1253　1988/10

    DOI： 10.1063/1.100444 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  908. 29-FSEC PULSE GENERATION FROM A LINEAR-CAVITY SYNCHRONOUSLY PUMPED DYE-LASER Peer-reviewed

    H KUBOTA, K KUROKAWA, M NAKAZAWA

    OPTICS LETTERS　13　(9)　749-751　1988/09

    ISSN： 0146-9592

    eISSN： 1539-4794

  909. RAMAN AMPLIFICATION IN A P2O5-DOPED OPTICAL FIBER Peer-reviewed

    K SUZUKI, M NAKAZAWA

    OPTICS LETTERS　13　(8)　666-668　1988/08

    ISSN： 0146-9592

    eISSN： 1539-4794

  910. LASING CHARACTERISTICS OF ER-3+-DOPED SILICA FIBERS FROM 1553 UP TO 1603 NM Peer-reviewed

    Y KIMURA, M NAKAZAWA

    JOURNAL OF APPLIED PHYSICS　64　(2)　516-520　1988/07

    DOI： 10.1063/1.341990 　

    ISSN： 0021-8979

    eISSN： 1089-7550

  911. Generation of 29-femtosecond pulses from a synchronously pumped dye laser and its cavity damping technique Peer-reviewed

    M. Nakazawa, H. Kubota, K. Kurokawa

    Sixth International Conference on Ultrafast Phenomena, ICUP'88　TUC3-1　1988/07

  912. Multi-wavelength laser oscillations in a Nd3+ and Er3t doubly doped fiber laser Peer-reviewed

    Y. Kimura, M. Nakazawa

    IQEC'88　WK-7　1988/07

  913. Raman amplification in P2O5 doped silica fibers Peer-reviewed

    K. Suzuki, M. Nakazawa

    IQEC'88　MP-43　1988/07

  914. COMPENSATION OF NONLINEAR CHIRP GENERATED BY SELF-STEEPENING USING 3RD-ORDER DISPERSION OF A GRATING PAIR Peer-reviewed

    H KUBOTA, M NAKAZAWA

    OPTICS COMMUNICATIONS　66　(2-3)　79-82　1988/04

    DOI： 10.1016/0030-4018(88)90037-5 　

    ISSN： 0030-4018

    eISSN： 1873-0310

  915. EFFICIENT OPTICAL PULSE-COMPRESSION USING A PAIR OF BREWSTER-ANGLED TEO2 CRYSTAL PRISMS Peer-reviewed

    M NAKAZAWA, T NAKASHIMA, H KUBOTA, S SEIKAI

    JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS　5　(2)　215-221　1988/02

    ISSN： 0740-3224

    eISSN： 1520-8540

  916. OPTICAL PULSE-COMPRESSION USING A TEO2 ACOUSTOOPTICAL LIGHT DEFLECTOR Peer-reviewed

    M NAKAZAWA, T NAKASHIMA, H KUBOTA

    OPTICS LETTERS　13　(2)　120-122　1988/02

    ISSN： 0146-9592

    eISSN： 1539-4794

  917. Multimode-fiber-type optical directional coupler for OTDR by using acoustooptical deflector Peer-reviewed

    NAKAZAWA Masataka

    IECE of Japan　J71-B　547-554　1988

  918. Frequency tuning characteristics of fiber Raman soliton laser Peer-reviewed

    M. Nakazawa, K. Suzuki, H. Nakano, H. A. Haus

    International Quantum Electronics Conference, IQEC'88　ThE-5　1988/01

  919. The soliton laser(招待講演) Invited Peer-reviewed

    M. Nakazawa

    13th European workshop on Optical Waveguide Theory　1988/01

  920. SIMULTANEOUS OSCILLATION AT 0.91-MU-M, 1.08-MU-M, AND 1.53-MU-M IN A FUSION-SPLICED FIBER LASER Peer-reviewed

    M NAKAZAWA, Y KIMURA

    APPLIED PHYSICS LETTERS　51　(22)　1768-1770　1987/11

    DOI： 10.1063/1.98516 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  921. 65-FEMTOSECOND PULSE GENERATION FROM A SYNCHRONOUSLY PUMPED DYE-LASER WITHOUT A COLLIDING-PULSE MODE-LOCKING TECHNIQUE Peer-reviewed

    M NAKAZAWA, T NAKASHIMA, H KUBOTA, S SEIKAI

    OPTICS LETTERS　12　(9)　681-683　1987/09

    DOI： 10.1364/OL.12.000681 　

    ISSN： 0146-9592

    eISSN： 1539-4794

  922. THEORY OF THE SYNCHRONOUSLY PUMPED FIBER RAMAN LASER WITH SELF-PHASE MODULATION Peer-reviewed

    M NAKAZAWA, MS STIX, EP IPPEN, HA HAUS

    JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS　4　(9)　1412-1421　1987/09

    ISSN： 0740-3224

    eISSN： 1520-8540

  923. 55-KW, 240-FS PULSE GENERATION FROM A CAVITY DUMPED, SYNCHRONOUSLY PUMPED DYE-LASER AND ITS APPLICATION TO PULSE-COMPRESSION Peer-reviewed

    M NAKAZAWA, T NAKASHIMA, H KUBOTA, S SEIKAI

    APPLIED PHYSICS LETTERS　51　(10)　728-730　1987/09

    DOI： 10.1063/1.99006 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  924. NONLINEAR POLARIZATION CHANGES IN A BIREFRINGENT FIBER Peer-reviewed

    Y KIMURA, M NAKAZAWA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS　26　(9)　1503-1508　1987/09

    ISSN： 0021-4922

  925. LASING SPECTRUM OF P CO-DOPED ND-3+ SILICA FIBERS Peer-reviewed

    Y KIMURA, M NAKAZAWA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS　26　(8)　L1253-L1254　1987/08

    ISSN： 0021-4922

  926. FIBEROPTIC NONLINEAR COHERENT COUPLER Peer-reviewed

    Y KIMURA, M NAKAZAWA, S SEIKAI

    IEEE JOURNAL OF QUANTUM ELECTRONICS　23　(8)　1261-1267　1987/08

    DOI： 10.1109/JQE.1987.1073511 　

    ISSN： 0018-9197

    eISSN： 1558-1713

  927. Optical time domain reflectometors in single-mode optical fibers(招待講演) Invited Peer-reviewed

    M. Nakazawa

    XXIInd General Assembly of the International Union of Radio-Science, URSI　1987/08

  928. EFFECT OF STIMULATED RAMAN-SCATTERING ON PULSE-COMPRESSION CHARACTERISTICS Peer-reviewed

    T NAKASHIMA, M NAKAZAWA, K NISHI, H KUBOTA

    OPTICS LETTERS　12　(6)　404-406　1987/06

    ISSN： 0146-9592

    eISSN： 1539-4794

  929. THEORY OF THE FIBER RAMAN SOLITON LASER Peer-reviewed

    HA HAUS, M NAKAZAWA

    JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS　4　(5)　652-660　1987/05

    ISSN： 0740-3224

  930. Optical pulse compression and soliton lasers.

    NAKAZAWA Masataka

    rle　15　(11)　869-886　1987

    Publisher: The Laser Society of Japan

    DOI： 10.2184/lsj.15.869 　

    ISSN： 0387-0200

    More details Close

    Recent progress on optical pulse compression techniques, optical solitons, and soliton lasers has been discussed. It is shown that nonlinear pulse propagation in single-mode fibers, which includes self-phase modulation and group velocity dispersion, plays an important role in making linearly chirped rectangular pulses, resuiting in efficient compression with a grating pair. The self steepening effect, a third-order dispersion, and the stimulated Raman scattering, which would deteriorate the compression characteristics, have been discussed in dctail. For a negative GVD region, an optical soliton described with a nonlinear schrodinger equation can be creiatcd by balancing SPM with GVD. A soliton laser by means of a color center Iaser and a fiber Raman soliton laser are discussed in terms of a perturbation theory.

  931. Nonlinear optics in optical fibers Peer-reviewed

    NAKAZAWA Masataka

    Journal of Applied Physics　56　(10)　1265-1288　1987

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/oubutsu1932.56.1265 　

    ISSN： 0369-8009

  932. THEORY OF THE SYNCHRONOUSLY PUMPED FIBER RAMAN LASER Peer-reviewed

    M NAKAZAWA, M KUZNETSOV, EP IPPEN

    IEEE JOURNAL OF QUANTUM ELECTRONICS　22　(10)　1953-1966　1986/10

    DOI： 10.1109/JQE.1986.1072892 　

    ISSN： 0018-9197

    eISSN： 1558-1713

  933. OPTICAL FIBER CABLE MEASUREMENTS IN THE FIELD Peer-reviewed

    N UESUGI, T HORIGUCHI, M NAKAZAWA, Y MURAKAMI

    IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS　4　(5)　732-736　1986/08

    DOI： 10.1109/JSAC.1986.1146373 　

    ISSN： 0733-8716

  934. THEORETICAL LIMIT OF REPEATER SPACING IN AN OPTICAL-TRANSMISSION LINE UTILIZING RAMAN AMPLIFICATION Peer-reviewed

    T NAKASHIMA, S SEIKAI, M NAKAZAWA, Y NEGISHI

    JOURNAL OF LIGHTWAVE TECHNOLOGY　4　(8)　1267-1272　1986/08

    ISSN： 0733-8724

  935. CONFIGURATION OF THE OPTICAL-TRANSMISSION LINE USING STIMULATED RAMAN-SCATTERING FOR SIGNAL LIGHT AMPLIFICATION Peer-reviewed

    T NAKASHIMA, S SEIKAI, M NAKAZAWA

    JOURNAL OF LIGHTWAVE TECHNOLOGY　4　(6)　569-573　1986/06

    ISSN： 0733-8724

    eISSN： 1558-2213

  936. PHASE-SENSITIVE DETECTION ON LORENTZIAN LINE-SHAPE AND ITS APPLICATION TO FREQUENCY STABILIZATION OF LASERS Peer-reviewed

    M NAKAZAWA

    JOURNAL OF APPLIED PHYSICS　59　(7)　2297-2305　1986/04

    DOI： 10.1063/1.336326 　

    ISSN： 0021-8979

  937. Theory of the Synchronously Pumped Fiber Raman Laser Peer-reviewed

    Masataka Nakazawa, Mark Kuznetsov, Erich P. Ippen

    IEEE Journal of Quantum Electronics　22　(10)　1953-1966　1986

    DOI： 10.1109/JQE.1986.1072892 　

    ISSN： 1558-1713 0018-9197

  938. SELF-DETECTING OPTICAL-TIME-DOMAIN REFLECTOMETER FOR SINGLE-MODE FIBERS Peer-reviewed

    M NAKAZAWA, T NAKASHIMA, S SEIKAI, M IKEDA

    OPTICS LETTERS　10　(3)　157-159　1985

    ISSN： 0146-9592

    eISSN： 1539-4794

  939. OPTICAL-TIME DOMAIN REFLECTOMETER WITH A LASER DIODE OPERATING AS LIGHT EMITTER PHOTODETECTOR Peer-reviewed

    T NAKASHIMA, M NAKAZAWA, S SEIKAI

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS　24　(2)　L135-L136　1985

    DOI： 10.1143/JJAP.24.L135 　

    ISSN： 0021-4922

  940. SYNCHRONOUSLY PUMPED FIBER RAMAN GYROSCOPE Peer-reviewed

    M NAKAZAWA

    OPTICS LETTERS　10　(4)　193-195　1985

    ISSN： 0146-9592

  941. HIGHLY EFFICIENT RAMAN AMPLIFICATION IN A POLARIZATION-PRESERVING OPTICAL FIBER Peer-reviewed

    M NAKAZAWA

    APPLIED PHYSICS LETTERS　46　(7)　628-630　1985

    DOI： 10.1063/1.95508 　

    ISSN： 0003-6951

  942. RAMAN AMPLIFICATION IN 1.4-1.5-MU-M SPECTRAL REGION IN POLARIZATION-PRESERVING OPTICAL FIBERS Peer-reviewed

    M NAKAZAWA, T NAKASHIMA, S SEIKAI

    JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS　2　(4)　515-521　1985

    ISSN： 0740-3224

    eISSN： 1520-8540

  943. SUM-FREQUENCY GENERATION IN A POLARIZATION-PRESERVING OPTICAL FIBER Peer-reviewed

    T NAKASHIMA, M NAKAZAWA, Y NEGISHI

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS　24　(5)　L308-L310　1985

    DOI： 10.1143/JJAP.24.L308 　

    ISSN： 0021-4922

  944. Polarization mode properties of an elliptical stress-cladding fiber Peer-reviewed

    NAKAZAWA Masataka

    Trans. IECE of Japan　E-68　277-283　1985

  945. POLARIZATION-MODE-COUPLING MEASUREMENTS ALONG A SPLICED POLARIZATION-PRESERVING FIBER USING A BACKSCATTERING TECHNIQUE Peer-reviewed

    M NAKAZAWA, N SHIBATA, T HORIGUCHI, S SEIKAI

    JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION　2　(7)　1066-1076　1985

    ISSN： 1084-7529

    eISSN： 1520-8532

  946. A NOVEL TECHNIQUE FOR REDUCING POLARIZATION NOISE IN OPTICAL-TIME DOMAIN REFLECTOMETERS FOR SINGLE-MODE FIBERS Peer-reviewed

    T HORIGUCHI, K SUZUKI, N SHIBATA, M NAKAZAWA, S SEIKAI

    JOURNAL OF LIGHTWAVE TECHNOLOGY　3　(4)　901-908　1985

    ISSN： 0733-8724

    eISSN： 1558-2213

  947. DEPENDENCE OF RAMAN GAIN ON RELATIVE INDEX DIFFERENCE FOR GEO2-DOPED SINGLE-MODE FIBERS Peer-reviewed

    T NAKASHIMA, S SEIKAI, M NAKAZAWA

    OPTICS LETTERS　10　(8)　420-422　1985

    ISSN： 0146-9592

    eISSN： 1539-4794

  948. Measurement of polarization mode-coupling along a polarization-preserving optical fiber using a backscattering technique Peer-reviewed

    NAKAZAWA Masataka

    Jpn Soc. of Opt.　14　350-358　1985

  949. 130 km fault location at 1.55 μm by using Er glass laser Peer-reviewed

    M. Nakazawa, M. Toku

    CLEO'84　WH2　1984/06

  950. Raman amplification for silica fiber(招待講演) Invited Peer-reviewed

    M. Nakazawa

    CLEO'84　FR2　1984/06

  951. OPTICAL-TIME DOMAIN REFLECTOMETER AT A 1.3 APPROXIMATELY 1.7-MU-M WAVELENGTH REGION Peer-reviewed

    M TOKUDA, M NAKAZAWA, T HORIGUCHI

    JAPAN ANNUAL REVIEWS IN ELECTRONICS COMPUTERS & TELECOMMUNICATIONS　11　179-194　1984

  952. ACTIVE TRANSMISSION-LINE - LIGHT AMPLIFICATION BY BACKWARD-STIMULATED RAMAN-SCATTERING IN POLARIZATION-MAINTAINING OPTICAL FIBER Peer-reviewed

    M NAKAZAWA, M TOKUDA, Y NEGISHI, N UCHIDA

    JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS　1　(1)　80-85　1984

    ISSN： 0740-3224

  953. CONTINUOUS-WAVE RAMAN OSCILLATION FOR A ND-3+-YAG INTRACAVITY FIBER LASER Peer-reviewed

    M NAKAZAWA, M TOKUDA, N UCHIDA

    JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS　1　(1)　86-90　1984

    ISSN： 0740-3224

  954. MEASUREMENTS OF POLARIZATION MODE COUPLINGS ALONG POLARIZATION-MAINTAINING SINGLE-MODE OPTICAL FIBERS Peer-reviewed

    M NAKAZAWA, N SHIBATA, M TOKUDA, Y NEGISHI

    JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION　1　(3)　285-292　1984

    ISSN： 0740-3232

  955. AN ACOUSTOOPTICAL DIRECTIONAL COUPLER FOR AN OPTICAL TIME-DOMAIN REFLECTOMETER Peer-reviewed

    T HORIGUCHI, M NAKAZAWA, M TOKUDA, N UCHIDA

    JOURNAL OF LIGHTWAVE TECHNOLOGY　2　(2)　108-115　1984

    ISSN： 0733-8724

  956. 1.55 MU-M OTDR FOR SINGLE-MODE OPTICAL FIBER LONGER THAN 110 KM Peer-reviewed

    M NAKAZAWA, M TOKUDA, Y MORISHIGE, H TORATANI

    ELECTRONICS LETTERS　20　(8)　323-325　1984

    DOI： 10.1049/el:19840219 　

    ISSN： 0013-5194

  957. OUTPUT-STABILIZED HIGH-REPETITION-RATE 1.545-MU-M Q-SWITCHED ER-GLASS LASER Peer-reviewed

    Y MORISHIGE, S KISHIDA, K WASHIO, H TORATANI, M NAKAZAWA

    OPTICS LETTERS　9　(5)　147-149　1984

    ISSN： 0146-9592

  958. 130-KM-LONG FAULT LOCATION FOR SINGLE-MODE OPTICAL FIBER USING 1.55-MU-M Q-SWITCHED ER.3+ - GLASS-LASER Peer-reviewed

    M NAKAZAWA, M TOKUDA, K WASHIO, Y ASAHARA

    OPTICS LETTERS　9　(7)　312-314　1984

    DOI： 10.1364/OL.9.000312 　

    ISSN： 0146-9592

  959. AN OPTOELECTRONIC SELF-OSCILLATORY CIRCUIT WITH AN OPTICAL FIBER DELAYED FEEDBACK AND ITS INJECTION LOCKING TECHNIQUE Peer-reviewed

    M NAKAZAWA, T NAKASHIMA, M TOKUDA

    JOURNAL OF LIGHTWAVE TECHNOLOGY　2　(5)　719-730　1984

    ISSN： 0733-8724

  960. EFFICIENT MULTIPLE VISIBLE-LIGHT GENERATION IN A POLARIZATION-PRESERVING OPTICAL FIBER PUMPED BY A 1.064-MU-M YTTRIUM ALUMINUM GARNET LASER Peer-reviewed

    M NAKAZAWA, T NAKASHIMA, S SEIKAI

    APPLIED PHYSICS LETTERS　45　(8)　823-825　1984

    DOI： 10.1063/1.95431 　

    ISSN： 0003-6951

  961. Lasing characteristics of a new type of laser with an ultralong optical fiber resonator

    M. Nakazawa, M. Tokuda, N. Uchida

    IOOC'83　29D3-16　1983/06

  962. Acoustooptical switch for fault location Peer-reviewed

    T. Horiguchi, M. Nakazawa, M. Tokuda

    IOOC'83　30B3-3　1983/06

  963. ANALYSES OF OPTICAL TIME-DOMAIN REFLECTOMETRY FOR SINGLE-MODE FIBERS AND OF POLARIZATION OPTICAL TIME-DOMAIN REFLECTOMETRY FOR POLARIZATION-MAINTAINING FIBERS Peer-reviewed

    M NAKAZAWA, M TOKUDA, N UCHIDA

    OPTICS LETTERS　8　(2)　130-132　1983

    ISSN： 0146-9592

  964. THEORY OF BACKWARD RAYLEIGH-SCATTERING IN POLARIZATION-MAINTAINING SINGLE-MODE FIBERS AND ITS APPLICATION TO POLARIZATION OPTICAL-TIME DOMAIN REFLECTOMETRY Peer-reviewed

