[404] M. Nakazawa, M. Yoshida, and T. Hirooka, “Mode Division Multiplexed Coherent Optical Transmission in Time Domain by Using Higher-order Hermite-Gaussian Pulses,” OFC 2024, W2B.19, March (2024).

[405] M. Yoshida, T. Hirai, S. Beppu, K. Kasai, T. Hirooka, M. Nakazawa, Y. Wakayama, and N. Yoshikane, “New GAWBS Noise Interacting with Longitudinally Propagating Acoustic Waves in Few-mode Fibers,” OFC 2024, W2B.22, March (2024).

[400] K. Kasai, K. Shirahata, T. Sato, M. Yoshida, T. Hirooka, M. Nakazawa, T. Kobayashi, and U. Azuma, “Coherently-Linked Optical and Wireless Transmission with Microstrip Array Antenna at 28 GHz,” EXAT 2023, P-3.

[401] M. Yoshida, T. Hirai, K. Kasai, T. Hirooka, and M. Nakazawa, “GAWBS Noise in Few-mode Fiber,” EXAT 2023, P-5.

[402] M. Nakazawa, “Photonics for next generation radio access network (RAN),” 35th URSI General Assembly and Scientific Symposium (URSI GASS 2023), General Lecture 1.

[403] K. Shirahata, K. Kasai, T. Hirooka, M. Yoshida, M. Nakazawa, U. Azuma, and T. Kobayashi, “16 Gbit/s, 256 QAM optical and wireless fully coherent transmission at 28 GHz using small microstrip antenna,” ECOC 2023, Tu.B.4.1, October (2023).

[392] A. Watanabe, A. Ishikawa, M. Yoshida, T. Hirooka, M. Nakazawa, “10.2 Tbit/s (1.28 Tbit/s/ch x 8 ch) WDM Nyquist Pulse Transmission over 2100 km,” OECC 2022, M2B-3.

[393] M. Yoshida and M. Nakazawa, “GAWBS Noise in Multicore Fibers,” OECC 2022, invited talk, Tu2C-1.

[394] Y. Kobayashi, T. Suganuma, T. Hayashi, T. Hasegawa, M. Yoshida, and M. Nakazawa, “Characterization of Inter-core Crosstalk of Multi-core Fiber as a Function of Bending Radius with Multi-channel OTDR,” OECC 2022, Tu2C-2.

[395] M. Yoshida, K. Kimura, K. Kasai, T. Hirooka, and M. Nakazawa, “Demodulation Performance Comparison of 160 Gbaud Coherent Nyquist Pulse Signal with Analog and Digital DEMUX Schemes,” OECC 2022, TuP-B-6.

[396] Y. Kobayashi, T. Hayashi, T. Hasegawa, T. Suganuma, A. Inoue, T. Nagashima, H. Sakuma, T. Kikuchi, O. Shimakawa, H. Tazawa, M. Yoshida, and M. Nakazawa, “Distributed Measurement of Rayleigh Backscattered Crosstalk for Bidirectional Multicore Fiber Transmissions Using Multi-Channel Optical Time Domain Reflectometer,” ECOC 2022, Tu4A.3.

[397] M. Yoshida, T. Hirooka, M. Nakazawa, T. Hayashi, T. Hasegawa, K. Nakamura, and T. Inoue, “Measurement of Mode-Coupling Along a Multi-Core Submarine Fiber Cable With a Multi-Channel OTDR,” ECOC 2022, Tu4A.5.

[398] M. Nakazawa, “GAWBS Noise in Digital Coherent Transmission,” ECOC 2022, invited talk, We1C.1.

[399] K. Shirahata, T. Sato, K. Kasai, T. Hirooka, M. Yoshida, and M. Nakazawa, “48 Gbit/s 256 QAM coherently-linked optical and wireless transmission at 61 GHz band using a small planar antenna for 6G,” ICETC 2022, O4-3.

[383] M. Nakazawa, “Challenges in Realizing the Exabit Optical Communication Infrastructure using 3 “Multi” Technology,” 2020 IEEE Eighth International Conference on Communications and Electronics (ICCE 2020), Plenary talk, January (2021).

[384] K. Sato, M. Yoshida, K. Kasai, T. Hirooka, and M. Nakazawa, "GAWBS Noise Correlation Between Cores in Four-Core Fiber," OFC 2021, Tu6B.3, June (2021).

