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

• Project/Area Number: 26000009
• Research Category: Grant-in-Aid for Specially Promoted Research
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering; Engineering
• Research Institution: Tohoku University
• Principal Investigator: 中沢 正隆 東北大学, 電気通信研究機構, 特任教授 (80333889)
• Co-Investigator(Kenkyū-buntansha): 廣岡 俊彦 東北大学, 電気通信研究所, 准教授 (40344733) ; 吉田 真人 東北大学, 電気通信研究所, 准教授 (10333890) ; 葛西 恵介 東北大学, 電気通信研究所, 助教 (80534495)
• Project Period (FY): 2014 – 2018
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥567,580,000 (Direct Cost: ¥436,600,000、Indirect Cost: ¥130,980,000); Fiscal Year 2018: ¥88,920,000 (Direct Cost: ¥68,400,000、Indirect Cost: ¥20,520,000); Fiscal Year 2017: ¥91,390,000 (Direct Cost: ¥70,300,000、Indirect Cost: ¥21,090,000); Fiscal Year 2016: ¥113,880,000 (Direct Cost: ¥87,600,000、Indirect Cost: ¥26,280,000); Fiscal Year 2015: ¥145,080,000 (Direct Cost: ¥111,600,000、Indirect Cost: ¥33,480,000); Fiscal Year 2014: ¥128,310,000 (Direct Cost: ¥98,700,000、Indirect Cost: ¥29,610,000)
• Keywords: 高速光伝送 / ナイキストパルス / デジタルコヒーレント / 周波数利用効率 / 光時分割多重 / パルス整形 / 超短光パルス / QAM / ディジタルコヒーレント

Outline of Annual Research Achievements

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。

Assessment Rating

Verification Result (Rating)

A+

Research Products

• [Int'l Joint Research] McMaster大学(カナダ)
• [Int'l Joint Research] McMaster大学(カナダ)
• [Int'l Joint Research] MIT(米国)
• [Journal Article] 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 (2018)
  • Author(s): K. Kimura, J. Nitta, M. Yoshida, K. Kasai, T. Hirooka, and M. Nakazawa
  • Journal Title: Optics Express Volume: 26 Issue: 13 Pages: 17418-17428
  • DOI: 10.1364/oe.26.017418
  • Peer Reviewed / Open Access
• [Journal Article] Single-channel 10.2 Tbit/s (2.56 Tbaud) optical Nyquist pulse transmission over 300 km (2018)
  • Author(s): T. Hirooka, R. Hirata, J. Wang, M. Yoshida, and M. Nakazawa
  • Journal Title: Optics Express Volume: 26 Issue: 21 Pages: 27221-27236
  • DOI: 10.1364/oe.26.027221
  • Peer Reviewed / Open Access
• [Journal Article] 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 (2017)
  • Author(s): J. Nitta, M. Yoshida, K. Kimura, K. Kasai, T. Hirooka, and M. Nakazawa
  • Journal Title: Optics Express Volume: 25 Issue: 13 Pages: 15199-15207
  • DOI: 10.1364/oe.25.015199
  • Peer Reviewed / Open Access
• [Journal Article] Discrete solitons in optical fiber systems with large pre-dispersion (2017)
  • Author(s): S. Kumar and M. Nakazawa
  • Journal Title: Optics Express Volume: 25 Issue: 17 Pages: 19923-19945
  • DOI: 10.1364/oe.25.019923
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] 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 (2017)
  • Author(s): T. Kan, K. Kasai, M. Yoshida, and M. Nakazawa
  • Journal Title: Optics Express Volume: 25 Pages: 22726-22737
  • Peer Reviewed / Open Access
• [Journal Article] A 40 GHz, 770 fs regeneratively mode-locked erbium fiber laser operating at 1.6 µm (2017)
  • Author(s): K. Harako, M. Yoshida, T. Hirooka, and M. Nakazawa
  • Journal Title: IEICE Electronics Express Volume: 14 Issue: 19 Pages: 20170829-20170829
  • DOI: 10.1587/elex.14.20170829