    M NAKAZAWA

    IEEE JOURNAL OF QUANTUM ELECTRONICS　19　(5)　854-861　1983

    DOI： 10.1109/JQE.1983.1071932 　

    ISSN： 0018-9197

  965. LASING CHARACTERISTICS OF A ND-3+-YAG LASER WITH A LONG OPTICAL-FIBER RESONATOR Peer-reviewed

    M NAKAZAWA, M TOKUDA, N UCHIDA

    JOURNAL OF THE OPTICAL SOCIETY OF AMERICA　73　(6)　838-842　1983

    ISSN： 0030-3941

  966. MEASUREMENT TECHNIQUE FOR SINGLE-MODE OPTICAL FIBER Peer-reviewed

    M NAKAZAWA, K AOYAMA

    REVIEW OF THE ELECTRICAL COMMUNICATIONS LABORATORIES　31　(3)　290-298　1983

    ISSN： 0029-067X

  967. MEASUREMENT OF THE FIBER LOSS SPECTRUM USING FIBER RAMAN OPTICAL-TIME-DOMAIN REFLECTOMETRY Peer-reviewed

    M NAKAZAWA, M TOKUDA

    APPLIED OPTICS　22　(12)　1910-1914　1983

    ISSN： 0003-6935

  968. RAYLEIGH BACKSCATTERING THEORY FOR SINGLE-MODE OPTICAL FIBERS Peer-reviewed

    M NAKAZAWA

    JOURNAL OF THE OPTICAL SOCIETY OF AMERICA　73　(9)　1175-1180　1983

    ISSN： 0030-3941

  969. CONTINUUM SPECTRUM GENERATION IN A MULTIMODE FIBER USING 2 PUMP BEAMS AT 1.3-MU-M WAVELENGTH REGION Peer-reviewed

    M NAKAZAWA, M TOKUDA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS　22　(4)　L239-L241　1983

  970. MEASUREMENT OF POLARIZATION MODE-COUPLING ALONG A POLARIZATION-MAINTAINING OPTICAL FIBER USING A BACKSCATTERING TECHNIQUE Peer-reviewed

    M NAKAZAWA, M TOKUDA, Y NEGISHI

    OPTICS LETTERS　8　(10)　546-548　1983

    ISSN： 0146-9592

  971. Long distance fault location system for single-mode and multi-mode fibers with 1.32 μm YAG laser(招待講演) Invited Peer-reviewed

    M. Nakazawa, M. Tokuda, N. Uchida

    CLEO'82　WL4　1982/04

  972. OPTICAL-PHASE FLUCTUATIONS THERMALLY INDUCED IN A SINGLE-MODE OPTICAL FIBER Peer-reviewed

    T MUSHA, J KAMIMURA, M NAKAZAWA

    APPLIED OPTICS　21　(4)　694-698　1982

    DOI： 10.1364/AO.21.000694 　

    ISSN： 0003-6935

  973. OPTICAL-TIME DOMAIN REFLECTOMETRY AT A WAVELENGTH OF 1.5 MU-M USING STIMULATED RAMAN-SCATTERING IN MULTIMODE, GRADED-INDEX OPTICAL FIBER Peer-reviewed

    M NAKAZAWA, M TOKUDA, K WASHIO

    JOURNAL OF APPLIED PHYSICS　53　(3)　1391-1393　1982

    DOI： 10.1063/1.329869 　

    ISSN： 0021-8979

  974. FREQUENCY-CHARACTERISTICS OF SELF-SUSTAINED INTENSITY OSCILLATION OF A LASER DIODE USING A DELAYED ELECTRICAL FEEDBACK Peer-reviewed

    M NAKAZAWA

    IEEE JOURNAL OF QUANTUM ELECTRONICS　18　(7)　1050-1052　1982

    DOI： 10.1109/JQE.1982.1071654 　

    ISSN： 0018-9197

  975. CONTINUOUS-WAVE LASER OSCILLATION WITH AN ULTRALONG OPTICAL-FIBER RESONATOR Peer-reviewed

    M NAKAZAWA, M TOKUDA, N UCHIDA

    JOURNAL OF THE OPTICAL SOCIETY OF AMERICA　72　(10)　1338-1344　1982

    ISSN： 0030-3941

  976. FM ELIMINATED CH4 LOCKED FREQUENCY STABILIZATION OF 3.39 MU-M HE-NE-LASER IN DUAL FEEDBACK-CONTROL Peer-reviewed

    M NAKAZAWA, JI NAKAMURA, T MUSHA

    IEEE JOURNAL OF QUANTUM ELECTRONICS　17　(1)　103-108　1981

    DOI： 10.1109/JQE.1980.1070576 　

    ISSN： 0018-9197

  977. PHOTON PROBE FAULT LOCATOR FOR SINGLE-MODE OPTICAL FIBER USING AN ACOUSTOOPTICAL LIGHT DEFLECTOR Peer-reviewed

    M NAKAZAWA, T TANIFUJI, M TOKUDA, N UCHIDA

    IEEE JOURNAL OF QUANTUM ELECTRONICS　17　(7)　1264-1269　1981

    DOI： 10.1109/JQE.1981.1071250 　

    ISSN： 0018-9197

  978. POLARIZATION BEAT LENGTH MEASUREMENT IN A SINGLE-MODE OPTICAL FIBER BY BACKWARD RAYLEIGH-SCATTERING Peer-reviewed

    M NAKAZAWA, T HORIGUCHI, M TOKUDA, N UCHIDA

    ELECTRONICS LETTERS　17　(15)　513-515　1981

    DOI： 10.1049/el:19810359 　

    ISSN： 0013-5194

  979. SELF-SUSTAINED INTENSITY OSCILLATION OF A LASER DIODE INTRODUCED BY A DELAYED ELECTRICAL FEEDBACK USING AN OPTICAL FIBER AND AN ELECTRICAL AMPLIFIER Peer-reviewed

    M NAKAZAWA, M TOKUDA, N UCHIDA

    APPLIED PHYSICS LETTERS　39　(5)　379-381　1981

    DOI： 10.1063/1.92744 　

    ISSN： 0003-6951

  980. PRELIMINARY EXPERIMENT FOR OPTICAL HETERODYNE COMMUNICATION WITH A SINGLE-MODE OPTICAL FIBER BY USING FREQUENCY-STABILIZED HE-NE LASERS Peer-reviewed

    M NAKAZAWA, J KAMIMURA, T MUSHA

    OPTICS LETTERS　6　(10)　508-510　1981

    ISSN： 0146-9592

  981. MARKED EXTENSION OF DIAGNOSIS LENGTH IN OPTICAL-TIME DOMAIN REFLECTOMETRY USING 1.32-MU-M YAG LASER Peer-reviewed

    M NAKAZAWA, M TOKUDA, K WASHIO, Y MORISHIGE

    ELECTRONICS LETTERS　17　(21)　783-785　1981

    DOI： 10.1049/el:19810549 　

    ISSN： 0013-5194

  982. MEASUREMENT AND ANALYSIS ON POLARIZATION PROPERTIES OF BACKWARD RAYLEIGH-SCATTERING FOR SINGLE-MODE OPTICAL FIBERS Peer-reviewed

    M NAKAZAWA, T HORIGUCHI, M TOKUDA, N UCHIDA

    IEEE JOURNAL OF QUANTUM ELECTRONICS　17　(12)　2326-2334　1981

    ISSN： 0018-9197

  983. STABILITY MEASUREMENT OF THE 0.633 MU-M LINE IN A CH4-LOCKED 3.39 MU-M HE-NE-LASER Peer-reviewed

    M NAKAZAWA, T MUSHA

    JAPANESE JOURNAL OF APPLIED PHYSICS　19　(6)　L315-L317　1980

    DOI： 10.1143/JJAP.19.L315 　

    ISSN： 0021-4922

  984. STABILITY OF FM-ELIMINATED 3.39 MU-M HE-NE-CH4 LASER Peer-reviewed

    M NAKAZAWA, T MUSHA

    JAPANESE JOURNAL OF APPLIED PHYSICS　19　(6)　L327-L329　1980

    DOI： 10.1143/JJAP.19.L327 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  985. Frequency stabilization of a 3.39 μm He-Ne laser with no frequency modulation Peer-reviewed

    NAKAZAWA Masataka

    IECE of Japan　62-C　9-16　1979

  986. Observation of saturated absorption of the 3.39 μm line in an external CH4 cell Peer-reviewed

    NAKAZAWA Masataka

    Jpn. J. Appl. Phys.　18　597-602　1979

  987. Frequency-stabilized 3.39 μm He-Ne laser with no frequency modulation Peer-reviewed

    NAKAZAWA Masataka

    J. Appl. Phys.　50　2544-2547　1979

    DOI： 10.1063/1.326252 　

  988. Frequency stabilization of 0.633 μm line with the aid of 3.39-μm line locked to CH4 Peer-reviewed

    NAKAZAWA Masataka

    Appl. Phys. Lett.　35　745-747　1979

    DOI： 10.1063/1.90954 　

Show all ︎Show first 5

Misc. 260

  1. Performance comparison of injection-locked carrier frequency conversion and self-heterodyne detection methods in cohelently-linked optical and wireless transmission

    佐藤大晟, 佐藤大晟, 白幡晃一, 白幡晃一, 葛西恵介, 廣岡俊彦, 吉田真人, 中沢正隆

    電子情報通信学会技術研究報告(Web)　121　(320(OCS2021 33-40))　2022

    ISSN： 2432-6380

  2. Recent progress and challenges toward ultrahigh-speed transmission beyond 10 Tbit/s with optical Nyquist pulses

    Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka

    IEICE ELECTRONICS EXPRESS　18　(7)　2021/04

    DOI： 10.1587/elex.18.20212001 　

    ISSN： 1349-2543

  3. Single-channel 1.28 Tbit/s Optical Nyquist Pulse Transmission over 3000 km

    渡邊碧, 吉田真人, 廣岡俊彦, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2021　2021

    ISSN： 1349-144X

  4. Performance comparison between Fabry-Perot LD based- and ECLD based-injection-locking circuits

    葛西恵介, 管貴志, 吉田真人, 廣岡俊彦, 中沢正隆

    電子情報通信学会大会講演論文集(CD-ROM)　2021　2021

    ISSN： 1349-144X

  5. 10ペタビット級光伝送実験の成功 (特集 空間分割多重光通信技術の進展)

    相馬 大樹, 若山 雄太, 別府 翔平, 角田 聖也, 釣谷 剛宏, 林 哲也, 永島 拓志, 鈴木 雅人, 吉田 真人, 葛西 恵介, 中沢 正隆, 高橋 英憲, 五十嵐 浩司, 森田 逸郎, 鈴木 正敏

    O plus E : Optics + electronics　40　(6)　724-728　2018/09

    Publisher: アドコム・メディア

    ISSN： 0911-5943

  6. 80 Gbit/s, 256 QAM Digital Coherent Optical Transmission with Injection-Locking for Next Generation Mobile Fronthaul

    117　(423)　19-24　2018/01/29

    Publisher: 電子情報通信学会

    ISSN： 0913-5685

  7. High Spectral Efficient Transmission with Digital Coherent Ultra-multilevel QAM Format

    45　(12)　466-471　2016/12

    Publisher: 日本光学会

    ISSN： 0389-6625

  8. 光ファイバネットワークを利用した地殻変動および津波計測 (特集 防災とオプトメカトロニクス)

    中沢 正隆, 吉田 真人, 葛西 恵介

    光技術コンタクト = Optical and electro-optical engineering contact　54　(12)　22-31　2016/12

    Publisher: 光学工業技術協会

    ISSN： 0913-7289

  9. C-4-12 295 mW output, HCN frequency-stabilized CW erbium fiber ring laser

    Kasai Keisuke, Yoshida Masato, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2016　(1)　216-216　2016/03/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

  10. B-10-61 Q-factor analysis of dispersion and nonlinear impairments in ultrahigh-speed Nyquist pulse transmission

    Hirooka Toshihiko, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2016　(2)　354-354　2016/03/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

  11. B-10-52 320 Gbit/s, 256 QAM Coherent Optical Transmission over 160 km with an LD-based Injection-locked Homodyne Receiver

    Wang Yixin, Kasai Keisuke, Yoshida Masato, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2016　(2)　345-345　2016/03/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

  12. B-10-38 Real-time adaptive 4-64 QAM, 20-60 Gbit/s quantum noise stream cipher transmission

    Nakazawa Masataka, Yoshida Masato, Hirooka Toshihiko, Kasai Keisuke

    Proceedings of the IEICE General Conference　2016　(2)　331-331　2016/03/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

  13. CK-3-6 Optical and wireless-integrated next-generation access network based on coherent technologies

    Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2015　(2)　"SS-31"-"SS-32"　2015/08/25

    Publisher: The Institute of Electronics, Information and Communication Engineers

  14. B-10-43 80 Gbit/s, 256 QAM Coherent Optical Transmission over 150 km with an LD-based Injection-locked Homodyne Receiver

    Wang Yixin, Kasai Keisuke, Beppu Shohei, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2015　(2)　207-207　2015/08/25

    Publisher: The Institute of Electronics, Information and Communication Engineers

  15. B-10-45 448 Gbit/s, 32 Gbaud 128 QAM coherent transmission over 150 km with a potential spectral efficiency of 10.7 bit/s/Hz

    Kasai Keisuke, Wang Yixin, Otuya David Odeke, Yoshida Masato, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2015　(2)　209-209　2015/08/25

    Publisher: The Institute of Electronics, Information and Communication Engineers

  16. B-10-44 120 Gbil/s polarization-multiplexed 64 QAM digital coherent transmission in a deployed ROADM network

    Hirooka Toshihiko, Kasai Keisuke, Wang Yixin, Nakazawa Masataka, Shiraiwa Masaki, Awaji Yoshinari, Wada Naoya

    Proceedings of the Society Conference of IEICE　2015　(2)　208-208　2015/08/25

    Publisher: The Institute of Electronics, Information and Communication Engineers

  17. B-10-50 1024 QAM, 7-core (60 Gbit/s x 7) fiber transmission over 55 km with an aggregate spectral efficiency of 109 bit/s/Hz

    Yoshida Masato, Beppu Shohei, Kasai Keisuke, Hirooka Toshihiko, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2015　(2)　214-214　2015/08/25

    Publisher: The Institute of Electronics, Information and Communication Engineers

  18. B-10-57 QAM quantum noise stream cipher using digital coherent optical transmission

    Nakazawa Masataka, Yoshida Masato, Hirooka Toshihiko, Kasai Keisuke

    Proceedings of the Society Conference of IEICE　2015　(2)　221-221　2015/08/25

    Publisher: The Institute of Electronics, Information and Communication Engineers

  19. BI-3-4 Mode-coupling measurement along an optical fiber for space division multiplexed transmission using a multi-channel OTDR

    Nakazawa Masataka

    Proceedings of the IEICE General Conference　2015　(2)　"SS-65"-"SS-66"　2015/02/24

    Publisher: The Institute of Electronics, Information and Communication Engineers

  20. B-10-26 1.92 Tbit/s/ch, 64 QAM coherent Nyquist pulse transmission with a spectral efficiency of 10.6 bit/s/Hz

    Otuya David Odeke, Harako Koudai, Kasai Keisuke, Hirooka Toshihiko, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2015　(2)　362-362　2015/02/24

    Publisher: The Institute of Electronics, Information and Communication Engineers

  21. Resilient ICT research activities of ROEC at Tohoku University and its cooperation with NICT

    NAKAZAWA Masataka

    114　(287)　1-6　2014/11/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    The Great East Japan Earthquake revealed various difficulties in information and communication infrastructures in the wake of a devastating disaster, such as transmission link disruption, disabilities in information collection, and lack of messages. It is therefore indispensable to construct disaster-resilient ICT networks to cope with next unpredictable disasters. In this talk, we describe our activities on resilient ICT technologies in Research Organization of Electrical Communication (ROEC) at Tohoku University and cooperation with Resilient ICT Research Center at NICT. In particular, we focus on our recent attempts toward constructing disaster-resilient optical networks.

  22. High-performance TDM demultiplexing of coherent Nyquist pulses using time-domain orthogonality

    HARAKO Koudai, OTUYA David Odeke, KASAI Keisuke, HIROOKA Toshihiko, NAKAZAWA Masataka

    Technical report of IEICE. OCS　114　(281)　97-100　2014/10/30

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    We propose a simple and high-performance scheme for demultiplexing coherent Nyquist TDM signals by photo-mixing on a photo-detector with Nyquist LO pulses. This scheme takes advantage of the time-domain orthogonality of Nyquist pulses, which enables high-SNR demultiplexing and homodyne detection simultaneously in spite of a strong overlap with adjacent pulses in the time domain. The feasibility of this scheme is demonstrated through a demultiplexing experiment employing 80 Gbaud, 64 QAM Nyquist pulse OTDM signals. This scheme exhibits excellent demultiplexing performance with a much simpler configuration than a conventional ultrafast all-optical sampling scheme.

  23. B-10-43 2048 QAM (66 Gbit/s) Digital Coherent Optical Transmission over 150 km

    Beppu Shohei, Kasai Keisuke, Yoshida Masato, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2014　(2)　411-411　2014/03/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

  24. B-10-29 High Speed, Low Penalty Optical Demultiplexing Using Nonlinear Optical Loop Mirror With a Nyquist Control Pulse

    Seya Daiki, Harako Kodai, Hirooka Toshihiko, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2014　(2)　397-397　2014/03/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

  25. B-10-28 100 Gbit/s real-time digital coherent transmission over a 32 km multi-mode graded-index fiber

    Hirooka Toshihiko, Nakazawa Masataka, Komukai Tetsuro, Sakano Toshikazu

    Proceedings of the IEICE General Conference　2014　(2)　396-396　2014/03/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

  26. Recent Trends in Multilevel and Multimode Technologies

    NAKAZAWA Masataka, KOKUBUN Yasuo

    The Journal of the Institute of Electronics, Information, and Communication Engineers　97　(2)　119-123　2014/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5693

  27. A 120 Gbit/s, 64 QAM coherent transmission over 150 km employing an optical voltage controlled oscillator

    Wang Yixin, Kasai Keisuke, Omiya Tatsunori, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2013　(2)　243-243　2013/09/03

    Publisher: The Institute of Electronics, Information and Communication Engineers

  28. 1.28 Tbit/s-58 km single-channel transmmission at 1.1μm

    Koizumi Kengo, Yoshida Masato, Hirooka Toshihiko, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2013　(2)　240-240　2013/09/03

    Publisher: The Institute of Electronics, Information and Communication Engineers

  29. 光多値化技術とさらなる周波数利用効率向上に向けて (特集 光ファイバー通信の新たなブレークスルーへ向けて)

    中沢 正隆, 廣岡 俊彦, 吉田 真人

    O plus E : Optics・Electronics　35　(8)　836-841　2013/08

    Publisher: アドコム・メディア

    ISSN： 0911-5943

  30. B-10-26 AStudy on the Optimization of 7-core Multicore Erbium-doped Fiber Optical Amplifier

    Tsuchida Yukihiro, Maeda Koichi, Watanabe Kengo, Ito Toshiharu, Fukuchi Kiyoshi, Yoshida Masato, Mimura Yu, Sugizaki Ryuichi, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2013　(2)　357-357　2013/03/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

  31. TK-3-7 Optical Transmission Technologies for Enhancing the Resilience of Information and Communication Networks

    Morita Itsuro, Yoshikane Noboru, Tsuritani Takehiro, Hirooka Toshihiko, Yoshida Masato, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2013　(2)　"SSS-30"-"SSS-31"　2013/03/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

  32. B-10-67 1024 QAM (60 Gbit/s) optical coherent transmission over 150 km

    Koizumi Yuki, Toyoda Kazushi, Yoshida Masato, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2012　(2)　249-249　2012/08/28

    Publisher: The Institute of Electronics, Information and Communication Engineers

  33. B-10-66 Highly dispersion-tolerant 160 Gbaud optical Nyquist pulse TDM transmission over 525 km

    Hirooka Toshihiko, Ruan Peng, Guan Pengyu, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2012　(2)　248-248　2012/08/28

    Publisher: The Institute of Electronics, Information and Communication Engineers

  34. B-10-90 An LD-based optical phase-locked loop circuit by using an optical voltage controlled oscillator

    Kasai Keisuke, Wang Yixin, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2012　(2)　272-272　2012/08/28

    Publisher: The Institute of Electronics, Information and Communication Engineers

  35. B-10-34 Marked performance improvement of 256 QAM transmission using a digital back-propagation method

    Toyoda Kazushi, Koizumi Yuki, Omiya Tatsunori, Yoshida Masato, Hirooka Toshihiko, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2012　(2)　216-216　2012/08/28

    Publisher: The Institute of Electronics, Information and Communication Engineers

  36. B-10-35 Performance improvement of 512 QAM transmission using frequency-domain equalization

    Omiya Tatsunori, Koizumi Yuki, Toyoda Kazushi, Yoshida Masato, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2012　(2)　217-217　2012/08/28

    Publisher: The Institute of Electronics, Information and Communication Engineers

  37. B-10-62 1.1 μm, 160 Gbit/s OTDM transmission over 30 km

    Koizumi Kengo, Hirooka Toshihiko, Yoshida Masato, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2012　(2)　244-244　2012/08/28

    Publisher: The Institute of Electronics, Information and Communication Engineers

  38. Performance improvement of optical frequency stabilized Cs optical atomic clock

    TOKUHIRA Kazunari, SUZUKI Fumitaka, YOSHIDA Masato, NAKAZAWA Masataka

    IEICE technical report. Component parts and materials　112　(182)　21-25　2012/08/16

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    We have proposed a Cs optical atomic clock, which generates a standard microwave clock signal with an optical pulse. The clock source uses a regenerative mode-locked fiber laser (MLFL) as a microwave oscillator and an optically pumped Cs gas cell as a frequency standard. In this report, the output pulse width was shortened from 7.1 to 3.4 ps by employing a phase modulator instead of an intensity modulator as a mode-locker. The optical frequency stability for an averaging time of 100 s was also improved from 1.8 x 10^<-11> to 6.3 x 10^<-12> by precisely controlling the laser cavity temperature.