[385] K. Kasai, T. Sato, T. Hirooka, M. Yoshida, and M. Nakazawa, "64 Gbit/s, 256 QAM Transmission Through Coherent Optical-Wireless Link at 61 GHz Using Simple and High OSNR Carrier Frequency Converter," OFC 2021, Tu6E.2, June (2021).

[386] T. Kan, K. Kasai, M. Yoshida, T. Hirooka, and M. Nakazawa, "Broadband Dynamic Injection-Locking Performance of Fabry-Perot LD and Its Application to Coherent Homodyne Receiver," OFC 2021, F2A.5, June (2021).

[387] A. Watanabe, M. Yoshida, T. Hirooka, and M. Nakazawa, “Single-Channel 1.28 Tbit/s Optical Nyquist Pulse Transmission over 3000 km with Roll-off Factor Optimization,” OECC 2021, T4B.6.

[388] M. Naghshvarianjahromi, S. Kumar, J. Deen, T. Iwaya, K. Kimura, M. Yoshida, T. Hirooka, and M. Nakazawa, “Experimental demonstration of distortion mitigation in 15 Tbit/s OTDM transmission using a cognitive dynamic system,” OECC 2021, T4B.8.

[389] M. Yoshida, K. Sato, K. Kasai, T. Hirooka, and M. Nakazawa, “GAWBS phase noise correlation between cores in 19-core fiber,” EXAT 2021, P-11.

[390] A. Watanabe, M. Yoshida, T. Hirooka, and M. Nakazawa, “Optimization of roll-off factor in ultrahigh-speed WDM Nyquist pulse transmission,” ICETC 2021, B1-2.

[391] K. Kasai, T. Sato, K. Shirahata, T. Hirooka, M. Yoshida, M. Nakazawa, “Performance comparison between injection-locked carrier frequency conversion and self-heterodyne detection methods in coherently-linked optical and wireless transmission for 6G,” ICETC 2021, B1-3.

[369] N. Takefushi, M. Yoshida, T. Hirooka, K. Kasai, and M. Nakazawa, “Experimental and Theoretical Analyses of GAWBS Phase Noise in Multi-core Fiber for Digital Coherent Transmission,” OFC 2020, T4J.3, March (2020).

[370] M. Yoshida, T. Kan, K. Kasai, T. Hirooka, and M. Nakazawa, “10 Tbit/s QAM Quantum Noise Stream Cipher Coherent Transmission over 160 km,” OFC 2020, T3D.2, March (2020).

[371] K. Kasai and M. Nakazawa, “10 GHz, 6.2 ps Transform-limited Coherent Optical Pulse Generation from a 1.55 μm, Self-injection Gain-switched DFB-LD,” OFC 2020, Th2A.14, March (2020).

[372] T. Murakami, Y. Kishi, K. Ishibashi, K. Kasai, H. Shinbo, M. Tamai, K. Tsuda, M. Nakazawa, Y. Tsukamoto, H. Yokoyama, Y. Fujii, Y. Seki, S. Nanba, and T. Hara, F. Adachi, and T. Sotoyama, “Research Project to Realize Various High-reliability Communications in Advanced 5G Network,” 2020 IEEE Wireless Communications and Networking Conference (WCNC), 19710689, May (2020).

[373] K. Kasai, M. Nakazawa, M. Yoshida, K. Iwatsuki, and T. Hirooka, “Digital Coherent Optical Access Technologies for Beyond 5G Network,” Invited talk, 2020 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT), TH4A.2, September (2020).

[374] M. Nakazawa, “Odyssey on Ultrahigh-Speed Optical Communication Over 30 Years,” OECC 2020, plenary talk, October (2020).

[375] M. Nakazawa, “Advanced Fiber Laser Technology for Achieving Extremes of Ultrahigh-speed Optical Communication,” OECC 2020, invited talk, Special Symposium: The 60th Laser Anniversary Symposium, October (2020).

[376] K. Sato, T. Kan, M. Yoshida, K. Kasai, T. Hirooka, and M. Nakazawa, “Chromatic Dispersion Dependence of GAWBS Noise,” OECC 2020, T2-1.2, October (2020).