  • NAID: 130006163803
  • ISSN: 1349-2543
  • Peer Reviewed
• [Journal Article] A Non-Perturbative Mode-Locking Theory of the Nyquist Laser With a Dirichlet Kernel Solution (2016)
  • Author(s): M. Nakazawa and T. Hirooka
  • Journal Title: IEEE Journal of Quantum Electronics Volume: 52 Issue: 8 Pages: 1-13
  • DOI: 10.1109/jqe.2016.2584585
  • Peer Reviewed
• [Journal Article] Roll-off factor dependence of Nyquist pulse transmission (2016)
  • Author(s): K. Harako, D. Suzuki, T. Hirooka, and M. Nakazawa
  • Journal Title: Optics Experss Volume: 24 Issue: 19 Pages: 21986-21994
  • DOI: 10.1364/oe.24.021986
  • Peer Reviewed / Open Access
• [Journal Article] 440 fs, 9.2 GHz regeneratively mode-locked erbium fiber laser with a combination of higher-order solitons and a SESAM saturable absorber (2016)
  • Author(s): T. Hirooka, K. Tokuhira, M. Yoshida, and M. Nakazawa
  • Journal Title: Optics Express Volume: 24 Issue: 21 Pages: 24255-24264
  • DOI: 10.1364/oe.24.024255
  • Peer Reviewed / Open Access
• [Journal Article] 1.55 μm hydrogen cyanide optical frequency-stabilized and 10 GHz repetition-rate-stabilized mode-locked fiber laser (2016)
  • Author(s): M. Yoshida, K. Yoshida, K. Kasai, and M. Nakazawa
  • Journal Title: Optics Express Volume: 24 Issue: 21 Pages: 24287-24296
  • DOI: 10.1364/oe.24.024287
  • Peer Reviewed / Open Access
• [Journal Article] Single-channel 5.12 Tbit/s (1.28 Tbaud) DQPSK transmission over 300 km using non-coherent Nyquist pulses (2016)
  • Author(s): D. Suzuki, K. Harako, T. Hirooka, and M. Nakazawa
  • Journal Title: Optics Express Volume: 24 Issue: 26 Pages: 29682-29690
  • DOI: 10.1364/oe.24.029682
  • Peer Reviewed / Open Access
• [Journal Article] Single-channel 1.92 Tbit/s, 64 QAM coherent Nyquist orthogonal TDM transmission with a spectral efficiency of 10.6 bit/s/Hz (2016)
  • Author(s): D. O. Otuya, K. Kasai, T. Hirooka, and M. Nakazawa
  • Journal Title: Journal of Lightwave Technology Volume: 34 Issue: 2 Pages: 768-775
  • DOI: 10.1109/jlt.2015.2468580
  • Peer Reviewed / Open Access
• [Journal Article] Mode locking theory of the Nyquist laser (2016)
  • Author(s): M. Nakazawa and T. Hirooka
  • Journal Title: Optics Express Volume: 24 Issue: 5 Pages: 4981-4995
  • DOI: 10.1364/oe.24.004981
  • Peer Reviewed / Open Access
• [Journal Article] Ultrafast Nyquist OTDM demultiplexing using optical Nyquist pulse sampling in an all-optical nonlinear switch (2015)
  • Author(s): T. Hirooka, D. Seya, K. Harako, D. Suzuki, and M. Nakazawa
  • Journal Title: Optics Express Volume: 23 Issue: 16 Pages: 20858-20866
  • DOI: 10.1364/oe.23.020858
  • Peer Reviewed / Open Access
• [Journal Article] 2.56 Tbit/s/ch (640 Gbaud) polarization-multiplexed DQPSK non-coherent Nyquist pulse transmission over 525 km (2015)
  • Author(s): K. Harako, D. Suzuki, T. Hirooka, and M. Nakazawa
  • Journal Title: Optics Express Volume: 23 Issue: 24 Pages: 30801-30806
  • DOI: 10.1364/oe.23.030801
  • NAID: 130005485784
  • Peer Reviewed / Open Access
• [Journal Article] Q-factor analysis of nonlinear impairments in ultrahigh-speed Nyquist pulse transmission (2015)
  • Author(s): T. Hirooka and M. Nakazawa