  39. 1.07μm passively mode-locked ytterbium-doped fiber laser with SWNT/PMMA saturable absorber

    YOSHIDA Masato, HORI Yuichiro, HIROOKA Toshihiko, NAKAZAWA Masataka

    IEICE technical report. Component parts and materials　112　(182)　83-86　2012/08/16

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    Single-wall carbon nanotubes (SWNT) have received considerable attention as a nonlinear optical material for ultrashort lasers and optical switch devices because of their attractive features such as ultrafast saturable absorption (SA) effects with a recovery time of faster than 1 ps. The SA wavelength depends on the tube diameter. We previously reported an SWNT polymer material that used polymethylmethacrylate (PMMA) and applied it to a passively mode-locked Er fiber laser for 171 fs pulse generation at 1.55 μm. In this report, we describe a mode-locked Yb-doped fiber laser for femtosecond pulse generation at 1.1 μm realized by using an SWNT/PMMA wafer in the cavity. By optimizing the cavity configuration as a dispersion-managed soliton laser, we obtained a 543 fs, 15.1 MHz pulse train.

  40. Increase of Output Power of Passively Mode-Locked Fiber Laser with a SWNT

    ONO Takato, HORI Yuichiro, YOSHIDA Masato, HIROOKA Toshihiko, NAKAZAWA Masataka, MATA Junji, TSUKAMOTO Jun

    IEICE technical report. Component parts and materials　112　(182)　87-90　2012/08/16

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    We have demonstrated a passively mode-locked fiber laser with SWNT-based saturable absorbers made by uniformly dispersing SWNTs into polymer such as poly methyl methacrylate, or by depositing SWNTs on the optical fiber end. However, the output power of the lasers is limited to less than 10 mW due to relatively low tolerance to optical damage of these SWNT-based saturable absorbers. In this work, we fabricated a SWNT saturable absorber with a substantial increase in the optical damage threshold by sealing SWNT with siloxane which has a high heat resistance. By installing this saturable absorber in a passively mode-locked fiber laser, a 31 mW, 280 fs ultrashort pulse was successfully generated.

  41. Performance improvement of optical frequency stabilized Cs optical atomic clock

    TOKUHIRA Kazunari, SUZUKI Fumitaka, YOSHIDA Masato, NAKAZAWA Masataka

    IEICE technical report. Reliability　112　(180)　21-25　2012/08/16

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    We have proposed a Cs optical atomic clock, which generates a standard microwave clock signal with an optical pulse. The clock source uses a regenerative mode-locked fiber laser (MLFL) as a microwave oscillator and an optically pumped Cs gas cell as a frequency standard. In this report, the output pulse width was shortened from 7.1 to 3.4 ps by employing a phase modulator instead of an intensity modulator as a mode-locker. The optical frequency stability for an averaging time of 100 s was also improved from 1.8 x 10^<-11> to 6.3 x 10^<-12> by precisely controlling the laser cavity temperature.

  42. 1.07μm passively mode-locked ytterbium-doped fiber laser with SWNT/PMMA saturable absorber

    YOSHIDA Masato, HORI Yuichiro, HIROOKA Toshihiko, NAKAZAWA Masataka

    IEICE technical report. Reliability　112　(180)　83-86　2012/08/16

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    Single-wall carbon nanotubes (SWNT) have received considerable attention as a nonlinear optical material for ultrashort lasers and optical switch devices because of their attractive features such as ultrafast saturable absorption (SA) effects with a recovery time of faster than 1 ps. The SA wavelength depends on the tube diameter. We previously reported an SWNT polymer material that used polymethylmethacrylate (PMMA) and applied it to a passively mode-locked Er fiber laser for 171 fs pulse generation at 1.55 μm. In this report, we describe a mode-locked Yb-doped fiber laser for femtosecond pulse generation at 1.1 μm realized by using an SWNT/PMMA wafer in the cavity. By optimizing the cavity configuration as a dispersion-managed soliton laser, we obtained a 543 fs, 15.1 MHz pulse train.

  43. Increase of Output Power of Passively Mode-Locked Fiber Laser with a SWNT

    ONO Takato, HORI Yuichiro, YOSHIDA Masato, HIROOKA Toshihiko, NAKAZAWA Masataka, MATA Junji, TSUKAMOTO Jun

    IEICE technical report. Reliability　112　(180)　87-90　2012/08/16

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    We have demonstrated a passively mode-locked fiber laser with SWNT-based saturable absorbers made by uniformly dispersing SWNTs into polymer such as poly methyl methacrylate, or by depositing SWNTs on the optical fiber end. However, the output power of the lasers is limited to less than 10 mW due to relatively low tolerance to optical damage of these SWNT-based saturable absorbers. In this work, we fabricated a SWNT saturable absorber with a substantial increase in the optical damage threshold by sealing SWNT with siloxane which has a high heat resistance. By installing this saturable absorber in a passively mode-locked fiber laser, a 31 mW, 280 fs ultrashort pulse was successfully generated.

  44. Performance improvement of optical frequency stabilized Cs optical atomic clock

    TOKUHIRA Kazunari, SUZUKI Fumitaka, YOSHIDA Masato, NAKAZAWA Masataka

    IEICE technical report. EMD　112　(181)　21-25　2012/08/16

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    We have proposed a Cs optical atomic clock, which generates a standard microwave clock signal with an optical pulse. The clock source uses a regenerative mode-locked fiber laser (MLFL) as a microwave oscillator and an optically pumped Cs gas cell as a frequency standard. In this report, the output pulse width was shortened from 7.1 to 3.4 ps by employing a phase modulator instead of an intensity modulator as a mode-locker. The optical frequency stability for an averaging time of 100 s was also improved from 1.8 x 10^<-11> to 6.3 x 10^<-12> by precisely controlling the laser cavity temperature.

  45. Performance improvement of optical frequency stabilized Cs optical atomic clock

    TOKUHIRA Kazunari, SUZUKI Fumitaka, YOSHIDA Masato, NAKAZAWA Masataka

    Technical report of IEICE. OPE　112　(183)　21-25　2012/08/16

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    We have proposed a Cs optical atomic clock, which generates a standard microwave clock signal with an optical pulse. The clock source uses a regenerative mode-locked fiber laser (MLFL) as a microwave oscillator and an optically pumped Cs gas cell as a frequency standard. In this report, the output pulse width was shortened from 7.1 to 3.4 ps by employing a phase modulator instead of an intensity modulator as a mode-locker. The optical frequency stability for an averaging time of 100 s was also improved from 1.8 x 10^<-11> to 6.3 x 10^<-12> by precisely controlling the laser cavity temperature.

  46. 1.07μm passively mode-locked ytterbium-doped fiber laser with SWNT/PMMA saturable absorber

    YOSHIDA Masato, HORI Yuichiro, HIROOKA Toshihiko, NAKAZAWA Masataka

    IEICE technical report. EMD　112　(181)　83-86　2012/08/16

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    Single-wall carbon nanotubes (SWNT) have received considerable attention as a nonlinear optical material for ultrashort lasers and optical switch devices because of their attractive features such as ultrafast saturable absorption (SA) effects with a recovery time of faster than 1 ps. The SA wavelength depends on the tube diameter. We previously reported an SWNT polymer material that used polymethylmethacrylate (PMMA) and applied it to a passively mode-locked Er fiber laser for 171 fs pulse generation at 1.55 μm. In this report, we describe a mode-locked Yb-doped fiber laser for femtosecond pulse generation at 1.1 μm realized by using an SWNT/PMMA wafer in the cavity. By optimizing the cavity configuration as a dispersion-managed soliton laser, we obtained a 543 fs, 15.1 MHz pulse train.

  47. Increase of Output Power of Passively Mode-Locked Fiber Laser with a SWNT

    ONO Takato, HORI Yuichiro, YOSHIDA Masato, HIROOKA Toshihiko, NAKAZAWA Masataka, MATA Junji, TSUKAMOTO Jun

    IEICE technical report. EMD　112　(181)　87-90　2012/08/16

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    We have demonstrated a passively mode-locked fiber laser with SWNT-based saturable absorbers made by uniformly dispersing SWNTs into polymer such as poly methyl methacrylate, or by depositing SWNTs on the optical fiber end. However, the output power of the lasers is limited to less than 10 mW due to relatively low tolerance to optical damage of these SWNT-based saturable absorbers. In this work, we fabricated a SWNT saturable absorber with a substantial increase in the optical damage threshold by sealing SWNT with siloxane which has a high heat resistance. By installing this saturable absorber in a passively mode-locked fiber laser, a 31 mW, 280 fs ultrashort pulse was successfully generated.

  48. Performance improvement of optical frequency stabilized Cs optical atomic clock

    TOKUHIRA Kazunari, SUZUKI Fumitaka, YOSHIDA Masato, NAKAZAWA Masataka

    Technical report of IEICE. LQE　112　(184)　21-25　2012/08/16

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    We have proposed a Cs optical atomic clock, which generates a standard microwave clock signal with an optical pulse. The clock source uses a regenerative mode-locked fiber laser (MLFL) as a microwave oscillator and an optically pumped Cs gas cell as a frequency standard. In this report, the output pulse width was shortened from 7.1 to 3.4 ps by employing a phase modulator instead of an intensity modulator as a mode-locker. The optical frequency stability for an averaging time of 100 s was also improved from 1.8 x 10^<-11> to 6.3 x 10^<-12> by precisely controlling the laser cavity temperature.

  49. 1.07μm passively mode-locked ytterbium-doped fiber laser with SWNT/PMMA saturable absorber

    YOSHIDA Masato, HORI Yuichiro, HIROOKA Toshihiko, NAKAZAWA Masataka

    Technical report of IEICE. OPE　112　(183)　83-86　2012/08/16

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    Single-wall carbon nanotubes (SWNT) have received considerable attention as a nonlinear optical material for ultrashort lasers and optical switch devices because of their attractive features such as ultrafast saturable absorption (SA) effects with a recovery time of faster than 1 ps. The SA wavelength depends on the tube diameter. We previously reported an SWNT polymer material that used polymethylmethacrylate (PMMA) and applied it to a passively mode-locked Er fiber laser for 171 fs pulse generation at 1.55 μm. In this report, we describe a mode-locked Yb-doped fiber laser for femtosecond pulse generation at 1.1 μm realized by using an SWNT/PMMA wafer in the cavity. By optimizing the cavity configuration as a dispersion-managed soliton laser, we obtained a 543 fs, 15.1 MHz pulse train.

  50. Increase of Output Power of Passively Mode-Locked Fiber Laser with a SWNT

    ONO Takato, HORI Yuichiro, YOSHIDA Masato, HIROOKA Toshihiko, NAKAZAWA Masataka, MATA Junji, TSUKAMOTO Jun

    Technical report of IEICE. OPE　112　(183)　87-90　2012/08/16

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    We have demonstrated a passively mode-locked fiber laser with SWNT-based saturable absorbers made by uniformly dispersing SWNTs into polymer such as poly methyl methacrylate, or by depositing SWNTs on the optical fiber end. However, the output power of the lasers is limited to less than 10 mW due to relatively low tolerance to optical damage of these SWNT-based saturable absorbers. In this work, we fabricated a SWNT saturable absorber with a substantial increase in the optical damage threshold by sealing SWNT with siloxane which has a high heat resistance. By installing this saturable absorber in a passively mode-locked fiber laser, a 31 mW, 280 fs ultrashort pulse was successfully generated.

  51. 1.07μm passively mode-locked ytterbium-doped fiber laser with SWNT/PMMA saturable absorber

    YOSHIDA Masato, HORI Yuichiro, HIROOKA Toshihiko, NAKAZAWA Masataka

    Technical report of IEICE. LQE　112　(184)　83-86　2012/08/16

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    Single-wall carbon nanotubes (SWNT) have received considerable attention as a nonlinear optical material for ultrashort lasers and optical switch devices because of their attractive features such as ultrafast saturable absorption (SA) effects with a recovery time of faster than 1 ps. The SA wavelength depends on the tube diameter. We previously reported an SWNT polymer material that used polymethylmethacrylate (PMMA) and applied it to a passively mode-locked Er fiber laser for 171 fs pulse generation at 1.55 μm. In this report, we describe a mode-locked Yb-doped fiber laser for femtosecond pulse generation at 1.1 μm realized by using an SWNT/PMMA wafer in the cavity. By optimizing the cavity configuration as a dispersion-managed soliton laser, we obtained a 543 fs, 15.1 MHz pulse train.

  52. Increase of Output Power of Passively Mode-Locked Fiber Laser with a SWNT

    ONO Takato, HORI Yuichiro, YOSHIDA Masato, HIROOKA Toshihiko, NAKAZAWA Masataka, MATA Junji, TSUKAMOTO Jun

    Technical report of IEICE. LQE　112　(184)　87-90　2012/08/16

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    We have demonstrated a passively mode-locked fiber laser with SWNT-based saturable absorbers made by uniformly dispersing SWNTs into polymer such as poly methyl methacrylate, or by depositing SWNTs on the optical fiber end. However, the output power of the lasers is limited to less than 10 mW due to relatively low tolerance to optical damage of these SWNT-based saturable absorbers. In this work, we fabricated a SWNT saturable absorber with a substantial increase in the optical damage threshold by sealing SWNT with siloxane which has a high heat resistance. By installing this saturable absorber in a passively mode-locked fiber laser, a 31 mW, 280 fs ultrashort pulse was successfully generated.

  53. 32 RZ/QAM coherent optical transmission employing an RZ-CW conversion technique

    KASAI Keisuke, OTUYA David Odeke, YOSHIDA Masato, HIROOKA Toshihiko, NAKAZAWA Masataka

    Technical report of IEICE. OCS　112　(152)　13-18　2012/07/19

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    Coherent optical time division multiplexing (OTDM) transmission with a multi-level modulation format has attracted a lot of attention as a ultra-high speed and highly spectral-efficient optical transmission system. However, in the conventional coherent OTDM, it is difficult to demodulate an ultra-high speed, multi-level RZ data signal with a high signal to noise ratio due to input optical power limitation of coherent detection circuits. Recently, we proposed a demodulation scheme by using an RZ-CW conversion scheme in a coherent receiver, in which the transmitted coherent RZ data are OTDM demultiplexed and converted into a data signal on a CW carrier. In this paper, we demonstrate an advantage of the scheme with 10 Gsymbol/s, 4- and 8-OTDM 32 RZ/QAM demodulation experiments. Furthermore, we have successfully transmitted a polarization multiplexed, 10 Gsymbol/s, 32 RZ/QAM (800 Git/s) data signal over 225 km by using this conversion scheme.

  54. Demultiplexing of 160Gbit/s OTDM signal using a nonlinear optical loop mirror at 1.1μm

    KOIZUMI Kengo, HIROOKA Toshihiko, YOSHIDA Masato, NAKAZAWA Masataka

    Technical report of IEICE. OCS　112　(86)　47-52　2012/06/14

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

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    With the increasing demand for ultrahigh capacity optical networks, it has been increasingly important to exploit new transmission bandwidths beyond the 1.55 and 1.31μm bands. The 1.1μm region is expected to provide an ultrawide transmission band because a wideband ytterbium (Yb)-doped fiber amplifiers (YDFA) are available. In this talk, we describe a multiplexer and demultiplexer using a nonlinear optical loop mirror (NOLM), and demonstrate the generation and demultiplexing of a 160 Gbit/s optical time-division multiplexed (OTDM) signal using a 10 GHz mode-locked Yb fiber laser in the 1.1μm wavelength region.

  55. Depolarization-Induced Crosstalk in Polarization-Multiplexed Transmission and Its Impact on Ultrahigh-Speed Optical Transmission

    HIROOKA Toshihiko, HARAKO Koudai, GUAN Pengyu, NAKAZAWA Masataka

    Technical report of IEICE. OCS　112　(42)　1-4　2012/05/11

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

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    Ultrashort optical pulses such as used in a single-channel Terabit/s OTDM transmission suffers from significant transmission impairments due to second-order PMD, i.e., signal depolarization due to frequency dependence of a principal state of polarization, even when the first-order PMD is completely compensated. In particular, in polarization-multiplexed transmission, depolarization leads to a complicated form of inter-polarization crosstalk, which prevents one from complete separation of the two channels. In this paper, we shall present an analytical expression and experimental demonstration of depolarization-induced crosstalk in polarization-multiplexed transmission caused by second-order PMD. It is found that the crosstalk depends on the fourth power of the bandwidth and the square of distance.