[377] T. Iwaya, K. Kimura, M. Yoshida, K. Kasai, T. Hirooka, and M. Nakazawa, “Low-Nonlinearity, Dispersion-Compensated Transmission Line with a Chirped Fiber Bragg Grating and Its Application to Ultrahigh-Speed Coherent Nyquist Pulse Transmission,” OECC 2020, T2-2.4, October (2020).

[378] T. Kan, K. Sato, M. Yoshida, K. Kasai, T. Hirooka, and M. Nakazawa, “Precise and Wideband Compensation of Inter-Channel Cross-Phase Modulation Noise in WDM Coherent Transmission Using Injection Locking,” OECC 2020, T2-3.4, October (2020).

[379] A. Watanabe, T. Hirooka, M. Yoshida, and M. Nakazawa, “12.8 Tbit/s (10 ch, 1.28 Tbit/s) OTDM-WDM Transmission of 320 Gbaud PDM-DQPSK Optical Nyquist Pulses over 1500 km,” OECC 2020, T2-5.4, October (2020).

[380] M. Yoshida, K. Sato, T. Hirooka, K. Kasai, and M. Nakazawa, “Precise measurements and their analysis of GAWBS-induced depolarization noise in multi-core fiber for digital coherent transmission,” ICETC 2020, C2-3, December (2020).

[381] K. Kimura, T. Iwaya, M. Yoshida, K. Kasai, T. Hirooka, and M. Nakazawa, “BER performance improvement of ultrahigh-speed coherent Nyquist pulse transmission using low-nonlinearity, dispersioncompensated transmission line with chirped FBG and LCoS,” ICETC 2020, C2-4, December (2020).

[382] K. Kasai, T. Hirooka, M. Yoshida, and M. Nakazawa, “64 Gbit/s, 256 QAM coherently-linked optical and wireless transmission in 61 GHz band using novel injection-locked carrier frequency converter,” ECOC 2020, Th1G-7, Dec. (2020).

[360] M. Yoshida, K. Kasai, T. Hirooka, and M. Nakazawa, “Dual-polarization on-line 256 and 512 QAM digital coherent transmission,” OFC 2019, M2H.4, March (2019).

[361] M. Minowa, H. Seki, Y. Okumura, S. Suyama, J. Terada, S. Shigematsu, Y. Takatori, H. Asano, Y. Hirano, Y. Yamao, F. Adachi, and M. Nakazawa, “5G R&D Activities for High Capacity Technologies with Ultra High-Density Multi-Band and Multi-Access Layered Cells,” 2019 IEEE 89th Vehicular Technology Conference (VTC2019-Spring), 18792792, April (2019).

[362] M. Nakazawa, “Recent progress on advanced QAM transmission and its application to quantum stream cipher and mobile fronthaul,” ISUPT 2019 (invited talk), MI2, June (2019).

[363] M. Yoshida, T. Kan, K. Kasai, T. Hirooka, and M. Nakazawa, “Real-Time 256 QAM Bi-directional Coherent Transmission in Next Generation Mobile Fronthaul,” OECC 2019, TuA2-3, July (2019).

[364] N. Takefushi, M. Yoshida, K. Kasai, T. Hirooka, and M. Nakazawa, “GAWBS Noise Characteristics in Digital Coherent Transmission in Various Optical Fibers,” OECC 2019, Th2C-5, July (2019).

[365] R. Hirata, T. Hirooka, M. Yoshida, and M. Nakazawa, “Sub-Picosecond Optical Switch over Entire C-band by Using Nonlinear Optical Loop Mirror,” OECC 2019, ThC1-5, July (2019).

[366] T. Kan, M. Yoshida, K. Kasai, T. Hirooka, K. Iwatsuki, and M. Nakazawa, “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,” ECOC 2019, M.1.C.4, September (2019).

[367] N. Takefushi, M. Yoshida, T. Hirooka, K. Kasai, and M. Nakazawa, “Experimental and theoretical analyses of GAWBS depolarization noise in digital coherent transmission,” ECOC 2019, Tu.1.C.1, September (2019).

[368] A. Araya, K. Kasai, M. Yoshida, M. Nakazawa, and T. Tsubokawa, “Evaluation of Systematic Errors of the Compact Absolute Gravimeter TAG-1 for Network-Monitoring of Volcanic Activities,” 5th IAG Symposium on Terrestrial Gravimetry: Static and Mobile Measurements (TG-SMM 2019), Saint Petersburg, Russia Plenary papers, October (2019).