  • Journal Title: Optics Express Volume: 23 Issue: 26 Pages: 33484-33492
  • DOI: 10.1364/oe.23.033484
  • Peer Reviewed / Open Access
• [Journal Article] The Nyquist laser (2014)
  • Author(s): M. Nakazawa, M. Yoshida, and T. Hirooka
  • Journal Title: Optica Volume: 1 Issue: 1 Pages: 15-22
  • DOI: 10.1364/optica.1.000015
  • Peer Reviewed
• [Journal Article] 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 (2014)
  • Author(s): D.O. Otuya, K. Kasai, M. Yoshida, T. Hirooka, and M. Nakazawa
  • Journal Title: Optics Express Volume: 22 Issue: 20 Pages: 23776-23785
  • DOI: 10.1364/oe.22.023776
  • Peer Reviewed
• [Journal Article] High-performance TDM demultiplexing of coherent Nyquist pulses using time-domain orthogonality (2014)
  • Author(s): K. Harako, D.O. Otuya, K. Kasai, T. Hirooka, and M. Nakazawa
  • Journal Title: Optics Express Volume: 22 Issue: 24 Pages: 29456-29464
  • DOI: 10.1364/oe.22.029456
  • NAID: 110009959507
  • Peer Reviewed
• [Presentation] 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 (2018)
  • Author(s): K. Kimura, J. Nitta, M. Yoshida, K. Kasai, T. Hirooka, and M. Nakazawa
  • Organizer: Opto-Electronics and Communications Conference (OECC) 2018
  • Int'l Joint Research
• [Presentation] Single-channel 10.2 Tbit/s PDM-DQPSK Nyquist pulse transmission over 300 km (2018)
  • Author(s): T. Hirooka, R. Hirata, J. Wang, M. Yoshida, and M. Nakazawa
  • Organizer: European Conference on Optical Communication (ECOC) 2018
  • Int'l Joint Research
• [Presentation] 単一チャネル10.2 Tbit/s-300 km光ナイキストパルス伝送 (2018)
  • Author(s): 平田綾也・王 建平・廣岡俊彦・吉田真人・中沢正隆
  • Organizer: 電子情報通信学会2018年ソサイエティ大会
• [Presentation] 光ナイキストパルスを用いた単一チャネル10 Tbit/s級超高速伝送 (2018)
  • Author(s): 廣岡俊彦・吉田真人・中沢正隆
  • Organizer: 電子情報通信学会2018年ソサイエティ大会
  • Invited
• [Presentation] 単一チャネル10.2 Tbit/s-300 km光ナイキストパルス伝送 (2018)
  • Author(s): 平田綾也・王 建平・廣岡俊彦・吉田真人・中沢正隆
  • Organizer: 電子情報通信学会光ファイバ応用技術研究会
• [Presentation] 9.7 bit/s/Hzの周波数利用効率を有する単一チャネル7.68 Tbit/s-150 km, 64 QAMコヒーレントナイキストパルス伝送 (2018)
  • Author(s): 木村光佑・新田純平・吉田真人・葛西恵介・廣岡俊彦・中沢正隆
  • Organizer: 電子情報通信学会光ファイバ応用技術研究会
• [Presentation] EDFAとともに-光ソリトンからコヒーレントナイキストパルス伝送へ- (2018)
  • Author(s): 中沢正隆
  • Organizer: 電子情報通信学会第4回超高速光エレクトロニクス研究会
  • Invited
• [Presentation] 単一チャンネル7.68 Tbit/s-150 km, 64 QAMコヒーレントナイキストパルス伝送 (2018)
  • Author(s): 新田純平・木村光佑・吉田真人・葛西恵介・廣岡俊彦・中沢正隆
  • Organizer: 電子情報通信学会2018年総合大会
• [Presentation] Mode-locked lasers and their spectral manipulation for ultra-high speed pulse transmission (2017)
  • Author(s): M. Nakazawa
  • Organizer: Optical Fiber Communication Conference (OFC 2017)
  • Place of Presentation: Los Angeles, USA
  • Year and Date: 2017-03-20
  • Int'l Joint Research / Invited
• [Presentation] Subpicosecond Coherent Nyquist Pulse Generation for 1-Tbaud Transmission Using a C_2H_2 Frequency-Stabilized CW Laser and a 40 GHz Optical Comb Generator (2017)
  • Author(s): D. Suzuki, K. Kasai, T. Hirooka, and M. Nakazawa
  • Organizer: Conference on Lasers and Electro Optics (CLEO 2017)
  • Int'l Joint Research
• [Presentation] 40 GHz, 770 fs Harmonically and Regeneratively FM Mode-Locked Erbium Fiber Laser in L-Band (2017)
  • Author(s): K. Harako, M. Yoshida, T. Hirooka, and M. Nakazawa