  56. B-10-34 Ultrahigh-speed orthogonal TDM transmission with an optical Nyquist pulse train

    Nakazawa Masataka, Hirooka Toshihiko, Ruan Peng, Guan Pengyu

    Proceedings of the IEICE General Conference　2012　(2)　357-357　2012/03/06

    Publisher: The Institute of Electronics, Information and Communication Engineers

  57. B-10-33 400 Gbit/s Frequency-Division-Multiplexed and Polarization-Multiplexed 256 QAM-OFDM Transmission over 400 km

    Omiya Tatsunori, Toyoda Kazushi, Yoshida Masato, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2012　(2)　356-356　2012/03/06

    Publisher: The Institute of Electronics, Information and Communication Engineers

  58. B-10-54 Single-channel 800 Gbit/s, 32 RZ/QAM coherent transmission employing an RZ-CW conversion technique

    Kasai Keisuke, Odeke Otuya David, Yoshida Masato, Hirooka Toshihiko, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2012　(2)　377-377　2012/03/06

    Publisher: The Institute of Electronics, Information and Communication Engineers

  59. B-10-70 Demultiplexing of 160 Gbit/s OTDM signal using a nonlinear optical loop mirror at 1.1μm

    Koizumi Kengo, Hirooka Toshihiko, Yoshida Masato, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2012　(2)　393-393　2012/03/06

    Publisher: The Institute of Electronics, Information and Communication Engineers

  60. One Year after the Great East Japan Earthquake Disaster

    NAKAZAWA Masataka

    The Journal of the Institute of Electronics, Information, and Communication Engineers　95　(3)　188-194　2012/03/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5693

  61. B-10-50 120 Gbit/s, 64 QAM Coherent Transmission over 150 km with OPLL Employing Narrow Linewidth LDs

    Wang Yixin, Kasai Keisuke, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2011　(2)　263-263　2011/08/30

    Publisher: The Institute of Electronics, Information and Communication Engineers

  62. B-10-49 Comparison between Polarization-Multiplexed DPSK and Single-Polarization DQPSK in 1.28Tbit/s/ch-525 km Transmission

    Tomiyama Yutaro, Harako Koudai, Guan Pengyu, Hirooka Toshihiko, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2011　(2)　262-262　2011/08/30

    Publisher: The Institute of Electronics, Information and Communication Engineers

  63. BI-7-8 512 QAM ultra-multilevel digital coherent optical transmission

    Koizumi Yuki, Toyoda Kazushi, Yoshida Masato, Hirooka Toshihiko, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2011　(1)　"SS-67"-"SS-68"　2011/08/30

    Publisher: The Institute of Electronics, Information and Communication Engineers

  64. Oscillation characteristics of an ^<13>C_2H_2 frequency-stabilized λ/4-shifted DFB LD with an external fiber ring cavity

    KASAI Keisuke, NAKAZAWA Masataka

    IEICE technical report　111　(185)　49-52　2011/08/18

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    We demonstrate frequency stabilization of a λ/4-shifted distributed feedback laser diode (DFB LD) with an external fiber ring cavity to an ^<13>C_2H_2 (acetylene) linear absorption line. By employing a feedback control of the λ/4-shifted DFB passband to track one Fabry-Perot mode associated with the fiber ring cavity, we have successfully tuned an oscillation frequency over 1.2 GHz without mode-hopping. The optical frequency was stabilized to a ^<13>C_2H_2 absorption line with an external frequency modulation scheme, which realizes an FM-eliminated output beam. The frequency stabilities reached as high as 1.4×10^<-10> for τ=1 s and 1.3×10^<-11> for τ=100 s. Furthermore, a linewidth of 2.6 kHz and a relative intensity noise of less than -135 dB/Hz were simultaneously achieved.

  65. Development of FPGA-based real-time receiver for 64 QAM coherent signals

    YOSHIDA Masato, OMIYA Tatsunori, KASAI Keisuke, NAKAZAWA Masataka

    IEICE technical report　111　(122)　7-12　2011/07/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

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    We demonstrate the first real-time coherent optical transmission of a 1 Gsymbol/s, 64 QAM data signal. The real-time coherent receiver consists of four 1 GS/s analog-to-digital converters (ADC) and a field-programmable gate array (FPGA) implementation. The bit error rate (BER) performance obtained with the real-time receiver is the same as that obtained with an off-line digital signal processor (DSP). This result indicates that the phase of the IF signal and the data clock timing are precisely controlled without any DSP compensations in our real-time coherent transmission system. As a result, an error free performance (BER < 1 x 10<-12>) has been achieved under a back-to-back condition.

  66. Frequency Division Multiplexing 64 QAM-OFDM (420 Gb/s) transmission over 160 km

    OMIYA Tatsunori, TOYODA Kazushi, KASAI Keisuke, YOSHIDA Masato, NAKAZAWA Masataka

    IEICE technical report　111　(122)　93-98　2011/07/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    We have demonstrated 64QAM-OFDM coherent optical transmission with a C_2H_2 frequency-stabilized fiber laser and an optical phase-locked loop (OPLL) circuit. In this report, we describe experimental result of 7ch-frequency-division-multiplexed and polarization-multiplexed 5 Gsymbol/s 64 QAM-OFDM (420 Gb/s) transmission. After 160 km transmission, we applied compensation for impairments due to fiber nonlinearity by using back propagation method and improved the bit error rate (BER) performance. As a result, a BER below the forward error correction (FEC) limit and a spectral efficiency as high as 10.4 b/s/Hz were successfully demonstrated.

  67. C-3-17 Femtosecond fiber soliton lasers using a CNT saturable absorber

    Hori Yuichiro, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2011　(1)　192-192　2011/02/28

    Publisher: The Institute of Electronics, Information and Communication Engineers

  68. B-10-27 PMD-Induced Crosstalk in the Presence of PDL in a Polarization-Multiplexed Ultrahigh-Speed Transmission

    Hirooka Toshihiko, Hirano Toshiyuki, Guan Pengyu, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2011　(2)　336-336　2011/02/28

    Publisher: The Institute of Electronics, Information and Communication Engineers

  69. B-10-82 640 Gbit/s Clock Recovery Using Time-Domain Optical Fourier Transformation and Narrow-Band Optical Filter

    Guan Pengyu, Mulvad Hans Christian Hansen, Kasai Keisuke, Hirooka Toshihiko, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2011　(2)　391-391　2011/02/28

    Publisher: The Institute of Electronics, Information and Communication Engineers

  70. B-10-39 512 QAM (54 Gbit/s) coherent optical transmission over 150 km

    Okamoto Seiji, Toyoda Kazushi, Omiya Tatsunori, Kasai Keisuke, Yoshida Masato, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2011　(2)　348-348　2011/02/28

    Publisher: The Institute of Electronics, Information and Communication Engineers

  71. Special Section on Extremely Advanced Optical Transmission Technologies and Transmission Optical Fiber Technologies towards Exabit Era FOREWORD

    Masataka Nakazawa

    IEICE TRANSACTIONS ON COMMUNICATIONS　E94B　(2)　375-375　2011/02

    ISSN： 0916-8516

    eISSN： 1745-1345

  72. Performance improvement of 10Gsymbol/s, 64 QAM coherent optical transmission by using back propagation method of nonlinear Schrodinger equation

    TOYODA Kazushi, OKAMOTO Seiji, OMIYA Tatsunori, YOSHIDA Masato, HIROOKA Toshihiko, NAKAZAWA Masataka

    IEICE technical report　110　(392)　67-72　2011/01/20

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

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    We have demonstrated 64〜512 QAM coherent optical transmission using a C_2H_2 frequency-stabilized fiber laser and an OPLL circuit. In such a ultra multi-level transmission, compensation for impairments due to fiber dispersion and nonlinearity plays a very important role. As a highly precise compensation scheme, a back propagation method of the nonlinear Schrodinger equation has been proposed. We applied this scheme to a single-polarization, 10 Gsymbol/s, 64 QAM transmission and demonstrated the impairment compensation both numerically and experimentally.

  73. C-4-21 A femtosecond fiber soliton laser at 1.1 μm band using SWNT-coated polyimide film as a saturable absorber

    Hori Yuichiro, Shohda Fumio, Nakazawa Masataka, Mata Junji, Tsukamoto Jun

    Proceedings of the Society Conference of IEICE　2010　(1)　211-211　2010/08/31

    Publisher: The Institute of Electronics, Information and Communication Engineers

  74. B-10-79 Performance improvement of 10 Gsymbol/s, 64QAM coherent optical transmission by using back propagation method of nonlinear Schrodinger equation

    Toyoda Kazushi, Okamoto Seiji, Omiya Tatsunori, Yoshida Masato, Hirooka Toshihiko, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2010　(2)　266-266　2010/08/31

    Publisher: The Institute of Electronics, Information and Communication Engineers

  75. Single-channel 400Gbit/s, OTDM-32 RZ/QAM coherent transmission over 225km

    KASAI Keisuke, OMIYA Tatsunori, GUAN Pengyu, YOSHIDA Masato, HIROOKA Toshihiko, NAKAZAWA Masataka

    IEICE technical report　110　(94)　1-6　2010/06/17

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

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    Coherent optical time division multiplexing (OTDM) transmission with a multi-level modulation format based on digital signal processing (DSP) has attracted a lot of attention with a view to expanding the capacity per channel of wavelength division multiplexing (WDM) transmission systems. This transmission system can overcome the speed and bandwidth limitations of electrical components such as A/D and D/A converters and realize ultrahigh-speed coherent transmission by using a multi-level amplitude and phase-modulated coherent RZ pulse and the OTDM. However, in a conventional coherent OTDM system, the optical phase between an RZ data pulse and a local oscillator are not phase-locked. Therefore, it is difficult to realize a coherent OTDM transmission with high multiplicity. In this work, we demonstrated a multi-level coherent OTDM transmission with a high-precision optical phase-locked loop (OPLL) technique by using optical comb generation circuits. 400 Gbit/s data (polarization-multiplexed, 10 Gsymbol/s, 4-OTDM 32 RZ/QAM) were successfully transmitted over 225 km with a bit error rate performance below the forward error correction (FEC) limit. We also realized a 320 Gbit/s-450 km transmission with an OTDM 16 RZ/QAM scheme.

  76. CS-6-2 Ultra-Multilevel Coherent Optical Fiber Transmission Approaching the Shannon Limit

    Nakazawa Masataka

    Proceedings of the IEICE General Conference　2010　(2)　"S-31"-"S-32"　2010/03/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

  77. CS-6-3 Frequency-stabilized lasers and an optical phase-lock technique for ultra-multilevel coherent transmission

    Kasai Keisuke, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2010　(2)　"S-33"-"S-34"　2010/03/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

  78. B-10-89 640Gbit/s/channel-525km single-polarization DPSK transmission with ultrafast time-domain optical Fourier transformation circuit

    Hirano Toshiyuki, Guan Pengyu, Hirooka Toshihiko, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2010　(2)　427-427　2010/03/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

  79. B-10-62 Optical phase-locked loop for coherent OTDM transmission with an optical comb technique

    Yoshida Masato, Kasai Keisuke, Omiya Tatsunori, Guan Pengyu, Hirooka Toshihiko, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2010　(2)　400-400　2010/03/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

  80. B-10-82 Single-channel 400Gbit/s, OTDM-32 RZ/QAM coherent transmission over 225 km

    Kasai Keisuke, Omiya Tatsunori, Guan Pengyu, Yoshida Masato, Hirooka Toshihiko, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2010　(2)　420-420　2010/03/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

  81. B-10-83 10 Gsymbol/s, 128 QAM (140 Gbit/s) coherent optical transmission over 150km

    Okamoto Seiji, Omiya Tatsunori, Kasai Keisuke, Yoshida Masato, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2010　(2)　421-421　2010/03/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

  82. B-10-84 256 QAM (64 Gbit/s) coherent optical transmission over 160km

    Nakazawa Masataka, Okamoto Seiji, Omiya Tatsunori, Kasai Keisuke, Yoshida Masato

    Proceedings of the IEICE General Conference　2010　(2)　422-422　2010/03/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

  83. C-4-1 A 10GHz opto-electronic oscillator at 1.1μm using a single-mode VCSEL and a photonic crystal fiber

    Koizumi Kengo, Yoshida Masato, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2010　(1)　252-252　2010/03/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

  84. Challenging limitations of optical communication infrastructure

    M. Nakazawa

    New Breeze　22　(1)　3-4　2010/01

  85. B-10-36 320 Gbit/s/ch WDM Transmission over 525 km Using Time-domain Optical Fourier Transformation

    Guan Pengyu, Hirooka Toshihiko, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2009　(2)　216-216　2009/09/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

  86. B-10-40 Polarization and frequency division multiplexed 1 Gsymbol/s, 64 QAM coherent optical transmission with 8.6 bit/s/Hz spectral efficiency over 160 km

    Goto Hiroki, Omiya Tatsunori, Kasai Keisuke, Yoshida Masato, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2009　(2)　220-220　2009/09/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

  87. B-10-41 5 Gsymbol/s, 64 QAM-OFDM(30 Gbit/s) coherent optical transmission

    Omiya Tatsunori, Kasai Keisuke, Yoshida Masato, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2009　(2)　221-221　2009/09/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

  88. C-4-21 10 GHz-11.5 ps pulse generation form a gain-switched VCSEL at 1.1 μm

    Koizumi Kengo, Yoshida Masato, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2009　(1)　259-259　2009/09/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

  89. A 0.4GHz ultranarrow FBG optical filter with 30-dB side lobe suppression

    MORI Anne, KASAI Keisuke, YOSHIDA Masato, NAKAZAWA Masataka

    IEICE technical report　109　(179)　63-68　2009/08/20

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    A fiber Bragg grating (FBG) is an attractive optical filter device because of its narrow wavelength selectivity, low loss, compactness, and low cost. Therefore, it is useful for applications such as coherent optical communication systems, optical sensing and optical metrological standard. These applications require both a narrow bandwidth and a high side lobe suppression ratio. We have already demonstrated a 1.3GHz ultranarrow FBG filter with a side lobe suppression ratio of 13dB. In this paper, we report a 0.4GHz FBG filter with a side lobe suppression ratio as high as 30dB by combining a uniform FBG and a λ/4 shifted FBG.

  90. Oscillation characteristics of a 1.5μm FM-eliminated ^<13>C_2H_2 frequency-stabilized laser diode

    KASAI Keisuke, NAKAZAWA Masataka

    IEICE technical report　109　(174)　73-76　2009/08/13

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    We demonstrate the frequency stabilization of a 1.5μm laser diode (LD) with a low intensity noise and a narrow linewidth to a ^<13>C_2H_2 linear absorption line. The LD consists of an InP gain chip and an external Bragg reflector made of a PLC waveguide. By employing an external frequency modulator in a frequency stabilization circuit, an FM-eliminated optical output beam was obtained. The frequency stabilities reached as high as 2.3×10^<-11> for τ=1s and 9.1×10^<-12> for τ=100s. Furthermore, a RIN of less than -135dB/Hz, and a linewidth of 4kHz were simultaneously achieved.

  91. Passively mode-locked femtosecond fiber soliton laser with intersubband transition module

    SHOHDA Fumio, NAKAZAWA Masataka, AKIMOTO Ryoichi, ISHIKAWA Hiroshi

    IEICE technical report　109　(174)　93-96　2009/08/13

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    An intersubband transition (ISBT) in a quantum well has attracted considerable attention recently since it can be utilized to all-optical switching and signal processing. This is because the ISBT exhibits ultrahigh-speed saturable absorption characteristics faster than 1ps by injecting a TM (Transverse Magnetic) mode optical pulse with high intensity. In this paper, we realize a passively mode-locked fiber laser using the ISBT module as a saturable absorber for the first time. The laser cavity was optimized as a soliton laser, which enabled us to generate a stable soliton pulse. As a result, a 88fs, 42MHz soliton pulse was successfully generated.

  92. Cs optical atomic clock with a mode-hop-free fiber laser

    MORISAKI Takahito, YOSHIDA Masato, NAKAZAWA Masataka

    IEICE technical report　109　(174)　103-108　2009/08/13

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    Recently, delivery technique of standards through optical fiber networks has been receiving a lot of attention with respect to their application to frequency standard and measurement. As such optical signal source, we have developed a Cs optical atomic clock that uses a regeneratively mode-locked fiber laser (MLFL) as a microwave oscillator and an optically pumped Cs gas cell as a frequency standard. The Cs optical atomic clock can emit stable transform-limited picosecond pulses with a repetition rate of 9.1926GHz (Cs resonance). However, it was difficult to control the optical frequency of the optical output pulse from the Cs atomic clock because of the MLFL mode-hopping. In this work, we achieved mode-hop-free Cs optical atomic clock by inserting an etalon in the MLFL.

  93. Optical frequency-stabilized and 40GHz repetition-rate-stabilized, regeneratively mode-locked pulse laser

    YOSHIDA Masato, KASAI Keisuke, NAKAZAWA Masataka

    IEICE technical report　109　(174)　97-102　2009/08/13

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    Ultrastable mode-locked pulse lasers operating in the GHz region have been receiving a lot of attention with respect to their application to both ultrahigh-speed optical transmission, micro-photonics and optical metrology. In particular, control of the laser frequency is very important for optical coherent communication and optical metrology applications. In this paper, we have succeeded in the simultaneous stabilization of the optical frequency and repetition rate of a 40GHz regeneratively mode-locked picosecond erbium-doped fiber ring laser. The optical frequency was locked to the molecular absorption of C_2H_2 in the 1.5μm band and the repetition rate was stabilized to a 40GHz synthesizer by using a microwave phase-locked loop.

  94. 10GHz-11.5ps pulse generation from a gain-switched VCSEL at 1.1μm

    KOIZUMI Kengo, YOSHIDA Masato, NAKAZAWA Masataka

    IEICE technical report　109　(174)　89-92　2009/08/13

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    Vertical cavity surface emitting laser (VCSEL) is an attractive light source because of its low threshold, single longitudinal-mode operation, and high-speed modulation. In addition, the VCSEL is suitable for short pulse generation because of the short photon life time due to the very short cavity. Therefore, a high-speed picosecond pulse source can be realized with a simple configuration by using a gain-switched VCSEL. In this paper, we describe 10GHz pulse generation from gain-switched InGaAs VCSEL at 1.1μm. The shortest pulse pulse width of 11.5ps was obtained after chirp compensation.

  95. Cs optical atomic clock with a mode-hop-free fiber laser

    MORISAKI Takahito, YOSHIDA Masato, NAKAZAWA Masataka

    IEICE technical report　109　(173)　103-108　2009/08/13

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    Recently, delivery technique of standards through optical fiber networks has been receiving a lot of attention with respect to their application to frequency standard and measurement. As such optical signal source, we have developed a Cs optical atomic clock that uses a regeneratively mode-locked fiber laser (MLFL) as a microwave oscillator and an optically pumped Cs gas cell as a frequency standard. The Cs optical atomic clock can emit stable transform-limited picosecond pulses with a repetition rate of 9.1926GHz (Cs resonance). However, it was difficult to control the optical frequency of the optical output pulse from the Cs atomic clock because of the MLFL mode-hopping. In this work, we achieved mode-hop-free Cs optical atomic clock by inserting an etalon in the MLFL.

  96. Optical frequency-stabilized and 40GHz repetition-rate-stabilized, regeneratively mode-locked pulse laser

    YOSHIDA Masato, KASAI Keisuke, NAKAZAWA Masataka

    IEICE technical report　109　(173)　97-102　2009/08/13

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    Ultrastable mode-locked pulse lasers operating in the GHz region have been receiving a lot of attention with respect to their application to both ultrahigh-speed optical transmission, micro-photonics and optical metrology. In particular, control of the laser frequency is very important for optical coherent communication and optical metrology applications. In this paper, we have succeeded in the simultaneous stabilization of the optical frequency and repetition rate of a 40GHz regeneratively mode-locked picosecond erbium-doped fiber ring laser. The optical frequency was locked to the molecular absorption of C_2H_2 in the 1.5μm band and the repetition rate was stabilized to a 40GHz synthesizer by using a microwave phase-locked loop.

  97. 10GHz-11.5ps pulse generation from a gain-switched VCSEL at 1.1μm

    KOIZUMI Kengo, YOSHIDA Masato, NAKAZAWA Masataka

    IEICE technical report　109　(173)　89-92　2009/08/13

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    Vertical cavity surface emitting laser (VCSEL) is an attractive light source because of its low threshold, single longitudinal-mode operation, and high-speed modulation. In addition, the VCSEL is suitable for short pulse generation because of the short photon life time due to the very short cavity. Therefore, a high-speed picosecond pulse source can be realized with a simple configuration by using a gain-switched VCSEL. In this paper, we describe 10GHz pulse generation from gain-switched InGaAs VCSEL at 1.1μm. The shortest pulse pulse width of 11.5ps was obtained after chirp compensation.

  98. 10GHz-11.5ps pulse generation from a gain-switched VCSEL at 1.1μm

    KOIZUMI Kengo, YOSHIDA Masato, NAKAZAWA Masataka

    IEICE technical report　109　(175)　89-92　2009/08/13

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    Vertical cavity surface emitting laser (VCSEL) is an attractive light source because of its low threshold, single longitudinal-mode operation, and high-speed modulation. In addition, the VCSEL is suitable for short pulse generation because of the short photon life time due to the very short cavity. Therefore, a high-speed picosecond pulse source can be realized with a simple configuration by using a gain-switched VCSEL. In this paper, we describe 10GHz pulse generation from gain-switched InGaAs VCSEL at 1.1μm. The shortest pulse pulse width of 11.5ps was obtained after chirp compensation.