[348] M. Nakazawa, M. Terayama, S. Okamoto, M. Yoshida, K. Kasai, and T. Hirooka, “Observation of Guided Acoustic-Wave Brillouin Scattering and its Digital Compensation in Coherent QAM Transmission,” OFC 2018, M4B.2, March (2018).

[349] K. Kasai, M. Yoshida, T. Hirooka, and M. Nakazawa, “Injection-locked Homodyne Detection for Higher-order QAM Transmission,” OFC 2018, Invited talk, M4G.1, March (2018).

[350] S. Okamoto, M. Terayama, M. Yoshida, K. Kasai, T. Hirooka, and M. Nakazawa, “Experimental and Numerical Comparison of Probabilistically-Shaped 4096 QAM and Uniformly-Shaped 1024 QAM in All-Raman Amplified 160 km Transmission,” OFC 2018, M3C.5, March (2018).

[351] M. Terayama, S. Okamoto, K. Kasai, M. Yoshida, and M. Nakazawa, “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,” OFC 2018, Th1F.2, March (2018).

[352] M. Nakazawa, M. Yoshida, and T. Hirano, “Secure Transmission using QAM Quantum Noise Stream Cipher with Continuous Variable QKD,” OFC 2018, Invited talk, Th3E.2 March (2018).

[353] M. Yoshida, N. Takefushi, M. Terayama, K. Kasai, T. Hirooka, and M. Nakazawa, "Reverse Phase Modulation Technique for GAWBS Noise Error Floor Elimination in 1024 QAM-160 km Digital Coherent Transmission," OECC 2018, 4B1-3, July (2018).

[354] K. Kasai, Y. Wang, S. Okamoto, M. Yoshida, and M. Nakazawa, "200 Gbit/s, 10 Gsymbol/s-1024 QAM Injection Locked Coherent Transmission over 160 km with a Pilot-Assisted Adaptive Equalizer," OECC 2018, 4B1-4, July (2018).

[355] T. Kan, K. Kasai, M. Yosida, T. Hirooka, and M. Nakazawa, "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," OECC 2018, 5B3-3, July (2018).

[356] K. Kimura, J. Nitta, M. Yoshida, K. Kasai, T. Hirooka, and M. Nakazawa, "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," OECC 2018, 5B3-4, July (2018).

[357] K. Kasai, M. Nakazawa, Y. Tomomatsu, and T. Endo, “Tunable Laser Diode with a Linewidth of 8 kHz and a RIN of -130 dB/Hz,” CLEO-PR 2018, W1J.4, August (2018).

[358] K. Kasai, M. Yoshida, T. Hirooka, K. Iwatsuki, and M. Nakazawa, “Backward-Rayleigh-Scattering Suppressed 160 Gbit/s 256 QAM Injection-Locked Bidirectional Coherent Transmission for Next Generation Mobile Fronthaul,” ECOC 2018, Th2.71, September (2018).

[359] T. Hirooka, R. Hirata, J. Wang, M. Yoshida, and M. Nakazawa, “Single-channel 10.2 Tbit/s PDM-DQPSK Nyquist pulse transmission over 300 km,” ECOC 2018, We3G.6, September (2018).

[333] Y. Wang, K. Kasai, M. Yoshida, and M. Nakazawa, “Single-carrier 216 Gbit/s, 12 Gsymbol/s 512 QAM coherent transmission over 160 km with injection-locked homodyne detection,” OFC 2017, Tu2E.1, March (2017).

[334] K. Kasai, M. Nakazawa, Y. Tomomatsu, and T. Endo, “Full C-band, mode-hop-free wavelength-tunable laser diode with a linewidth of 8 kHz and a RIN of -130 dB/Hz,” OFC 2017, W1E.2, March (2017).

[335] J. Yamamoto, T. Yajima, Y. Kinoshita, F. Ishii, M. Yoshida, T. Hirooka, and M. Nakazawa, “Fabrication of multi core fiber by using slurry casting method,” OFC 2017, Th1H.5, March (2017).

[336] M. Yoshida, J. Nitta, K. Kimura, K. Kasai, T. Hirooka, and M. Nakazawa, “Single-channel 3.84 Tbit/s, 64 QAM coherent Nyquist pulse transmission over 150 km with frequency-stabilized and mode-locked laser,” OFC 2017, Th2A.52, March (2017).