  • Organizer: Conference on Lasers and Electro Optics (CLEO 2017)
  • Int'l Joint Research
• [Presentation] Progress on 3M Communication Systems (2017)
  • Author(s): M. Nakazawa
  • Organizer: International Symposium on Ultrafast Photonics Technology (ISUPT 2017)
  • Int'l Joint Research / Invited
• [Presentation] PMD issues in Nyquist transmission (2017)
  • Author(s): T. Hirooka
  • Organizer: International Symposium on Ultrafast Photoics Technology (ISUPT 2017)
  • Int'l Joint Research / Invited
• [Presentation] Invention of LD-pumped EDFA and their Applications from Soliton to Coherent Nyquist Pulse Transmission (2017)
  • Author(s): M. Nakazawa
  • Organizer: Pacific-Rim Conference on Lasers and Electro Optics (CLEO-PR 2017)
  • Int'l Joint Research / Invited
• [Presentation] Recent Progress on Ultra-High Capacity Optical Transmission using Multi-Level. Multi-Core, and Multi-Mode Techniques (2017)
  • Author(s): M. Nakazawa
  • Organizer: The 24th Congress of the International Commission for Optics (ICO-24)
  • Int'l Joint Research / Invited
• [Presentation] 単一チャネル3.84 Tbit/s, 64 QAMコヒーレントナイキストパルス信号の150 km伝送 (2017)
  • Author(s): 新田純平・木村光佑・吉田真人・葛西恵介・廣岡俊彦・中沢正隆
  • Organizer: 電子情報通信学会2017年ソサイエティ大会
• [Presentation] Recent progress in multi-level modulation (2017)
  • Author(s): M. Yoshida
  • Organizer: Special ECOC 2017 Symposium
  • Int'l Joint Research / Invited
• [Presentation] A New Optical Phase-Locked System Between Ultrashort Pulses for 640 Gbaud Nyquist OTDM Coherent QAM Transmission (2017)
  • Author(s): K. Kimura, J. Nitta, M. Yoshida, K. Kasai, T. Hirooka, and M. Nakazawa
  • Organizer: European Conference on Optical Communication (ECOC 2017)
  • Int'l Joint Research
• [Presentation] The EDFA odyssey from optical soliton to coherent Nyquist pulse (2017)
  • Author(s): M. Nakazawa
  • Organizer: International Symposium on Photonics and Optical Communication (ISPOC 2017)
  • Int'l Joint Research / Invited
• [Presentation] 10 Tbit/s/chに向けた超高速光ナイキストパルス伝送 (2016)
  • Author(s): 廣岡俊彦、吉田真人、葛西恵介、中沢正隆
  • Organizer: 第7回超高速フォトニクスシンポジウム
  • Place of Presentation: NICT(東京都小金井市)
  • Year and Date: 2016-12-07
  • Invited
• [Presentation] Single-channel 5.12 Tbit/s (1.28 Tbaud) DQPSK transmission over 300 km using non-coherent Nyquist pulses (2016)
  • Author(s): D. Suzuki, K. Harako, T. Hirooka, and M. Nakazawa
  • Organizer: European Conference on Optical Communication (ECOC 2016)
  • Place of Presentation: Dusseldorf, Germany
  • Year and Date: 2016-09-20
  • Int'l Joint Research
• [Presentation] Ultrahigh speed and high spectral efficiency transmission using optical Nyquist pulses (2016)
  • Author(s): M. Nakazawa
  • Organizer: Opto Electronics and Communications Conference (OECC 2016)
  • Place of Presentation: 朱鷺メッセ(新潟県新潟市)
  • Year and Date: 2016-07-03
  • Int'l Joint Research / Invited
• [Presentation] Roll-off factor dependence of system performance in 1.28 Tbit/s/ch-525 km Nyquist pulse transmission (2016)
  • Author(s): K. Harako, D. Suzuki, T. Hirooka, and M. Nakazawa
  • Organizer: Opto Electronics and Communications Conference (OECC 2016)
  • Place of Presentation: 朱鷺メッセ(新潟県新潟市)
  • Year and Date: 2016-07-03