  99. Optical frequency-stabilized and 40GHz repetition-rate-stabilized, regeneratively mode-locked pulse laser

    YOSHIDA Masato, KASAI Keisuke, NAKAZAWA Masataka

    IEICE technical report　109　(175)　97-102　2009/08/13

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    Ultrastable mode-locked pulse lasers operating in the GHz region have been receiving a lot of attention with respect to their application to both ultrahigh-speed optical transmission, micro-photonics and optical metrology. In particular, control of the laser frequency is very important for optical coherent communication and optical metrology applications. In this paper, we have succeeded in the simultaneous stabilization of the optical frequency and repetition rate of a 40GHz regeneratively mode-locked picosecond erbium-doped fiber ring laser. The optical frequency was locked to the molecular absorption of C_2H_2 in the 1.5μm band and the repetition rate was stabilized to a 40GHz synthesizer by using a microwave phase-locked loop.

  100. Cs optical atomic clock with a mode-hop-free fiber laser

    MORISAKI Takahito, YOSHIDA Masato, NAKAZAWA Masataka

    IEICE technical report　109　(175)　103-108　2009/08/13

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    Recently, delivery technique of standards through optical fiber networks has been receiving a lot of attention with respect to their application to frequency standard and measurement. As such optical signal source, we have developed a Cs optical atomic clock that uses a regeneratively mode-locked fiber laser (MLFL) as a microwave oscillator and an optically pumped Cs gas cell as a frequency standard. The Cs optical atomic clock can emit stable transform-limited picosecond pulses with a repetition rate of 9.1926GHz (Cs resonance). However, it was difficult to control the optical frequency of the optical output pulse from the Cs atomic clock because of the MLFL mode-hopping. In this work, we achieved mode-hop-free Cs optical atomic clock by inserting an etalon in the MLFL.

  101. 10GHz-11.5ps pulse generation from a gain-switched VCSEL at 1.1μm

    KOIZUMI Kengo, YOSHIDA Masato, NAKAZAWA Masataka

    IEICE technical report　109　(176)　89-92　2009/08/13

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    Vertical cavity surface emitting laser (VCSEL) is an attractive light source because of its low threshold, single longitudinal-mode operation, and high-speed modulation. In addition, the VCSEL is suitable for short pulse generation because of the short photon life time due to the very short cavity. Therefore, a high-speed picosecond pulse source can be realized with a simple configuration by using a gain-switched VCSEL. In this paper, we describe 10GHz pulse generation from gain-switched InGaAs VCSEL at 1.1μm. The shortest pulse pulse width of 11.5ps was obtained after chirp compensation.

  102. Optical frequency-stabilized and 40GHz repetition-rate-stabilized, regeneratively mode-locked pulse laser

    YOSHIDA Masato, KASAI Keisuke, NAKAZAWA Masataka

    IEICE technical report　109　(176)　97-102　2009/08/13

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    Ultrastable mode-locked pulse lasers operating in the GHz region have been receiving a lot of attention with respect to their application to both ultrahigh-speed optical transmission, micro-photonics and optical metrology. In particular, control of the laser frequency is very important for optical coherent communication and optical metrology applications. In this paper, we have succeeded in the simultaneous stabilization of the optical frequency and repetition rate of a 40GHz regeneratively mode-locked picosecond erbium-doped fiber ring laser. The optical frequency was locked to the molecular absorption of C_2H_2 in the 1.5μm band and the repetition rate was stabilized to a 40GHz synthesizer by using a microwave phase-locked loop.

  103. Cs optical atomic clock with a mode-hop-free fiber laser

    MORISAKI Takahito, YOSHIDA Masato, NAKAZAWA Masataka

    IEICE technical report　109　(176)　103-108　2009/08/13

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    Recently, delivery technique of standards through optical fiber networks has been receiving a lot of attention with respect to their application to frequency standard and measurement. As such optical signal source, we have developed a Cs optical atomic clock that uses a regeneratively mode-locked fiber laser (MLFL) as a microwave oscillator and an optically pumped Cs gas cell as a frequency standard. The Cs optical atomic clock can emit stable transform-limited picosecond pulses with a repetition rate of 9.1926GHz (Cs resonance). However, it was difficult to control the optical frequency of the optical output pulse from the Cs atomic clock because of the MLFL mode-hopping. In this work, we achieved mode-hop-free Cs optical atomic clock by inserting an etalon in the MLFL.

  104. 64 QAM-OFDM coherent optical transmission

    OMIYA Tatsunori, GOTO Hiroki, KASAI Keisuke, YOSHIDA Masato, NAKAZAWA Masataka

    IEICE technical report　109　(31)　1-6　2009/05/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    Recently, Orthogonal Frequency Division Multiplexing (OFDM) system, that was originally developed in wireless communication, has been intensively studied in optical communication. The multi-carrier transmission of low-speed orthogonal subcarriers enables us to improve both spectral efficiency and dispersion tolerance by adopting high-level subcarrier modulation formats and employing coherent detection in OFDM. So far, 1 Tb/s per channel OFDM transmission and OFDM optical coherent transmission with 32 QAM subcarrier modulation have been reported. In this report, we realize, for the first time, QAM subcarrier modulation up to 64 levels using 128 subcarriers and demonstrate OFDM transmission over a 160km.

  105. 光通信インフラの限界に挑戦する

    中沢正隆

    ITUジャーナル　39　(5)　3-4　2009/05

  106. ペタビット/秒に向けた革新的伝送技術

    宮崎哲弥, 福地清, 中沢正隆

    ITUジャーナル　39　(5)　19-21　2009/05

  107. B-10-81 160 Gbit/s×8 channel-525 km WDM transmission using time-domain optical Fourier transformation

    Guan Pengyu, Okazaki Masatada, Hirano Toshiyuki, Hirooka Toshihiko, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2009　(2)　400-400　2009/03/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

  108. C-3-3 A 0.4 GHz ultranarrow FBG optical filter with 30-dB side lobe suppression

    Mori Anne, Kasai Keisuke, Yoshida Masato, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2009　(1)　154-154　2009/03/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

  109. B-10-50 1 Gsymbol/s, 6-channel frequency division multiplexed 64 QAM coherent optical transmission

    Goto Hiroki, Okamoto Seiji, Omiya Tatsunori, Kasai Keisuke, Yoshida Masato, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2009　(2)　369-369　2009/03/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

  110. B-10-49 12 Gbit/s, 64 QAM-OFDM coherent optical transmission

    Omiya Tatsunori, Goto Hiroki, Kasai Keisuke, Yoshida Masato, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2009　(2)　368-368　2009/03/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

  111. B-10-77 10 Gbit/s photonic crystal fiber transmission with a l.1μm directly-modulated VCSEL

    Koizumi Kengo, Hirooka Toshihiko, Yoshida Masato, Nakazawa Masataka

    Proceedings of the IEICE General Conference　396-396　2009

    Publisher: The Institute of Electronics, Information and Communication Engineers

  112. 次世代光通信基盤技術の展望

    中沢正隆, 廣岡俊彦

    ケミカルエンジニヤリング　54　(1)　51-57　2009/01

  113. BCI-1-10 Front line of ultra-multi-level modulation technique for coherent QAM transmission

    Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2008　(1)　"SS-41"-"SS-42"　2008/09/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

  114. B-10-67 Delivery of a Cs optical atomic clock by using JGN II optical networks

    Yoshida Masato, Kashiwamura Ikuro, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2008　(2)　210-210　2008/09/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

  115. A 1.3GHz ultranarrow FBG optical filter with 20-dB side lobe suppression

    MORI Anne, KASAI Keisuke, YOSHIDA Masato, NAKAZAWA Masataka

    IEICE technical report　108　(192)　103-108　2008/08/28

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    A fiber Bragg grating (FBG) is an attractive optical filter device because of its narrow wavelength selectivity, low loss, compactness, and low cost. Therefore, it is useful for applications such as dense wavelength division multiplexing and coherent optical communication systems. These applications require both a narrow bandwidth and a high side lobe suppression ratio. We have already demonstrated a 1.3GHz ultranarrow FBG filter with a side lobe suppression ratio of 13dB. In this paper, we report a 1.3GHz FBG filter with a side lobe suppression ratio as high as 20dB by combining a uniform FBG and a λ/4 shifted FBG.

  116. A 1.3GHz ultranarrow FBG optical filter with 20-dB side lobe suppression

    MORI Anne, KASAI Keisuke, YOSHIDA Masato, NAKAZAWA Masataka

    IEICE technical report　108　(193)　103-108　2008/08/28

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    A fiber Bragg grating (FBG) is an attractive optical filter device because of its narrow wavelength selectivity, low loss, compactness, and low cost. Therefore, it is useful for applications such as dense wavelength division multiplexing and coherent optical communication systems. These applications require both a narrow bandwidth and a high side lobe suppression ratio. We have already demonstrated a 1.3GHz ultranarrow FBG filter with a side lobe suppression ratio of 13dB. In this paper, we report a 1.3GHz FBG filter with a side lobe suppression ratio as high as 20dB by combining a uniform FBG and a λ/4 shifted FBG.

  117. A 1.3GHz ultranarrow FBG optical filter with 20-dB side lobe suppression

    MORI Anne, KASAI Keisuke, YOSHIDA Masato, NAKAZAWA Masataka

    IEICE technical report　108　(194)　103-108　2008/08/21

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    A fiber Bragg grating (FBG) is an attractive optical filter device because of its narrow wavelength selectivity, low loss, compactness, and low cost. Therefore, it is useful for applications such as dense wavelength division multiplexing and coherent optical communication systems. These applications require both a narrow bandwidth and a high side lobe suppression ratio. We have already demonstrated a 1.3GHz ultranarrow FBG filter with a side lobe suppression ratio of 13dB. In this paper, we report a 1.3GHz FBG filter with a side lobe suppression ratio as high as 20dB by combining a uniform FBG and a λ/4 shifted FBG.

  118. A 1.3GHz ultranarrow FBG optical filter with 20-dB side lobe suppression

    MORI Anne, KASAI Keisuke, YOSHIDA Masato, NAKAZAWA Masataka

    IEICE technical report　108　(191)　103-108　2008/08/21

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    A fiber Bragg grating (FBG) is an attractive optical filter device because of its narrow wavelength selectivity, low loss, compactness, and low cost. Therefore, it is useful for applications such as dense wavelength division multiplexing and coherent optical communication systems. These applications require both a narrow bandwidth and a high side lobe suppression ratio. We have already demonstrated a 1.3GHz ultranarrow FBG filter with a side lobe suppression ratio of 13dB. In this paper, we report a 1.3GHz FBG filter with a side lobe suppression ratio as high as 20dB by combining a uniform FBG and a λ/4 shifted FBG.

  119. Ultrahigh-speed and coherent optical transmission technologies

    M. Nakazawa

    New Breeze　20　(2)　16-19　2008/04

  120. BS-7-11 PMD tolerance of optical QAM

    Nakazawa Masataka

    Proceedings of the IEICE General Conference　2008　(2)　"S-102"-"S-103"　2008/03/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

  121. B-10-73 All-optical 40 GHz time-domain Fourier transformation using XPM with an optical parabolic pulse

    Hirooka Toshihiko, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2008　(2)　356-356　2008/03/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

  122. C-4-1 Polymer saturable absorber using poly carbonate with single-wall carbon nanotubes and its application to a femtosecond fiber soliton laser in 1.5μm band

    Shirato Takafumi, Shoda Fumio, Nakazawa Masataka, Komatsu Kyoji, Kaino Toshikuni

    Proceedings of the IEICE General Conference　2008　(1)　284-284　2008/03/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

  123. B-10-97 Polarization multiplexed 1 Gsymbol/s, 128 QAM coherent optical transmission

    Goto Hiroki, Kasai Keisuke, Yoshida Masato, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2008　(2)　380-380　2008/03/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

  124. Octave-spanning comb generation and optical frequency measurement using mode-locked fiber lasers

    Inaba Hajime, Nakajima Yoshiaki, Minoshima Kaoru, Hong Feng-Lei, Onae Atsushi, Nakazawa Masataka, Matsumoto Hirokazu

    The Review of Laser Engineering　36　(0)　26-27　2008

    Publisher: The Laser Society of Japan

  125. モード同期ファイバーレーザーと超高速光通信 (特集 最近の光周波数制御技術とその応用)

    中沢 正隆, 廣岡 俊彦

    光技術コンタクト　45　(11)　579-586　2007/11

    Publisher: 日本オプトメカトロニクス協会

    ISSN： 0913-7289

  126. CS-7-2 Optical transmission system with multi-level modulation/demodulation formats

    Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2007　(1)　"S-80"-"S-81"　2007/08/29

    Publisher: The Institute of Electronics, Information and Communication Engineers

  127. B-10-48 160 Gbit/s-1000 km Straight-line DPSK Transmission with Time-domain Optical Fourier Transmission

    Okazaki Masatada, Hirooka Toshihiko, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2007　(2)　242-242　2007/08/29

    Publisher: The Institute of Electronics, Information and Communication Engineers

  128. C-4-5 A regeneratively mode-locked fiber laser with a repetition rate stability of 4.9×10^<-15> using a hydrogen maser PLL

    Yoshida M., Hirayama T., Nakazawa M., Hagimoto K., Ikegami T.

    Proceedings of the Society Conference of IEICE　2007　(1)　211-211　2007/08/29

    Publisher: The Institute of Electronics, Information and Communication Engineers

  129. C-4-7 Aλ/4-shifted distributed feedback semiconductor fiber ring laser with a high OSNR and a narrow linewidth

    Ho Thi Quynh Anh, Suzuki Akihito, Yoshida Masato, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2007　(1)　213-213　2007/08/29

    Publisher: The Institute of Electronics, Information and Communication Engineers

  130. B-10-54 1Gsymbol/s, 64QAM coherent optical transmission with a high spectral efficiency using a Nyquist filter

    Kasai Keisuke, Hongo Jumpei, Goto Hiroki, Yoshida Masato, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2007　(2)　248-248　2007/08/29

    Publisher: The Institute of Electronics, Information and Communication Engineers

  131. カーボンナノチューブを可飽和吸収体として用いたソリトンファイバレーザ

    白土剛史, 廣岡俊彦, 吉田真人, 中沢正隆, 戒能俊邦, 小松京嗣

    電子情報通信学会大会講演論文集　2007　209　2007/08/29

    ISSN： 1349-1369

  132. カーボンナノチューブの発光・光学特性とその応用 CNTの超短パルスファイバレーザへの応用

    中沢正隆, 廣岡俊彦, 吉田真人, 戒能俊邦, 小松京嗣

    月刊Material Stage　7　(4)　37-40　2007/07/10

    ISSN： 1346-3926

  133. Photonic crystal fiber transmission with an 850nm VCSEL

    HIROOKA Toshihiko, HASEGAWA Hideaki, OIKAWA Yosuke, NAKAZAWA Masataka, SUZUKI Kenya, INOUE Yasuyuki

    IEICE technical report　107　(34)　1-6　2007/05/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    Recently, a photonic crystal fiber (PCF), which has a core region surrounded by multiple air holes, has received a lot of attention because of its new characteristics such as endlessly single-mode operation and arbitrary dispersion control. By combining PCF with inexpensive and high-speed optical devices such as VCSEL and Si-APD, we can construct low-cost and high-speed communication systems in the 800nm region such as 10-40 Gbit/s Ethernet. In this paper, we describe key technologies for 800nm high-speed transmission such as low-dispersion PCF and single-mode VCSEL. Then we describe the demonstration of a single-channel 10Gbit/s and 4×2.5Gbit/s WDM transmission with a directly modulated VCSEL. We also report a single-channel 40Gbit/s and 4×10Gbit/s WDM transmission through the PCF by employing an externally modulated VCSEL. These results indicate that simple, inexpensive and high-speed transmission over short distances such as LAN and FTTH appears to be feasible by combining these devices.

  134. B-10-44 40 Gb/s-2 km photonic crystal fiber transmission with an 850 nm single-mode VCSEL

    Hasegawa Hideaki, Oikawa Yosuke, Hirooka Toshihiko, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2007　(2)　383-383　2007/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  135. B-10-43 10 Gbit/s (4 x 2.5 Gbit/s) photonic crystal fiber transmission with direct modulation of 850 nm VCSELs

    Oikawa Yosuke, Hasegawa Hideaki, Hirooka Toshihiko, Nakazawa Masataka, Suzuki Kenya, Inoue Yasuyuki

    Proceedings of the IEICE General Conference　2007　(2)　382-382　2007/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  136. B-10-67 Effect of time-domain optical Fourier transformation on 160 Gbit/s DPSK transmission

    Hirooka Toshihiko, Osawa Kou, Okazaki Masatada, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2007　(2)　406-406　2007/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  137. C-4-23 Improvement of output characteristics of a ring-type polarization-maintaining λ/4 shifted distributed feedback fiber laser by using 0.98 μm pumping

    Ho Thi Quynh Anh, Suzuki Akihito, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2007　(1)　285-285　2007/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  138. C-4-25 Improvement of output characteristics of an optical frequency tunable 40GHz, picosecond mode-locked fiber laser

    Yoshida Masato, Kasai Keisuke, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2007　(1)　287-287　2007/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  139. C-4-29 Frequency stability improvement of mode-locked laser-type optical atomic clock with an optically pumped Cs gas cell

    Hirayama Toru, Yoshida Masato, Nakazawa Masataka, Hagimoto Ken, Ikegami Takeshi

    Proceedings of the IEICE General Conference　2007　(1)　291-291　2007/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  140. B-10-68 Performance of optical phase-locked loop over 500 km for coherent transmission using heterodyne detection

    Kasai Keisuke, Hongo Jumpei, Yoshida Masato, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2007　(2)　407-407　2007/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  141. BS-7-1 Coherent QAM transmission using a frequency-stabilized laser and an optical phase-locked-loop

    Yoshida Masato, Kasai Keisuke, Hongou Jumpei, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2007　(2)　"S-47"-"S-48"　2007/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  142. Can Humankind Handle the Phase of Optical Beam Like a Microwave?

    NAKAZAWA Masataka

    36　(2)　59-59　2007/02/10

    ISSN： 0389-6625

  143. B-10-24 A 10 Gb/s-2km photonic crystal fiber transmission with a 850nm directly modulated single-mode VCSEL

    Hasegawa Hideaki, Oikawa Yosuke, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2006　(2)　218-218　2006/09/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  144. B-10-23 40 Gbit/s (4×10 Gbit/s) over 5km photonic crystal fiber transmission using VCSELs and AWG at 850nm

    Oikawa Yosuke, Hasegawa Hideaki, Suzuki Kenya, Inoue Yasuyuki, Hirooka Toshihiko, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2006　(2)　217-217　2006/09/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  145. C-4-13 40GHz bright and dark parabolic optical pulse generation using a picosecond optical pulse source and a 64 channel AWG

    Hirooka Toshihiko, Osawa Kou, Nakazawa Masataka, Okamoto Katsunari

    Proceedings of the Society Conference of IEICE　2006　(1)　227-227　2006/09/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  146. C-4-6 Fabrication of a 1.3GHz ultranarrow band FBG optical filter

    Suzuki Akihito, Ho Thi Quynh Anh, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2006　(1)　220-220　2006/09/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  147. C-4-7 Performance improvement of an acetylene(C_2H_2) frequency-stabilized fiber laser using a highly-doped EDFA

    Kasai Keisuke, Suzuki Akihito, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2006　(1)　221-221　2006/09/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  148. B-10-64 Performance comparison of SMZ and EA type 40GHz optical DEMUX devices in 160Gbit/s OTDM transmission

    Osawa Kou, Kumakura Takashi, Hirooka Toshihiko, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2006　(2)　258-258　2006/09/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  149. B-10-54 64 and 128 coherent QAM preliminary transmission experiments using a frequency-stabilized laser and a local oscillator

    Nakazawa Masataka, Hongou Jumpei, Kasai Keisuke, Yoshida Masato

    Proceedings of the Society Conference of IEICE　2006　(2)　248-248　2006/09/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  150. C-4-16 An optical frequency tunable 40GHz, picosecond mode-locked fiber laser

    Yoshida Masato, Kasai Keisuke, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2006　(1)　230-230　2006/09/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  151. C-4-17 Proposal and its operation of mode-locked laser-type optical atomic clock with an optically pumped Cs gas-cell

    Hirayama Toru, Yoshida Masato, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2006　(1)　231-231　2006/09/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  152. Fabrication of an ultranarrow band fiber Bragg grating filter with a 1.3GHz bandwidth

    SUZUKI Akihito, TAKAHASHI Youhei, NAKAZAWA Masataka

    IEICE technical report　106　(211)　11-16　2006/08/17

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

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    Various applications of fiber Bragg gratings have been proposed, such as fiber-type narrow band filters or gain-flattening filters for EDFA. We have successfully fabricated an ultranarrow band FBG filter with a linewidth of 1.3GHz by using a 15cm-long polarization-maintaining fiber. In this paper, we describe the details of the fabrication of the FBG and its characteristics. The maximum reflectance and side lobe suppression of the FBG were 65% and 13dB, respectively.