[337] T. Kan, K. Kasai, M. Yoshida, and M. Nakazawa, “42.3-Tbit/s, 18-Gbaud 64QAM WDM coherent transmission of 160 km over full C-band using an injection locking technique with a spectral efficiency of 9 bit/s/Hz,” OFC 2017, Th3F.5, March (2017).

[338] D. Suzuki, K. Kasai, T. Hirooka, and M. Nakazawa, “Subpicosecond Coherent Nyquist Pulse Generation for 1-Tbaud Transmission Using a C2H2 Frequency-Stabilized CW Laser and a 40 GHz Optical Comb Generator,” CLEO 2017, SM2L.5, May 2017.

[339] K. Harako, M. Yoshida, T. Hirooka, and M. Nakazawa, “40 GHz, 770 fs Harmonically and Regeneratively FM Mode-Locked Erbium Fiber Laser in L-Band,” CLEO 2017, SM4L.2, May 2017.

[340] M. Nakazawa, “Progress on 3M Communication Systems,” ISUPT 2017, Invited talk, July 2017.

[341] T. Hirooka, “PMD issues in Nyquist transmission,” ISUPT 2017, Invited talk, July 2017.

[342] M. Nakazawa, “Invention Of LD-pumped EDFA And Their Applications From Soliton To Coherent Nyquist Pulse Transmission, CLEO-PR 2017, Invited talk, 1-3F-2, August 2017.

[343] M. Yoshida, K. Kasai, T. Hirooka, M. Nakazawa, K. Imamura, and R. Sugizaki, “1024 QAM Coherent Optical Transmission In 31 Km-long, 19-core Fiber With Low Crosstalk And Large Effective Area,” OECC 2017, 3-1K-2, August 2017.

[344] M. Nakazawa, “Recent Progress on Ultra-High Capacity Optical Transmission using Multi-Level, Multi-Core, and Multi-Mode Techniques,” ICO-24, Invited talk, Tu2E-01, August 2017.

[345] K. Kimura, J. Nitta, M. Yoshida, K. Kasai, T. Hirooka, and M. Nakazawa, “A New Optical Phase-Locked System Between Ultrashort Pulses for 640 Gbaud Nyquist OTDM Coherent QAM Transmission,” ECOC 2017, M.1.F.2, September 2017.

[346] K. Kasai, Y. Wang, M. Yoshida, T. Hirooka, K. Iwatsuki, and M. Nakazawa, “80 Gbit/s/ch, 256 QAM Digital Coherent Optical Transmission System with Injection-Locking for Next Generation Mobile Fronthaul Network,” ECOC 2017, Th.1.B.5, September 2017.

[347] K. Kasai, T. Hirooka, M. Yoshida, M. Nakazawa, M. Shiraiwa, Y. Awaji, and N. Wada, “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,” ECOC 2017, P1.SC4.61, September 2017.

[316] T. Hirooka, M. Yoshida, K. Kasai, and M. Nakazawa, “Optical and wireless-integrated next-generation access network based on coherent technologies,” Photonics West 2016, Invited talk, 9772-2, February 2016.

[317] M. Yoshida, T. Hirooka, and M. Nakazawa, “Fused type fan-out device for multi-core fiber based on bundled structure,” OFC 2016, Tu3I.2.

[318] K. Kasai, M. Yoshida, and M. Nakazawa, “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,” OFC 2016, W3E.1.

[319] M. Yoshida, T. Hirooka, and M. Nakazawa, “Mode coupling measurement at a splice point between few-mode fibers using a synchronous multi-channel OTDR,” OFC 2016, Th1J.4.

[320] M. Nakazawa, “ “Multi” is everywhere,” CLEO 2016, plenary talk.

[321] M. Nakazawa and T. Hirooka, “A mode locking theory of the Nyquist laser,” CLEO 2016, JTu5A.107.

[322] T. Hirooka, K. Tokuhira, M. Yoshida, and M. Nakazawa, “A 440 fs, 9.2 GHz hybrid mode-locked erbium fiber laser with a combination of higher-order solitons and a SESAM saturable absorber,” CLEO 2016, STu1P.4

[323] M. Yoshida, K. Yoshida, K. Kasai, and M. Nakazawa, “A 0.95 ps, 10 GHz, 60 mW HCN frequency-stabilized and mode-locked fiber laser at 1.55 μm,” CLEO 2016, STu1P.3.