  • Int'l Joint Research
• [Presentation] “Multi” is everywhere (2016)
  • Author(s): M. Nakazawa
  • Organizer: Conference on Lasers and Electro Optics (CLEO 2016) (Plenary Talk)
  • Place of Presentation: San Jose, USA
  • Year and Date: 2016-06-07
  • Int'l Joint Research / Invited
• [Presentation] A mode locking theory of the Nyquist laser (2016)
  • Author(s): M. Nakazawa and T. Hirooka
  • Organizer: Conference on Lasers and Electro Optics (CLEO 2016)
  • Place of Presentation: San Jose, USA
  • Year and Date: 2016-06-06
  • Int'l Joint Research
• [Presentation] A 440 fs, 9.2 GHz hybrid mode-locked erbium fiber laser with a combination of higher-order solitons and a SESAM saturable absorber (2016)
  • Author(s): T. Hirooka, K. Tokuhira, M. Yoshida, and M. Nakazawa
  • Organizer: Conference on Lasers and Electro Optics (CLEO 2016)
  • Place of Presentation: San Jose, USA
  • Year and Date: 2016-06-06
  • Int'l Joint Research
• [Presentation] A 0.95 ps, 10 GHz, 60 mW HCN frequency-stabilized and mode-locked fiber laser at 1.55 μm (2016)
  • Author(s): M. Yoshida, K. Yoshida, K. Kasai, and M. Nakazawa
  • Organizer: Conference on Lasers and Electro Optics (CLEO 2016)
  • Place of Presentation: San Jose, USA
  • Year and Date: 2016-06-06
  • Int'l Joint Research
• [Presentation] Qマップを用いた光ナイキストパルスの分散・非線形耐力の解析 (2016)
  • Author(s): 廣岡俊彦・中沢正隆
  • Organizer: 電子情報通信学会2016年総合大会
  • Place of Presentation: 九州大学(福岡県福岡市)
  • Year and Date: 2016-03-16
• [Presentation] 10テラビット/秒/チャネルデジタルコヒーレント光伝送への挑戦 (2016)
  • Author(s): 中沢正隆
  • Organizer: フォトニックネットワークシンポジウム
  • Place of Presentation: NICT(東京都小金井市)
  • Year and Date: 2016-02-26
  • Invited
• [Presentation] 超多値変調・多重化技術の最新動向 (2015)
  • Author(s): 廣岡俊彦
  • Organizer: 第29回光通信シンポジウム
  • Place of Presentation: 東レ総合研修センター(静岡県三島市)
  • Year and Date: 2015-12-18
  • Invited
• [Presentation] 光ナイキストパルスの発生と超高速・高効率伝送への応用 (2015)
  • Author(s): 廣岡俊彦, 吉田真人, 葛西恵介, 中沢正隆
  • Organizer: 電子情報通信学会第2回超高速光エレクトロニクス研究会
  • Place of Presentation: 東京農工大学(東京都小金井市)
  • Year and Date: 2015-11-25
  • Invited
• [Presentation] ノンコヒーレント光ナイキストパルスを用いた2.56 Tbit/s/ch-525 km DQPSK伝送 (2015)
  • Author(s): 原子広大・瀬谷大輝・鈴木大貴・廣岡俊彦・中沢正隆
  • Organizer: 電子情報通信学会2015年ソサイエティ大会
  • Place of Presentation: 東北大学(宮城県仙台市)
  • Year and Date: 2015-09-10
• [Presentation] 2.56 Tbit/s/ch (640 Gbaud) Polarization-Multiplexed DQPSK Non-Coherent Nyquist Pulse Transmission over 525km (2015)
  • Author(s): 原子広大・瀬谷大輝・鈴木大貴・廣岡俊彦・中沢正隆
  • Organizer: 平成27年度電気関係学会東北支部連合大会
  • Place of Presentation: 岩手県立大学(岩手県滝沢市)
  • Year and Date: 2015-08-27
• [Presentation] 10 GHz, 0.95 ps coherent optical pulse source based on 1.55 μm HCN frequency-stabilized mode-locked fiber laser (2015)
  • Author(s): 吉田一貴, 葛西恵介, 吉田真人, 中沢正隆
  • Organizer: 平成27年度電気関係学会東北支部連合大会
  • Place of Presentation: 岩手県立大学(岩手県滝沢市)
  • Year and Date: 2015-08-27
• [Presentation] 周波数利用効率10.6bit/s/Hzを有する1.92 Tbit/s/ch、64QAMコヒーレント直交時分割多重伝送 (2015)
  • Author(s): オツヤ ダビド オデケ・原子広大・葛西恵介・廣岡俊彦・中沢正隆
  • Organizer: 電子情報通信学会光通信システム研究会
  • Place of Presentation: 東京工業大学(東京都目黒区)
  • Year and Date: 2015-07-30
• [Presentation] Generation of optical Nyquist pulses and their applications to high speed/high spectral efficiency transmission (2015)