  153. Comparison of optical demultiplexing using SMZ and EA modulator in 160Gbit/s-500km OTDM transmission

    HIROOKA Toshihiko, KUMAKURA Takashi, OSAWA Kou, NAKAZAWA Masataka

    IEICE technical report　106　(211)　33-38　2006/08/17

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

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    Optical time division multiplexing (OTDM) enables ultrahigh-speed transmission at a single wavelength with a bit rate beyond the limit of electrical signal processing. One of the key technologies for OTDM is an optical demultiplexer, which selects a low bit-rate signal from a high-speed OTDM data sequence at a receiver. In this paper, we compare two types of demultiplexers, one with a symmetric Mach-Zehnder (SMZ) switch and the other with an electro-absorption modulator (EAM), when used for 160Gbit/s (4×40Gbit/s) OTDM transmission over 500km. By combining the SMZ switch with a time-domain optical Fourier transmformation technique, we succeeded in obtaining slightly better bit-error rate (BER) performance than with the EAM.

  154. 40Gbit/s (4x10Gbit/s)-3km WDM transmission using 850nm VCSEL, AWG, and PCF

    OIKAWA Yosuke, HASEGAWA Hideaki, HIROOKA Toshihiko, YOSHIDA Masato, NAKAZAWA Masataka, SUZUKI Kenya, INOUE Yasuyuki

    IEICE technical report　106　(211)　27-32　2006/08/17

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

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    Recently, a photonic crystal fiber (PCF), which has a core region surrounded by multiple air holes, has received a lot of attention because of its new characteristics such as endlessly single-mode operation and arbitrary dispersion control. By combining a VCSEL, a Si-APD, and a PCF we can construct inexpensive and high-speed communication systems such as 10-40Gbit/s Ethernet. In this paper, we report the first 10Gbit/s x 4 channel WDM transmission over 3km at 850nm using a single-mode PCF without power penalty. We used a special arrayed waveguide grating (AWG) operating at 850nm as a multiplexer and a demultiplexer.

  155. Performance improvement of an acetylene (C_2H_2) frequency-stabilized fiber laser

    KASAI Keisuke, SUZUKI Akihito, YOSHIDA Masato, NAKAZAWA Masataka

    IEICE technical report　106　(211)　57-62　2006/08/17

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

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    An erbium-doped fiber with high Er-ion concentration generally causes output power fluctuation and self-pulsing operation in an erbium fiber laser due to relaxation oscillation. In this report, we employed a new EDF with high Er- and Al-ion concentrations in order to suppress relaxation oscillation and increase output power of the laser. As a result, the output power was more than doubled and the power fluctuation halved. Furthermore the frequency stability of the ^<13>C_2H_2 frequency-stabilized erbium fiber laser reached as high as 1.3×10^<-11> for τ=1s and 2.0×10^<-11> for τ=10^2s. The short term stability of τ=1s was also improved.

  156. Linewidth broadening in high-speed optical comb transmission using a picosecond mode-locked laser

    OSAWA Kou, HIROOKA Toshihiko, YOSHIDA Masato, NAKAZAWA Masataka

    IEICE technical report　106　(211)　63-68　2006/08/17

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

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    An optical pulse train generated from a mode-locked laser has neatly repetitive longitudinal modes in the frequency domain. Since the interval between adjacent modes is defined by the repetition frequency of the laser and each mode has a narrow linewidth with a high SN ratio, the modes can be used for highly accurate optical frequency measurement. Recently, the delivery of such optical frequency standards through optical fiber networks has become an important subject. When we transmit longitudinal modes through an optical fiber network, it is very important to investigate the deformation in the power spectrum of the modes that occurs during the transmission. In this paper, we report the spectrum deformation of the longitudinal mode that occurs during long-haul transmission through dispersion-shifted fiber. We used a 10GHz mode-locked fiber laser with a linewidth as narrow as 1kHz as the signal source. As a result, we found that the deformation of the longitudinal mode power spectrum occurs mainly at the tail of the spectrum and the linewidth broadening increases in proportion to the transmission distance. The main reason for the linewidth broadening in the present experiment was the phase fluctuation of the optical fiber caused by temperature fluctuation or vibration.

  157. B-10-68 160 Gbit/s-524km OTDM Transmission Using Time-domain Optical Fourier Transformation

    Hagiuda Ken-ichi, Kumakura Takashi, Osawa Kou, Hirooka Toshihiko, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2006　(2)　388-388　2006/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  158. B-10-81 10Gb/s-5km transmission at 850nm using a photonic crystal fiber, VCSEL, and Si-APD

    Hasegawa Hideaki, Oikawa Yosuke, Hirooka Toshihiko, Yoshida Masato, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2006　(2)　401-401　2006/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  159. C-4-2 The fabrication and oscillation characteristics of a polarization-maintained distributed feedback fiber laser at 1.55μm

    Suzuki Akihito, Takahashi Yohei, Yoshida Masato, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2006　(1)　246-246　2006/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  160. C-4-3 A ring-cavity λ/4-shift polarization-maintaining DFB fiber laser and the improvement of the oscillation characteristics

    Takahashi Yohei, Suzuki Akihito, Yoshida Masato, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2006　(1)　247-247　2006/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  161. C-4-4 Characteristics of a ^<13>C_2H_2 frequency-stabilized, polarization-maintained fiber laser at 1.54μm : Measurement of frequency stability with beat note signal

    Kasai Keisuke, Yoshida Masato, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2006　(1)　248-248　2006/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  162. C-4-5 A 1.5μm long cavity single-frequency fiber laser using SOA

    Ono Atsushi, Yoshida Masato, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2006　(1)　249-249　2006/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  163. C-14-7 Ultrastable Cs optical atomic clock with digital frequency stabilization using rectangular modulation

    Hirayama T., Yoshida M., Nakazawa M., Hagimoto K., Koga Y., Ikegami T.

    Proceedings of the IEICE General Conference　2006　(1)　274-274　2006/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  164. カーボンナノチューブをPMMA,PS中に含有した波長1.5μm帯可飽和吸収ポリマーの作製とフェムト秒レーザへの応用

    中沢正隆, 中原征二, 広岡俊彦, 吉田真人, 戒能俊邦, 小松京嗣

    電子情報通信学会大会講演論文集　2006　251　2006/03/08

    ISSN： 1349-1369

  165. 能動モード同期ファイバーレーザーの光通信分野への応用 (特集 光ファイバーレーザーの新展開)

    中沢 正隆

    O plus E　27　(11)　1280-1287　2005/11

    Publisher: 新技術コミュニケ-ションズ

    ISSN： 0911-5943

  166. B-10-72 ABCD matrix formalism for distortion-free transmission using time-domain optical Fourier transformation

    Nakazawa Masataka, Hirooka Toshihiko

    Proceedings of the Society Conference of IEICE　2005　(2)　290-290　2005/09/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  167. B-10-73 Derivation of analytical expression for third-order dispersion elimination using time-domain optical Fourier transformation

    Hirooka Toshihiko, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2005　(2)　291-291　2005/09/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  168. C-3-107 Fabrication of a zero-dispersion, dispersion-flattened photonic crystal fiber in the 800 nm region

    Hasegawa Hideaki, Oikawa Yosuke, Hirooka Toshihiko, Yoshida Masato, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2005　(1)　251-251　2005/09/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  169. C-4-13 A C_2H_2 frequency-stabilized fiber laser with a LiNbO_3 optical frequency modulator and a PLL circuit

    Kasai Keisuke, Yoshida Masato, Nakazawa Masataka, Shiota Kazunori, Masuda Shin

    Proceedings of the Society Conference of IEICE　2005　(1)　294-294　2005/09/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  170. B-10-69 Theoretical study on elimination of waveform distortion using time-domain optical Fourier transformation

    Nakazawa Masataka, Hirooka Toshihiko

    Proceedings of the IEICE General Conference　2005　(2)　359-359　2005/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  171. B-10-68 Proposal of ultrahigh-speed distortion-free transmission using all-optical time-domain Fourier transformation

    Hirooka Toshihiko, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2005　(2)　358-358　2005/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  172. B-10-43 Measurement of longitudinal-mode linewidth broadening in ultra-high speed optical pulse transmission

    Haneda Kentaro, Osawa Kou, Waiyapot Suttawassuntorn, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2005　(2)　333-333　2005/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  173. C-4-26 Measurement and investigation of longitudinal mode-hopping of GHz mode-locked fiber laser

    Harada Shinji, Kasai Keisuke, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2005　(1)　333-333　2005/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  174. C-3-76 Broadband dispersion measurement of a photonic crystal fiber with pico-second streak camera and SC light

    Hasegawa Hideaki, Oikawa Yousuke, Yoshida Masato, Hirooka Toshihiko, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2005　(1)　246-246　2005/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  175. C-4-25 An ultrastable PLL mode-locked fiber laser with hydrogen maser clock

    Yoshida M., Hirayama T., Yakabe M., Nakazawa M., Koga Y., Hagimoto K., Ikegami T.

    Proceedings of the IEICE General Conference　2005　(1)　332-332　2005/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  176. C-4-28 Construction of a ^<13>C_2H_2 (acetylene) frequency-stabilized, single-polarization fiber ring laser

    Kasai Keisuke, Yoshida Masato, Nakazawa Masataka, Shiota Kazunori, Masuda Shin

    Proceedings of the IEICE General Conference　2005　(1)　335-335　2005/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  177. Photonic crystal fibers and their applications

    NAKAZAWA Masataka

    73　(11)　1409-1417　2004/11/10

    Publisher: 応用物理学会

    ISSN： 0369-8009

  178. Effect of stimulated Brillouin scattering in generation of an ultrahigh-speed femtosecond pulse train using a dispersion-decreasing fiber

    HAGIUDA Ken-ichi, HIROOKA Toshihiko, NAKAZAWA Masataka

    326　13-18　2004/08/26

  179. Ultrahigh-speed parabolic pulse generation for time-domain optical Fourier transformation

    HIROOKA Toshihiko, NAKAZAWA Masataka

    326　117-122　2004/08/26

  180. Measurement of frequency stability of a Cs optical atomic clock using an opto-microwave oscillator

    YAKABE Masatsugu, NITO Ko, YOSHIDA Masato, NAKAZAWA Masataka, KOGA Yasuki, HAGIMOTO Ken, IKEGAMI Takeshi

    326　99-104　2004/08/26

  181. Oscillation characteristics of a 10GHz harmonically and regeneratively mode-locked SOA fiber laser

    ONO Atsushi, YOSHIDA Masato, NAKAZAWA Masataka

    326　105-110　2004/08/26

  182. Development of a C_2H_2 (acetylene) frequency-stabilized and single-polarization fiber laser

    KASAI Keisuke, YOSHIDA Masato, NAKAZAWA Masataka

    326　111-116　2004/08/26

  183. Measurement of frequency stability of a Cs optical atomic clock using an opto-microwave oscillator

    YAKABE Masatsugu, NITO Ko, YOSHIDA Masato, NAKAZAWA Masataka, KOGA Yasuki, HAGIMOTO Ken, IKEGAMI Takeshi

    Technical report of IEICE. OFT　104　(262)　19-24　2004/08/20

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

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    We demonstrate an ultrastable cesium (Cs) atomic clock with a 9.1926-GHz regeneratively mode-locked fiber laser. By adopting an optically pumped Cs beam tube that has a 1 m-long interaction cavity with a linewidth of 110 Hz, the frequency stabilities are reached as high as 4.8×10^<-12> for τ=1s and 6.3×10^<-13> for τ=50s.

  184. Oscillation characteristics of a 10GHz harmonically and regeneratively mode-locked SOA fiber laser

    ONO Atsushi, YOSHIDA Masato, NAKAZAWA Masataka

    Technical report of IEICE. OFT　104　(262)　25-30　2004/08/20

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

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    A harmonically and regeneratively mode-locked erbium-doped fiber laser can easily produce picosecond transform-limited pulses in the GHz region, so it is very attractive as a light source for an ultrafast optical communication. This fiber laser has a long cavity length and a high O-value of cavity, thus a narrow linewidth (less than 1kHz) of the longitudinal mode can be obtained. This laser is also utilized as a high pure microwave oscillator by using the longitudinal self-beat signal. In this report, we described a 10GHz mode-locked fiber laser using a semiconductor optical amplifier (SOA) instead of a conventional erbium-doped fiber (EDF) as a gain medium, which has a wide tunable range of the cavity length. We measured the linewidth of the laser as a function of the laser cavity.

  185. Development of a C_2H_2 (acetylene) frequency-stabilized and single-polarization fiber laser

    KASAI Keisuke, YOSHIDA Masato, NAKAZAWA Masataka

    Technical report of IEICE. OFT　104　(262)　31-36　2004/08/20

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

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    A frequency-stabilized fiber ring laser using linear absorption line of acetylene molecules is described. The output beam has no frequency modulation. A Fiber Brrag Grating (FBG) with a 3.7GHz bandwidth enabled single-frequency operation by selecting only one longitudinal-mode. The laser frequency was continuously tuned over 2GHz with a longitudinal-mode tracking technique using FBG and was locked to C_2H_2 molecules. The frequency stability (Allan variance) estimated from error signals reached as high as 1.7×10^<-10> for τ=1s and 1.7×10^<-11> for τ=1×10^2s.

  186. Measurement of frequency stability of a Cs optical atomic clock using an opto-microwave oscillator

    YAKABE Masatsugu, NITO Ko, YOSHIDA Masato, NAKAZAWA Masataka, KOGA Yasuki, HAGIMOTO Ken, IKEGAMI Takeshi

    Technical report of IEICE. OCS　104　(260)　19-24　2004/08/20

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    We demonstrate an ultrastable cesium (Cs) atomic clock with a 9.1926-GHz regeneratively mode-locked fiber laser. By adopting an optically pumped Cs beam tube that has a 1 m-long interaction cavity with a linewidth of 110 Hz, the frequency stabilities are reached as high as 4.8×10^<-12> for τ=1s and 6.3×10^<-13> for τ=50s.

  187. Oscillation characteristics of a 10GHz harmonically and regeneratively mode-locked SOA fiber laser

    ONO Atsushi, YOSHIDA Masato, NAKAZAWA Masataka

    Technical report of IEICE. OCS　104　(260)　25-30　2004/08/20

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    A harmonically and regeneratively mode-locked erbium-doped fiber laser can easily produce picosecond transform-limited pulses in the GHz region, so it is very attractive as a light source for an ultrafast optical communication. This fiber laser has a long cavity length and a high O-value of cavity, thus a narrow linewidth (less than 1kHz) of the longitudinal mode can be obtained. This laser is also utilized as a high pure microwave oscillator by using the longitudinal self-beat signal. In this report, we described a 10GHz mode-locked fiber laser using a semiconductor optical amplifier (SOA) instead of a conventional erbium-doped fiber (EDF) as a gain medium, which has a wide tunable range of the cavity length. We measured the linewidth of the laser as a function of the laser cavity.

  188. Development of a C_2H_2 (acetylene) frequency-stabilized and single-polarization fiber laser

    KASAI Keisuke, YOSHIDA Masato, NAKAZAWA Masataka

    Technical report of IEICE. OCS　104　(260)　31-36　2004/08/20

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    A frequency-stabilized fiber ring laser using linear absorption line of acetylene molecules is described. The output beam has no frequency modulation. A Fiber Brrag Grating (FBG) with a 3.7GHz bandwidth enabled single-frequency operation by selecting only one longitudinal-mode. The laser frequency was continuously tuned over 2GHz with a longitudinal-mode tracking technique using FBG and was locked to C_2H_2 molecules. The frequency stability (Allan variance) estimated from error signals reached as high as 1.7×10^<-10> for τ=1s and 1.7×10^<-11> for τ=1×10^2s.

  189. SC-13-6 Regeneratively Mode-locked Fiber Laser in the GHz Region as an Optical Microwave Oscillator

    Nakazawa Masataka

    Proceedings of the IEICE General Conference　2004　(1)　"S-92"-"S-93"　2004/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  190. B-10-118 Distortion-free transmission of ultrashort optical pulses using optical Fourier transformation

    Hirooka Toshihiko, Nakazawa Masataka, Futami Fumio, Watanabe Shigeki

    Proceedings of the IEICE General Conference　2004　(2)　489-489　2004/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  191. C-3-138 A method for optimizing dispersion characteristics of photonic crystal fibers

    Hasegawa Hideaki, Hirooka Toshihiko, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2004　(1)　312-312　2004/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  192. C-3-134 Recent Progress in Holey Fibers

    Nakazawa Masataka

    Proceedings of the IEICE General Conference　2004　(1)　308-308　2004/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  193. C-3-26 Optical filter characteristics of an ultra-narrow band polarization-maintaining fiber Bragg grating and its application to laser frequency tuning

    Yoshida Masato, Kasai Keisuke, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2004　(1)　199-199　2004/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  194. C-3-144 Splicing characteristics between a photonic crystal fiber and a conventional fiber

    Kikegawa Manabu, Hasegawa Hideaki, Yoshida Masato, Hirooka Toshihiko, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2004　(1)　318-318　2004/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  195. C-4-1 Stimulated Brillouin Scattering in DDF soliton compression of an ultrahigh-speed optical pulse train

    Ono Shimpei, Hirooka Toshihiko, Yoshida Masato, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2004　(1)　329-329　2004/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  196. C-4-19 Oscillation characteristics of a 40 GHz regeneratively mode-locked erbium-doped fiber laser

    Harada Shinji, Yoshida Masato, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2004　(1)　347-347　2004/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  197. Measurements of longitudinal mode linewidth and relative intensity noise in ultrahigh-speed mode-locked semiconductor lasers

    HANEDA Kentaro, YOSHIDA Masato, YOKOYAMA Hiroyuki, OGAWA Yo, NAKAZAWA Masataka

    Technical report of IEICE. OPE　103　(523)　49-52　2003/12/11

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

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    Recently, mode-locked laser diodes (MLLD's) have been intensively studied as light sources for ultrahigh-speed optical communication systems. To improve the timing-jitter and the frequency and amplitude stability of a high repetition rate pulse source, it is important to investigate the longitudinal mode linewidth and relative intensity noise. However, there has been no report on such measurements to date. In this paper we measure the longitudinal mode linewidth and relative intensity noise of 10 GHz and 40 GHz MLLDs and describe new results on these characteristics.