  • Author(s): T. Hirooka
  • Organizer: International Symposium on Ultrafast Photonics Technologies and Extremely Advanced Transmission (ISUPT/EXAT 2015)
  • Place of Presentation: コープイン京都(京都府京都市)
  • Year and Date: 2015-07-13
  • Int'l Joint Research / Invited
• [Presentation] HCN frequency-stabilized 10 GHz mode-locked fiber laser (2015)
  • Author(s): K. Yoshida, K. Kasai, M. Yoshida, and M. Nakazawa
  • Organizer: International Symposium on Ultrafast Photonics Technologies and Extremely Advanced Transmission (ISUPT/EXAT 2015)
  • Place of Presentation: コープイン京都(京都府京都市)
  • Year and Date: 2015-07-13
  • Int'l Joint Research
• [Presentation] 2.56 Tbit/s/ch polarization-multiplexed DQPSK non-coherent Nyquist pulse transmission over 525 km (2015)
  • Author(s): D. Suzuki, D. Seya, K. Harako, T. Hirooka, and M. Nakazawa
  • Organizer: International Symposium on Ultrafast Photonics Technologies and Extremely Advanced Transmission (ISUPT/EXAT 2015)
  • Place of Presentation: コープイン京都(京都府京都市)
  • Year and Date: 2015-07-13
  • Int'l Joint Research
• [Presentation] High-Speed, High Spectrally Efficient 64 QAM Orthogonal TDM Coherent Nyquist Pulse Transmission (2015)
  • Author(s): K. Kasai, D. O. Otuya, K. Harako, T. Hirooka and M. Nakazawa
  • Organizer: IEEE Summer Topicals 2015
  • Place of Presentation: Nassau, Bahamas
  • Year and Date: 2015-07-13
  • Int'l Joint Research / Invited
• [Presentation] Ultrafast Spectrally-Efficient TDM Multiplexing/Demultiplexing Schemes Using Orthogonality in Coherent Optical Nyquist Pulses (2015)
  • Author(s): M. Nakazawa
  • Organizer: Signal Processing in Photonic Communications (SPPCom 2015)
  • Place of Presentation: Boston, USA
  • Year and Date: 2015-06-29
  • Int'l Joint Research / Invited
• [Presentation] 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 (2015)
  • Author(s): D.O. Otuya, K. Harako, K. Kasai, T. Hirooka, and M. Nakazawa
  • Organizer: Optical Fiber Communication Conference (OFC 2015)
  • Place of Presentation: Los Angeles, USA
  • Year and Date: 2015-03-23
• [Presentation] 周波数利用効率10.6bit/s/Hzを有する1.92 Tbit/s/ch、64 QAMコヒーレントナイキストパルス伝送 (2015)
  • Author(s): David Odeke Otuya, 原子広大, 葛西恵介, 廣岡俊彦, 中沢正隆
  • Organizer: 電子情報通信学会2015年総合大会
  • Place of Presentation: 立命館大学(滋賀県草津市)
  • Year and Date: 2015-03-10
• [Presentation] Exabit optical communication infrastructure using 3M scheme (2014)
  • Author(s): M. Nakazawa
  • Organizer: Asia Communications and Photonics Conference (ACP2014)
  • Place of Presentation: Shanghai, China
  • Year and Date: 2014-11-12
  • Invited
• [Presentation] コヒーレント光ナイキストパルスを用いた直交時分割多重信号の超高速多重分離 (2014)
  • Author(s): 原子広大, David Odeke Otuya, 葛西恵介, 廣岡俊彦, 中沢正隆
  • Organizer: 電子情報通信学会光通信システム研究会
  • Place of Presentation: 長崎歴史文化博物館(長崎県長崎市)
  • Year and Date: 2014-10-30
• [Presentation] A single-channel 960 Gbit/s 64 QAM orthogonal TDM transmission with aspectral efficiency of 10.0 bit/s/Hz using coherent Nyquist pulses (2014)
  • Author(s): D.O. Otuya, K. Harako, K. Kasai, T. Hirooka, and M. Nakazawa
  • Organizer: European Conference on Optical Communication(ECOC2014)
  • Place of Presentation: Cannes, France
  • Year and Date: 2014-09-24
• [Presentation] Novel ultrafast TDM demultiplexing scheme using orthogonality in coherent Nyquist pulses (2014)
  • Author(s): K. Harako, D.O. Otuya, K. Kasai, T. Hirooka, and M. Nakazawa
  • Organizer: European Conference on Optical Communication (ECOC2014)
  • Place of Presentation: Cannes, France
  • Year and Date: 2014-09-23
• [Presentation] Novel TDM demultiplexing of 80 Gbaud, 64 QAM coherent Nyquist pulses using time-domain orthogonality (2014)
  • Author(s): 原子広大, David Odeke Otuya, 葛西恵介, 廣岡俊彦, 中沢正隆
  • Organizer: 平成26年度電気関係学会東北支部連合大会
  • Place of Presentation: 山形大学(山形県米沢市)
  • Year and Date: 2014-08-21
• [Presentation] Ultrahigh spectral efficiency systems-pushing the limits of multi-level modulation, multi-core fiber, and multi-mode control (2014)
  • Author(s): M. Nakazawa
  • Organizer: Opto-Electronics and Communications Conference(OECC 2014)
  • Place of Presentation: Melbourne, Australia
  • Year and Date: 2014-07-09
  • Invited
• [Presentation] Q margin comparison of RZ and Nyquist optical pulses in ultrahigh-speed TDM transmission (2014)
  • Author(s): T. Hirooka, L. Chen, and M. Nakazawa
  • Organizer: Opto-Electronics and Communications Conference(OECC 2014)
  • Place of Presentation: Melbourne, Australia
  • Year and Date: 2014-07-07
• [Remarks] 東北大学電気通信研究所中沢研究室ホームページ
  • URL: http://www.nakazawa.riec.tohoku.ac.jp
• [Remarks] 東北大学電気通信研究所中沢研究室ホームページ
  • URL: http://www.nakazawa.riec.tohoku.ac.jp/
• [Patent(Industrial Property Rights)] WDMコヒーレント伝送方式 (2019)
  • Inventor(s): 中沢正隆, 吉田真人, 廣岡俊彦
  • Industrial Property Rights Holder: 東北大学
  • Industrial Property Rights Type: 特許
  • Acquisition Date: 2019
• [Patent(Industrial Property Rights)] 光伝送方法および光伝送装置 (2017)
  • Inventor(s): 中沢正隆, 廣岡俊彦, 吉田真人, 葛西恵介
  • Industrial Property Rights Holder: 東北大学
  • Filing Date: 2017-10-23
  • Overseas
• [Patent(Industrial Property Rights)] 光伝送方法および光伝送装置 (2016)
  • Inventor(s): 中沢正隆、廣岡俊彦、吉田真人、葛西恵介
  • Industrial Property Rights Holder: 東北大学
  • Industrial Property Rights Type: 特許
  • Industrial Property Number: 2016-229408
  • Filing Date: 2016-11-25
• [Patent(Industrial Property Rights)] OTDM多重分離方法およびOTDM多重分離装置 (2016)
  • Inventor(s): 中沢正隆、廣岡俊彦、吉田真人、葛西恵介
  • Industrial Property Rights Holder: 東北大学
  • Industrial Property Rights Type: 特許
  • Filing Date: 2016-06-18
  • Acquisition Date: 2017-03-17
• [Patent(Industrial Property Rights)] ナイキストレーザ (2014)
  • Inventor(s): 中沢正隆、吉田真人、廣岡俊彦
  • Industrial Property Rights Holder: 国立大学法人東北大学
  • Industrial Property Number: 2014-092434
  • Filing Date: 2014-04-28
• [Patent(Industrial Property Rights)] ハイブリッドモード同期ソリトンレーザ (2014)
  • Inventor(s): 中沢正隆、吉田真人、廣岡俊彦
  • Industrial Property Rights Holder: 国立大学法人東北大学
  • Industrial Property Number: 2014-096620
  • Filing Date: 2014-05-08
• [Patent(Industrial Property Rights)] WDMコヒーレント伝送 (2014)
  • Inventor(s): 中沢正隆、吉田真人、廣岡俊彦
  • Industrial Property Rights Holder: 国立大学法人東北大学
  • Industrial Property Number: 2014-096621
  • Filing Date: 2014-05-08
• [Patent(Industrial Property Rights)] 光時分割多重信号の多重分離方法および装置 (2014)
  • Inventor(s): 中沢正隆、廣岡俊彦、吉田真人、葛西恵介
  • Industrial Property Rights Holder: 国立大学法人東北大学
  • Industrial Property Number: 2014-125008
  • Filing Date: 2014-06-18