  198. Measurements of longitudinal mode linewidth and relative intensity noise in ultrahigh-speed mode-locked semiconductor lasers

    HANEDA Kentaro, YOSHIDA Masato, YOKOYAMA Hiroyuki, OGAWA Yo, NAKAZAWA Masataka

    Technical report of IEICE. LQE　103　(526)　49-52　2003/12/11

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    Recently, mode-locked laser diodes (MLLD's) have been intensively studied as light sources for ultrahigh-speed optical communication systems. To improve the timing-jitter and the frequency and amplitude stability of a high repetition rate pulse source, it is important to investigate the longitudinal mode linewidth and relative intensity noise. However, there has been no report on such measurements to date. In this paper we measure the longitudinal mode linewidth and relative intensity noise of 10 GHz and 40 GHz MLLDs and describe new results on these characteristics.

  199. Photonic Crystal Fibers and Their Application to Ultrashort Pulse Propagation

    NAKAZAWA Masataka

    32　(10)　606-612　2003/10/10

    ISSN： 0389-6625

  200. Measurements of Longitudinal Linewidths of 10 GHz, Picosecond Mode-locked Erbium-Doped Fiber Lasers Using a Heterodyne Detection Method

    CHOI Samuel, YOSHIDA Masato, NAKAZAWA Masataka

    The Transactions of the Institute of Electronics, Information and Communication Engineers C　86　(10)　1054-1062　2003/10/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 1345-2827

  201. FDTD Analysis of Fresnel Reflection at a Splice between a Photonic Crystal Fiber and a Conventional Fiber

    Hirooka Toshihiko, Hori Yusuke, Hasegawa Hideaki, Yoshida Masato, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2003　(1)　214-214　2003/09/10

    Publisher: The Institute of Electronics, Information and Communication Engineers

  202. C-4-24 モード同期半導体レーザの縦モード線幅およびその強度雑音の測定

    羽根田 健太郎, 吉田 真人, 横山 弘之, 小川 洋, 中沢 正隆

    電子情報通信学会ソサイエティ大会講演論文集　2003　(1)　300-300　2003/09/10

    Publisher: 一般社団法人電子情報通信学会

  203. Observation of Huge Fresnel Reflection at a Splicing Point between a Photonic Crystal Fiber and a Conventional Fiber and Its Suppression

    YOSHIDA Masato, KIKEGAWA Manabu, NISHIMURA Naoya, NAKAZAWA Masataka

    The Transactions of the Institute of Electronics, Information and Communication Engineers C　86　(9)　1007-1016　2003/09/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 1345-2827

  204. Observation of an optimum air-hole tapering for splicing between a conventional fiber and a photonic crystal fiber and the reduction of Fresnel reflection

    KIKEGAWA Manabu, HASEGAWA Hideaki, YOSHIDA Masato, HIROOKA Toshihiko, NAKAZAWA Masataka

    Technical report of IEICE. OCS　103　(255)　51-56　2003/08/21

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    We have already reported about an observation of a huge Fresnel reflection at a splicing point between a photonic crystal fiber (PCF) and a conventional fiber. This was caused by the difference of the refractive index in the claddings, which leads to a serious problem when utilizing PCF in optical communications. In this paper, the splicing characteristics between a PCF and a conventional fiber were measured in detail, and a splicing condition for suppressing the Fresnel reflection to below the Rayleigh scattering level was clarified. We also measured the cross-sectional structures of PCF near the splicing point by SEM, and a relation between reduction of the Fresnel reflection and air-hole form in the cladding of PCF was discussed.

  205. Observation of Ramsey fringe of a Cs resonance with an ultra-stable pure microwave generated by a regeneratively mode-locked fiber laser

    YAKABE Masatsugu, NITO Ko, YOSHIDA Masato, NAKAZAWA Masataka

    Technical report of IEICE. OCS　103　(255)　89-94　2003/08/21

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

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    A regeneratively mode-locked fiber laser can self-oscillate stably without a synthesizer. The laser has jitter less than 100 fs, so that a beat signal obtained between the longitudinal laser modes can be used as an ultra-stable pure microwave signal. By using this laser as an optical microwave oscillator, a new type of Cs optical atomic clock can be composed and have already been confirmed the operation. In this paper, we observed an atomic resonance of Cs (Ramsey fringe) at 9.1926 GHz for the first time with the optical microwave oscillator, and measured the fundamental characteristics of the Cs optical atomic resonance.

  206. Gaussian and Sech Approximation of a Mode Field in Photonic Crystal Fibers

    HIROOKA Toshihiko, HORI Yusuke, NAKAZAWA Masataka

    Technical report of IEICE. OFT　103　(257)　57-62　2003/08/14

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

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    Mode field distribution in the cladding region of photonic crystal fibers (PCF) depends strongly on the wavelength or the cladding structure. In this report, we formulate the least square approximation of the electrical field distribution of the fundamental mode (HEn mode) in PCF by a Gaussian and a hyperbolic-secant (sech) function. The analysis shows that the shape of the mode field varies with the ratio of a hole diameter d and a pitch A. The mode field is found to be approximated by a Gaussian function for large d/Λ values (i.e., for strongly guiding structure) as in step-index fibers, and by a sech function for small d/Λ values (for weakly guiding structure).

  207. Observation of an optimum air-hole tapering for splicing between a conventional fiber and a photonic crystal fiber and the reduction of Fresnel reflection

    KIKEGAWA Manabu, HASEGAWA Hideaki, YOSHIDA Masato, HIROOKA Toshihiko, NAKAZAWA Masataka

    Technical report of IEICE. OFT　103　(257)　51-56　2003/08/14

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    We have already reported about an observation of a huge Fresnel reflection at a splicing point between a photonic crystal fiber (PCF) and a conventional fiber. This was caused by the difference of the refractive index in the claddings, which leads to a serious problem when utilizing PCF in optical communications. In this paper, the splicing characteristics between a PCF and a conventional fiber were measured in detail, and a splicing condition for suppressing the Fresnel reflection to below the Rayleigh scattering level was clarified. We also measured the cross-sectional structures of PCF near the splicing point by SEM, and a relation between reduction of the Fresnel reflection and air-hole form in the cladding of PCF was discussed.

  208. Observation of Ramsey fringe of a Cs resonance with an ultra-stable pure microwave generated by a regeneratively mode-locked fiber laser

    YAKABE Masatsugu, NITO Ko, YOSHIDA Masato, NAKAZAWA Masataka

    Technical report of IEICE. OFT　103　(257)　89-94　2003/08/14

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    A regeneratively mode-locked fiber laser can self-oscillate stably without a synthesizer. The laser has jitter less than 100 fs, so that a beat signal obtained between the longitudinal laser modes can be used as an ultra-stable pure microwave signal. By using this laser as an optical microwave oscillator, a new type of Cs optical atomic clock can be composed and have already been confirmed the operation. In this paper, we observed an atomic resonance of Cs (Ramsey fringe) at 9.1926 GHz for the first time with the optical microwave oscillator, and measured the fundamental characteristics of the Cs optical atomic resonance.

  209. Trends in Femtosecond Technology Supporting Next Generation Industrial Bases

    NAKAZAWA Masataka

    The Journal of the Institute of Electronics, Information, and Communication Engineers　86　(8)　586-587　2003/08/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5693

  210. Ultrafast OTDM Transmission Technology

    NAKAZAWA Masataka

    The Journal of the Institute of Electronics, Information and Communication Engineers　86　(8)　588-593　2003/08/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5693

  211. High Precicion Frequency Standards Using Mode-Locked Fiber Lasers

    NAKAZAWA Masataka

    The Review of laser engineering　31　(7)　443-449　2003/07/15

    Publisher: レ-ザ-学会

    ISSN： 0387-0200

  212. Observation of huge Fresnel reflections at splicing points between a photonic crystal fiber and a conventional fiber and their suppression method

    Yoshida Masato, Kikegawa Manabu, Nakazawa Masataka

    Proceedings of the IEICE General Conference　2003　(1)　229-229　2003/03/03

    Publisher: The Institute of Electronics, Information and Communication Engineers

  213. Optical Amplifiers and Their Application to Fiber Lasers

    NAKAZAWA Masataka

    Japanese journal of optics　32　(2)　119-128　2003/02/10

    Publisher: 応用物理学会分科会日本光学会

    ISSN： 0389-6625

  214. Observation of huge Fresnel reflection at a splicing point between a photonic crystal fiber and a conventional fiber and its suppression

    YOSHIDA Masato, NISHIMURA Naoya, NAKAZAWA Masataka

    Technical report of IEICE. PS　102　(267)　1-6　2002/08/15

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    It is possible to realize index-guiding optical fibers by forming small air holes in the fiber cladding instead of doping its core with high-index materials. These fibers are called index-guiding type photonic crystal fibers. The fibers have very interesting new features including endlessly single-mode operation, zero GVD in the visible region, and easy control of the spot-size because of the strongly guiding characteristics that result from the very high relative refractive index between the core and cladding with air holes. In this study, we describe splicing characteristics between photonic crystal fibers and conventional fibers. A large Fresnel reflection is observed at the splicing point, which causes serious problems when utilizing photonic crystal fibers in conventional optical communications. A reduction method of the Fresnel reflection is also presented.

  215. Observation of huge Fresnel reflection at a splicing point between a photonic crystal fiber and a conventional fiber and its suppression

    YOSHIDA Masato, NISHIMURA Naoya, NAKAZAWA Masataka

    Technical report of IEICE. OFT　102　(269)　1-6　2002/08/15

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    It is possible to realize index-guiding optical fibers by forming small air holes in the fiber cladding instead of doping its core with high-index materials. These fibers are called index-guiding type photonic crystal fibers. The fibers have very interesting new features including endlessly single-mode operation, zero GVD in the visible region, and easy control of the spot-size because of the strongly guiding characteristics that result from the very high relative refractive index between the core and cladding with air holes. In this study, we describe splicing characteristics between photonic crystal fibers and conventional fibers. A large Fresnel reflection is observed at the splicing point, which causes serious problems when utilizing photonic crystal fibers in conventional optical communications. A reduction method of the Fresnel reflection is also presented.

  216. Observation of huge Fresnel reflection at a splicing point between a photonic crystal fiber and a conventional fiber and its suppression

    YOSHIDA Masato, NISHIMURA Naoya, NAKAZAWA Masataka

    Technical report of IEICE. OCS　102　(265)　1-6　2002/08/15

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    It is possible to realize index-guiding optical fibers by forming small air holes in the fiber cladding instead of doping its core with high-index materials. These fibers are called index-guiding type photonic crystal fibers. The fibers have very interesting new features including endlessly single-mode operation, zero GVD in the visible region, and easy control of the spot-size because of the strongly guiding characteristics that result from the very high relative refractive index between the core and cladding with air holes. In this study, we describe splicing characteristics between photonic crystal fibers and conventional fibers. A large Fresnel reflection is observed at the splicing point, which causes serious problems when utilizing photonic crystal fibers in conventional optical communications. A reduction method of the Fresnel reflection is also presented.

  217. Possibility of 500-1300nm Ultrahigh-speed Optical Communication Using Photonic Crystal Fibers

    NAKAZAWA Masataka

    Technical report of IEICE. OFT　101　(704)　1-12　2002/03/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    It is possible to realize index-guiding optical fibers by forming small air holes in the fiber cladding instead of doping its core with high-index materials. These fibers are called index-guiding type photonic crystal fibers. The fibers have very interesting new features including endlessly single-mode operation, zero GVD in the visible region, and easy control of the spot-size because of the strongly guiding characteristics that result from the very high relative refractive index between the core and cladding with air holes. We discuss the possibility of high-speed optical communication over 500 〜1300 nm.

  218. ANULTRASHORT PULSE SOURCE FOR HIGH-SPEED OPTICAL COMMUNICATION AND ITS COMPRESSION TECHNIQUE

    Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　2001　(1)　267-268　2001/08/29

    Publisher: The Institute of Electronics, Information and Communication Engineers

  219. A frequency-shifted feedback fiber laser and its application to optical measurements

    YOSHIDA M., NAKAZAWA M., ITO H.

    IEICE technical report. Component parts and materials　101　(258)　53-58　2001/08/17

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    In frequency-shifted feedback lasers (FSF lasers), a frequency shift is imposed on an intracavity light field by feedback of the first-order diffracted light of an acousto-optic modulator. In this report, we describe the performance of the FSF laser with an erbium-doped fiber as a gain medium and its application to measurements for group velocity dispersion and polarization mode dispersion of optical fibers. We also describe a new FSF laser which incorporates an active mode-locking technique. Because of the mode-locking mechanism, the phase between the modes are completely locked, and this indicates that one can greatly improve the signal to noise ratio of the beat signal (> 20 dB)in optical homodyne measurements.

  220. A frequency-shifted feedback fiber laser and its application to optical measurements

    YOSHIDA M., NAKAZAWA M., ITO H.

    IEICE technical report. EMD　101　(256)　53-58　2001/08/17

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    In frequency-shifted feedback lasers (FSF lasers), a frequency shift is imposed on an intracavity light field by feedback of the first-order diffracted light of an acousto-optic modulator. In this report, we describe the performance of the FSF laser with an erbium-doped fiber as a gain medium and its application to measurements for group velocity dispersion and polarization mode dispersion of optical fibers. We also describe a new FSF laser which incorporates an active mode-locking technique. Because of the mode-locking mechanism, the phase between the modes are completely locked, and this indicates that one can greatly improve the signal to noise ratio of the beat signal(>20 dB)in optical homodyne measurements.

  221. A frequency-shifted feedback fiber laser and its application to optical measurements

    YOSHIDA M., NAKAZAWA M., ITO H.

    Technical report of IEICE. OPE　101　(260)　53-58　2001/08/17

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    In frequency-shifted feedback lasers (FSF lasers), a frequency shift is imposed on an intracavity light field by feedback of the first-order diffracted light of an acousto-optic modulator. In this report, we describe the performance of the FSF laser with an erbium-doped fiber as a gain medium and its application to measurements for group velocity dispersion and polarization mode dispersion of optical fibers. We also describe a new FSF laser which incorporates an active mode-locking technique. Because of the mode-locking mechanism, the phase between the modes are completely locked, and this indicates that one can greatly improve the signal to noise ratio of the beat signal(>20 dB)in optical homodyne measurements.

  222. A frequency-shifted feedback fiber laser and its application to optical measurements

    YOSHIDA M., NAKAZAWA M., ITO H.

    Technical report of IEICE. LQE　101　(262)　53-58　2001/08/17

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    In frequency-shifted feedback lasers(FSF lasers), a frequency shift is imposed on an intracavity light field by feedback of the first-order diffracted light of an acousto-optic modulator. In this report, we describe the performance of the FSF laser with an erbium-doped fiber as a gain medium and its application to measurements for group velocity dispersion and polarization mode dispersion of optical fibers. We also describe a new FSF laser which incorporates an active mode-locking technique. Because of the mode-locking mechanism, the phase between the modes are completely locked, and this indicates that one can greatly improve the signal to noise ratio of the beat signal(>20 dB)in optical homodyne measurements.

  223. Proposal of an Optical Adaptive Equalizer Using a Nonlinearly Chirped Fiber Bragg Grating Pair

    INUI T., KOMUKAI T., NAKAZAWA M.

    Technical report of IEICE. OFT　101　(63)　7-12　2001/05/11

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

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    We describe an optical adaptive equalizer using a pair of nonlinearly chirped fiber Bragg gratings mounted on multilayer piezoelectric transducers (MLP). This equalizer can equalize second- and third- order dispersion of 80 km long dispersion-shifted fibers. The gratings were fabricated with phase masks that were multiply-overwritten with an electron beam. This technique reduced the group delay ripple to ± 1.90 ps. The operation region can be tuned up to 5.6 nm by applying 50 V to the MLP. These results indicate that this device is applicable to adaptive equalization.

  224. Causes of mode-hoppings in CW Erbium-doped fiber ring laser

    INABA Hajime, AKIMOTO Yoshiaki, KOMUKAI Tetsuro, NAKAZAWA Masataka

    Technical report of IEICE. OPE　100　(349)　13-17　2000/10/06

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

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    Erbium-doped fiber ring laser(EDFRL)has advantages of narrow-linewidth, low-noise, sufficient power, long-lifetime and alignment-free. However, it also has disadvantages of mode-competition and mode-hopping under mode-competition is suppressed. We suppressed the mode-competition instabilities by using an optical fiber Bragg grating(FBG)and operated the EDFRL without mode-hopping by using a Fabry-Perot filter. The causes and the countermeasures are considered from the experimental results. It is noted that the optimization of the parameters of a Fabry-Perot filter, a short resonator and the temperature control of FBG are important.

  225. Optical frequency domain reflectometry domain with a frequency-shifted feedback mode locked erbium doped fiber laser

    Yoshida M., Fujimoto M., Nakamura K., Nakazawa M., Ito H.

    Proceedings of the Society Conference of IEICE　2000　(2)　432-432　2000/09/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  226. Numerical Analyses of Ultrashort Fiber Laser with Optical Nonlinear Effect

    KUBOTA Hirokazu, NAKAZAWA Masataka

    Technical report of IEICE. OCS　100　(230)　61-66　2000/07/21

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

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    We performed numerical analyses of the transient waveform change and steady state waveforms ultrashort fiber laser incorporating self phase modulation effect. The relation ship of pulse width and fiber length, and the characteristics of dispersion-managed fiber laser are described.

  227. A Variable Dispersion Equalizer Using a Nonlinearly Chirped Fiber Bragg Grating Pair Mounted on Multi-Layer Piezoelectric Transducers

    INUI T., KOMUKAI T., NAKAZAWA M.

    Technical report of IEICE. OFT　100　(85)　19-23　2000/05/19

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    We describe a variable dispersion equalizer using a pair of nonlinearly chirped fiber Bragg gratings mounted on multi-layer piezoelectric transducers. This equalizer has a tunable dispersion range of ±15 ps/nm and enables us to equalize second- and third-order dispersion of dispersion-shifted fibers with different zero dispersion wavelengths over 6 nm. These results indicate that this equalizer is applicable to adaptive equalization as well as preset equalization.

  228. Optical fiber technology in current ultrahigh-speed optical TDM transmission

    NAKAZAWA Masataka

    Technical report of IEICE. OFT　100　(84)　7-15　2000/05/18

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

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    In this report, we describe recent advances in optical fiber technology which allowed us to achieve 640 Gbit/s OTDM transmission over 100 km. The fibers we used were dispersion-shifted fibers, dispersion-flattened fibers, dispersion-decreasing fibers, dispersion compensation fibers and reverse dispersion fibers. These were used for optical pulse compression and pulse energy stabilization using soliton effects, the construction of a wideband dispersion-flattened transmission line for femtosecond pulses, suppression of FWM with dispersion management, and optical switching using a NOLM. Finally, we emphasize how precisice control of dispersion along the direction of propagation is critical for achieving ultrahigh-speed optical transmission.

  229. A new optical routing technique using a time-to-wavelength mapped mode-locked laser(TWML)

    Tamura K.R., Komukai T., Nakazawa M.

    Proceedings of the IEICE General Conference　2000　(1)　378-378　2000/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  230. A Time-to-Wavelength Mapped Mode-locked Laser and Its Application to Wavelength Routing

    TAMURA K. R., KOMUKAI T., NAKAZAWA M.

    Technical report of IEICE. OFT　99　(538)　31-35　2000/01/14

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

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    Time-to-wavelength mapped lasers(TWML)are mode-locked sources which incorporate an element in the cavity that maps a unique transit delay to a given input wavelength. One way that such an element may be realized is to use a concatenation of fiber Bragg gratings. These lasers are tuned by varying the mode-locking frequency. Since the wavelength is fixed by intracavity filtering elements, it has the potential for high wavelength reproducibility and may fulfill the requirements needed for fast tunable lasers in wavelength-routed networks. We show how these lasers can be used to make a simple wavelength router where a subcarrier frequency serves as a routing address.

  231. Prototype of 10 GHz, 1ps PLL mode-locked fiber laser

    Yoshida Eiji, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　1999　(1)　237-237　1999/08/16

    Publisher: The Institute of Electronics, Information and Communication Engineers

  232. Controlling ASE noise for coherent WDM light source generated by soliton compression

    KUBOTA Hirokazu, TAMURA Kohichi R., NAKAZAWA Masataka

    Technical report of IEICE. OCS　99　(242)　53-56　1999/07/30

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

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    The coherence of a high order soliton pulse train and the corresponding super-continuum are greatly degraded due to the random evolution of the high order soliton in the presence of noise. This random evolution may be interpreted as the amplification of random ASE by the modulation instability gain of the high order soliton. We show that this random evolution can be suppressed by filtering an appropriate portion of the ASE spectrum.

  233. High repetition rate mode-locked fiber laser

    YOSHIDA Eiji, NAKAZAWA Masataka

    Technical report of IEICE. OCS　99　(242)　41-45　1999/07/30

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    A stable optical short pulse source with a high repetition rate is very important to realize future ultra-high speed optical communication systems. We report on the regenerative mode-locking of a fiber laser and show that this laser can emit a stable 1 ps pulse train at 10 GHz. In addition, we report a phase-locked-loop technique to lock the repetition-frequency of the laser to an external signal. The jitter characteristics of the output pulse are found to be extremely low.

  234. 10Gbit/s-3,000km Dispersion Managed Soliton Transmission Using Chirped Fiber Bragg Gratings

    YAMADA Eiichi, KOMUKAI Tetsuro, NAKAZAWA Masataka

    Technical report of IEICE. OCS　99　(242)　63-67　1999/07/30

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

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    We have succeeded in a 10 Gbit/s dispersion-managed soliton transmission over 3,000 km using 1.3 μm single-mode fibers and chirped fiber Bragg gratings (CFBG) at 1.55 μm. One repeater span was comprised of 52 km-long SMF, and the soliton pulses were dispersion-compensated by a CFBG after being amplified by an erbium-doped fiber amplifier (EDFA). The BER at 2,900 km was less than 1x10^<-9> and long-distance soliton transmission was achieved with this configuration. This CFBG technique is very advantageous for improving the performance of SMF transmission lines and this means we can construct high-speed network systems with installed SMF transmission lines at low cost.

  235. Wavelength-tunable 100-fs soliton generation using a dispersion-flattened DDF

    Tamura K., Nakazawa M.

    Proceedings of the IEICE General Conference　1999　(1)　362-362　1999/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  236. Timing jitter characteristics of a PLL, regeneratively mode-locked fiber laser at 10 GHz

    Yoshida Eiji, Nakazawa Masataka

    Proceedings of the IEICE General Conference　1999　(1)　361-361　1999/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  237. The Characteristics of a Single-Frequency Fiber Laser and its Application to Sensing

    INABA Hajime, AKIMOTO Yoshiaki, NAKAZAWA Masataka

    1999　(1)　19-23　1999/02/10

  238. Ultrashort pulse generation using a mode-locked fiber laser

    TAMURA K., YOSHIDA E., NAKAZAWA M.

    19　145-146　1999/01/01

    ISSN： 0913-6355

  239. Theoretical/Experimental Study of Gordon-Haus Jitter of Ultrashort Solitons Compressed in Dispersion Decreasing Fibers

    Tamura K., Nakazawa M.

    Proceedings of the Society Conference of IEICE　1998　(1)　327-327　1998/09/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  240. Forced Phase Modulation and Self Phase Modulation Effects in Dispersion-Tuned Mode-locked Fiber Lasers

    Tamura K., Yoshida E., Nakazawa M.

    Proceedings of the IEICE General Conference　1998　(1)　432-432　1998/03/06

    Publisher: The Institute of Electronics, Information and Communication Engineers

  241. Ultrahigh speed soliton control technologies and their applications

    NAKAZAWA Masataka

    Proceedings of the IEICE General Conference　1998　(1)　421-421　1998/03/06

    Publisher: The Institute of Electronics, Information and Communication Engineers

  242. Mode-Locked Fiber Lasers for Ultra-High Speed Optical Communications

    YOSHIDA E., TAMURA K., NAKAZAWA M.

    248　27-31　1998/02/06

  243. Characterization of a dispersion-tuned fiber laser

    Tamura K., Yoshida E., Nakazawa M.

    Proceedings of the Society Conference of IEICE　1997　(1)　259-259　1997/08/13

    Publisher: The Institute of Electronics, Information and Communication Engineers

  244. A 10 GHz, 2 ps harmonically and regeneratively FM mode-locked fiber laser

    Yoshida E., Tamura K., Nakazawa M.

    Proceedings of the IEICE General Conference　1997　(1)　383-383　1997/03/06

    Publisher: The Institute of Electronics, Information and Communication Engineers

  245. High Repetition Rate Dispersion-Tuned Fiber Laser Locked to External Clock

    Tamura K., Yoshida E., Nakazawa M.

    Proceedings of the IEICE General Conference　1997　(1)　382-382　1997/03/06

    Publisher: The Institute of Electronics, Information and Communication Engineers

  246. Femtosecond Fiber Lasers

    Nakazawa M.

    Proceedings of the IEICE General Conference　1997　(1)　515-516　1997/03/06

    Publisher: The Institute of Electronics, Information and Communication Engineers

  247. Optical Fiber Bragg Gratings.

    KOMUKAI Tetsuro, NAKAZAWA Masataka

    The Journal of the Institute of Electronics,Information and Communication Engineers　79　(12)　pp.1245-1247　1996/12/25

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5693

  248. Efficient four-wave mixing in an optical fiber with intensity dependent phase matching

    YAMAMOTO Takashi, NAKAZAWA Masataka

    Technical report of IEICE. OME　96　(284)　61-66　1996/10/03

    Publisher: The Institute of Electronics, Information and Communication Engineers

    More details Close

    The gain of wavelength conlversion via four-wave mixing in an optical fiber is investigated when using pump intensity-dependent phase matching. A fiber with a small mode-field diameter (4.2μm) and small dissension slope (0.0307 ps/km/nm^2) is used for the four-wave mixing. With the signal wavelength set to longer than the zero-dispersion wavelength of the fiber by 9.2 nm, a wavelength conversion gain of more than 5 dB is obtained over a plump wavelength range of more than 8 nm. When the pump wavelength is set to longer than the zero-dispersion wavelength by 1.2 nm, the conversion gain increases rapidly from -17.5 dB to +1.8 dB when the pump power is raised by only 3.0 dB (from 6.5 dBm to 9.5 dBm).

  249. A 750 fs, 10 GHz regeneratively mode-locked fiber laser in the 1.5μm region

    Yoshida E, Nakazawa M

    Proceedings of the Society Conference of IEICE　1996　(1)　384-385　1996/09/18

    Publisher: The Institute of Electronics, Information and Communication Engineers

  250. Generation of 10 GHz 16 Channel WDM Pulse Trains from a Femtosecond Fiber Laser

    Tamura K, Yoshida E, Nakazawa M

    Proceedings of the Society Conference of IEICE　1996　(1)　386-387　1996/09/18

    Publisher: The Institute of Electronics, Information and Communication Engineers

  251. 0.5 W average power, 10 GHz repetition rate femtosecond source in the 1.55μm region

    Tamura K., Yoshida E., Yamada E., Nakazawa M.

    Proceedings of the IEICE General Conference　1996　(1)　340-340　1996/03/11

    Publisher: The Institute of Electronics, Information and Communication Engineers

  252. Highly reflectiv fiber Bragg gratings formed on high NA dispersion-shifted fibers

    Komukai Tetsuro, Nakazawa Masataka

    Proceedings of the IEICE General Conference　1996　(2)　741-742　1996/03/11

    Publisher: The Institute of Electronics, Information and Communication Engineers

  253. Optical soliton transmission technology

    NAKAZAWA Masataka

    16　283-287　1996/01/01

    ISSN： 0913-6355

  254. Recent Progress in Optical Soliton Transmission

    NAKAZAWA Masataka

    Technical report of IEICE. OCS　95　(272)　43-50　1995/09/28

    Publisher: The Institute of Electronics, Information and Communication Engineers

    More details Close

    With a view to realizing Broadband ISDN, it is becoming more important to achieve ultrahigh-speed optical communication systems. One promising approach is the optical soliton communication, which does not change its waveform over long distances. In this paper, we report the recent progress in optical soliton communication including the field demonstration and discuss future prospects for optical soliton technologies.

  255. Nonlinear pulse transmission in an optical fiber with zero-average dispersion

    Kubota Hirokazu, Nakazawa Masataka

    Proceedings of the Society Conference of IEICE　1995　(1)　272-272　1995/09/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

  256. Generation of a femtosecond optical pulse train at 20 GHz

    Yoshida E., Kimura Y., Nakazawa M.

    Proceedings of the Society Conference of IEICE　1995　(1)　280-280　1995/09/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

  257. Fiber Lasers

    NAKAZAWA Masataka

    Appl. Phys. Lett.　24　(7)　398-399　1995/07/10

    ISSN： 0389-6625

  258. IN-LINE FIBER GRATING-TYPE OPTICAL BANDPASS FILTER TUNED BY APPLYING LATERAL STRESS (VOL 34, PG L306, 1995)

    T KOMUKAI, Y MIYAJIMA, M NAKAZAWA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS　34　(5B)　L648-L648　1995/05

    ISSN： 0021-4922

  259. Harmonically and regeneratively mode-locked erbium-doped

    Yoshida E., Kimura Y., Nakazawa M.

    Proceedings of the IEICE General Conference　1995　(1)　397-397　1995/03/27

    Publisher: The Institute of Electronics, Information and Communication Engineers

  260. 27p-G-1 Ultrafast Optical Soliton Communication

    Nakazawa Masataka

    1992　(4)　92-94　1992/09/14

    Publisher: The Physical Society of Japan (JPS)

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Books and Other Publications 18

  1. 光通信技術の飛躍的高度化－光通信の新たな挑戦－

    中沢正隆, 鈴木正敏, 盛岡敏夫

    2012/04

  2. 光科学研究の最前線2

    光科学研究の最前, 編集委員会

    JILS　2009/12

  3. フォトニクス基礎

    伊藤弘昌

    コロナ社　2009/11

  4. Ultrahigh-Speed Optical Transmission Technology

    H. G. Weber, M. Nakazawa

    Springer　2007/09

  5. 超高速ネットワーク技術(分担執筆)

    NAKAZAWA Masataka

    2000

  6. エルビウム添加光ファイバ増幅器(分担執筆)

    NAKAZAWA Masataka

    1999

  7. 光測定器ガイド(分担執筆)

    NAKAZAWA Masataka

    1998

  8. 応用物理ハンドブック(分担執筆)

    NAKAZAWA Masataka

    1998

  9. New Trends in Optical Soliton Transmission(Co-author)Systems Kluwer Academic Publishers

    NAKAZAWA Masataka

    1998

  10. 量子工学ハンドブック(分担執筆)

    NAKAZAWA Masataka

    1997

  11. 電子情報通信技術ハンドブック(分担執筆)

    NAKAZAWA Masataka

    1997

  12. 光情報通信ハンドブック(分担執筆)

    NAKAZAWA Masataka

    1996

  13. 固体レーザー日本分光学会測定法シリーズ(分担執筆)

    NAKAZAWA Masataka

    1993

  14. オプトエレクトロニクス用語辞典オーム社(分担執筆)

    NAKAZAWA Masataka

    1993

  15. 光増幅器とその光通信システムへの応用

    NAKAZAWA Masataka

    1992

  16. 超高速エレクトロニクス(分担執筆)

    NAKAZAWA Masataka

    1991

  17. 超高速光技術(分担執筆)

    NAKAZAWA Masataka

    1990

  18. レーザーハンドブック(分担執筆)

    NAKAZAWA Masataka

    1989

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Research Projects 10

  1. 多機能なコヒーレントナイキストパルスの提案とそれを用いた超高速・高効率光伝送技術

    中沢 正隆, 廣岡 俊彦, 吉田 真人, 葛西 恵介

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 特別推進研究

    Institution: 東北大学

    2014 - 2018

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    本年度はナイキストパルス伝送の高速・大容量化ならびに周波数利用効率(SE : Spectral Efficiency)向上への最終的な取り組みとして、(a)ノンコヒーレントナイキストパルスを用いた単一チャネル10Tbit/s伝送の実現、(b)波長多重ナイキストパルス伝送、ならびに(c)コヒーレントナイキストパルス伝送の単一チャネル15Tbit/sへの高速化・高SE化、の3つに取り組んだ。 (a)に関しては、2.56Tsymbol/sのシンボルレートで単一チャネル10.2Tbit/sの超高速伝送を2.5～3.7bit/s/HzのSEで実現した。10Tbit/sへの高速化にあたり、ノンコヒーレントナイキストパルスの340fsへの超短パルス化、4次分散まで考慮した高次分散補償、ならびに非線形ファイバループミラー(NOLM : Nonlinear Optical Loop Mirror)を用いたゲート幅230fsの超高速光多重分離を実現した。これらの技術を結集し、単一チャネル10.2Tbit/s信号の225km伝送(SE : 3.7bit/s/Hz)および300km伝送(SE : 2.5bit/s/Hz)を達成した。 次に(b)に関しては、ナイキストパルスの波長分割多重(WDM : Wavelength Division Multiplexing)への応用を目指して、1チャネルあたり1.28Tbit/sの超高速WDM伝送システムを構築した。この際、光通信用波長帯(Cバンド)で18Tbit/sのWDM信号を僅か14チャネルで生成することにより、1.28Tbits×14波WDM伝送を3.7bit/s/HzのSEで実現した。 (c)に関しては、最終目標であるコヒーレントナイキストパルスを用いた単一チャネル15.4Tbit/s、SE=8.3bit/s/Hzの超高速・高効率伝送に世界で初めて成功した。具体的には、コヒーレントパルスのシンボルレートを1.28Tsymbol/sまで高速化し、64QAM(Quadrature Amplitude Modulation)方式により単一チャネルで10Tbit/sを凌駕する究極的なコヒーレント超高速伝送を実現している。その際、ホモダイン検波回路における自己ビート成分の低減、および多重分離に関与しないトリビュータリを抑制するための光ゲート回路の導入により、ナイキストパルスの高OSNR化を図っている。これらの要素技術により、単一チャンネル15.4Tbit/s-150km超高速コヒーレントナイキストパルス伝送を8.3bit/s/Hzという極めて高いSEで達成した。 以上により、ナイキストパルスが高速性と高SE化の両面で極めて優れた伝送性能を有する究極的な光パルスであることを実証することに成功した。

  2. 光通信波長帯高精度レーザ歪みセンサの開発

    中沢 正隆

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 挑戦的萌芽研究

    Institution: 東北大学

    2013/04/01 - 2015/03/31

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    平成25年度は、光ファイバを用いた津波計測用センサを設計・試作した。従来技術であるファブリー・ペロー共振器の代わりに、ファイバリング共振器を利用した新たなセンサ構造を提案し、その1次試作を行なった。本課題で試作したセンサは、円筒構造（直径120 mm、高さ240 mm）のアルミ材に全長が4.5 mのファイバリング共振器を巻き付けるといった簡便かつ安価な構造を有する。そして、水圧変化に伴うセンサの直径方向の変化量をリング共振器の共振周波数より測定するものである。 つぎに試作したセンサと2台の周波数可変ファイバレーザを組み合わせることにより、レーザ津波計を作製し、水槽を利用した水位変化量の計測を実施した。2台のレーザを利用することにより温度変動に伴う測定誤差を50分の1に低減することに成功した。このような条件のもと、水槽の水位を約1 cmずつ変化させていった際に、12.2 MHz/cmというビート周波数の検出感度を得た。ビート信号の短期的なスペクトル揺らぎ（±110 kHz）から算出される水位変化量の測定誤差は90μmであり、世界最高水準の性能を実現することに成功した。 平成26年度は、平成25年度に試作した津波計測用センサの感度向上を目指し、圧力により形状変化が起こり易い凹凸構造を設けたセンサ部を新たに試作した。また、120度ずつ角度のずれた方向に歪み検出用センサ部を設けた三成分歪み計測用センサを試作した。しかし、平成26年度に新規に採択された特別推進研究課題との重複の制限により、試作したセンサの評価ならびに改良を課題として残した状況で本課題が終了することになった。本研究は大震災への対策技術として、地殻変動に伴う歪み量の高感度計測ならびに津波計測にとって大変重要である。今後も本研究を継続していく予定である。 研究発表：JAMSTEC連携協定協議会「高感度レーザ津波センサの試作」

  3. GHz mode-locked pulse laser with simultaneously stabilized optical frequency and repetition rate and its applications

    NAKAZAWA MASATAKA, YOSHIDA Masato

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (S)

    Institution: Tohoku University

    2009/05/11 - 2014/03/31

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    We have demonstrated for the first time a mode-locked pulse laser with simultaneo-usly stabilized optical frequency and repetition rate by using a Cs atomic resonance and an acetylene mol-ecular absorption line, respectively. We also successfully demonstrated a 440 fs short pulse generation byemploying a saturable absorber in the laser cavity for narrowing the pulse width. Furthermore,we applied apulse source based on a frequency stabilized CW laser to coherent optical pulse transmission, and we have successfully demonstrated for the first time a 1.92 Tbit/s single channel transmission with 64 QAM signal.

  4. カーボンナノチューブを用いたフェムト秒レーザおよび超高速光スイッチ素子の研究

    中沢 正隆

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(A)

    Institution: 東北大学

    2009 - 2009

  5. Establishment of novel ultrahigh-speed distortion-free optical transmission technology using time-domain optical Fourier transformation

    NAKAZAWA Masataka, HIROOKA Toshihiko, YOSHIDA Masato

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Specially Promoted Research

    Institution: Tohoku University

    2004 - 2008

  6. GHz帯高安定パルスレーザを用いた新たなCs光原子時計に関する研究

    中沢 正隆

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(A)

    Institution: 東北大学

    2004 - 2004

  7. Ultrashort mode-locked lasers and their applications to frequency standard and opto-microwave area Competitive

    2001/04 -

  8. Terabit/s OTDM transmission using a femtosecond pulse train Competitive

    2001/04 -

  9. Ultrahigh-speed optical soliton transmission and nonlinear optics in fibers Competitive

    2001/04 -

  10. GENERATION OF FEMTOSECOND OPTICAL PULSES BY COMPRESSION OF LINAC CERENKOV RADIATION PULSE

    KOBAYASHI Tetsuro, NAKAZAWA Masataka, KAMIYA Takeshi, OWAKI Shigehiro, CHO Yoshio, SHIMODA Koichi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Co-operative Research (A)

    Institution: OSAKA UNIVERSITY

    1990 - 1992

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    The purposes of this study are to improve the temporal and spatial coherence of Cerenkov Radiation (CR) and to develop new coherent light source such as Laser light, and to find out the generation method of ultimately short optical pulses applying ultrashort laser pulse techniques to broadband CR. First of all, possibility of femtosecond CR pulse generation by compensation of group velocity dispersion of CR dielectric was shown analytically and a femtosecond CR pulse generation system was designed with micro-bunching by a laser accelerator(1991, JPSJ). The near field of dipole radiation which is closely related to CR has been analyzed (by Shimoda). Two types of novel FIR generators using coherent CR were proposed. They employ laser/ photocathode electron sources and hollow dielectric Cerenkov radiators with high refractive index, one can generate a MW monocycle pulse and the other a tunable monochromatic light efficiently (by Kobayashi). Owaki, Sugihara, and Kimura studied 10-20ps white CR pulses and found one kind of coherent radiation in the mm-wavelength region. Kamiya proposed novel measurement method of white ultrashort pulses with compensation of the electron transit time and confirmed its function experimentally with photodetector-sequence. Cho invented time-resolvable nonlinear convolution spectrometer which is also useful for pulse measurement. Nakazawa studied various kinds of pulse compression methods applicable for CR pulses and propagation of CR pulse in velocity dispersion media and gain media.

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