[324] K. Kasai, M. Nakazawa, M. Ishikawa, and H. Ishii, “An 8 kHz linewidth, 50 mW output wavelength tunable DFB LD array over the C-band with self optical feedback,” CLEO 2016, SW4M.2.

[325] M. Nakazawa, “Ultrahigh speed and high spectral efficiency transmission using optical Nyquist pulses,” OECC 2016, invited talk, MB1-1, July 2016.

[326] K. Harako, D. Suzuki, T. Hirooka, and M. Nakazawa, “Roll-off factor dependence of system performance in 1.28 Tbit/s/ch-525 km Nyquist pulse transmission,” OECC 2016, MB1-2, July 2016.

[327] M. Yoshida, K. Kasai, T. Hirooka, and M. Nakazawa, “1024 QAM, 7-core fiber/multi-core EDFA transmission over 100 km with an aggregated spectral efficiency of 109 bit/s/Hz,” OECC 2016, MB2-5, July 2016.

[328] Y. Wang, K. Kasai, M. Yoshida, and M. Nakazawa, “320 Gbit/s, 256 QAM LD-based coherent transmission over 160 km with an injection-locked homodyne detection technique,” OECC 2016, ThB3-3, July 2016.

[329] K. Kasai, M. Yoshida, T. Hirooka, and M. Nakazawa, “Injection-locked Homodyne Detection System for Higher-order QAM Digital Coherent Transmission,” ECOC 2016, invited talk, M1.C.3, September 2016.

[330] D. Suzuki, K. Harako, T. Hirooka, and M. Nakazawa, “Single-channel 5.12 Tbit/s (1.28 Tbaud) DQPSK Transmission over 300 km Using Non-coherent Nyquist Pulses,” ECOC 2016, W.4.P1.SC5.49, September 2016.

[331] K. Kasai, M. Yoshida, and M. Nakazawa, “552 Gbit/s, 46 Gbaud, 64 QAM Coherent Transmission over 160 km with Simple LD-based Injection-locked Homodyne Detection,” ECOC 2016, W.4.P1.SC5.51, September 2016.

[332] M. Nakazawa, M. Yoshida, T. Hirooka, K. Kasai, and T Hirano, “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,” ECOC 2016, W.4.P1.SC5.59, September 2016.

[301] T. Sakano, T. Komukai, A. Takahara, T. Hirooka, and M. Nakazawa, “Ad-hoc photonic network based on movable and deployable ICT resource unit to meet rapidly changing service demands,” OFC 2015, M2A.1.

[302] D. O. Otuya, K. Harako, K. Kasai, T. Hirooka, and M. Nakazawa, “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,” OFC 2015, M3G.2.

[303] K. Kasai, S. Beppu, Y. Wang, and M. Nakazawa, “256 QAM (polarization-multiplexed, 5 Gsymbol/s) coherent transmission with an injection-locked homodyne detection technique,” OFC 2015, W1E.4.

[304] M. Yoshida, T. Hirooka, K. Kasai, and M. Nakazawa, “Real-time 10vGbit/s-16 QAM quantum stream cipher transmission over 320 km with FPGA-based transmitter and receiver,” OFC 2015, W4F.4.

[305] A. Fujisaki, M. Yoshida, T. Hirooka, and M. Nakazawa, “Generation of 10 W, 100 fs, 10 GHz pulse train using high power EDFA-MOPA system with cascaded Raman pumping,” CLEO 2015, STh1L.7.

[306] T. Hirooka, M. Yoshida, K. Kasai, and M. Nakazawa, “Multi-core Fibers and Systems for Space-division Multiplexing,” Photonics North 2015, Invited talk, 7.60, June 2015.

[307] M. Nakazawa, “Ultrafast Spectrally-Efficient TDM Multiplexing/Demultiplexing Schemes Using Orthogonality in Coherent Optical Nyquist Pulses,” SPPCom 2015, Invited talk, SpM3E.1, June 2015.

[308] M. Nakazawa, “Distributed mode-coupling measurements in MCF and FMF using a synchronous multi-channel OTDR,” ISUPT/EXAT 2015, Invited talk, T1.2, July 2015.

[309] T. Hirooka, “Generation of optical Nyquist pulses and their applications to high speed/high spectral efficiency transmission,” ISUPT/EXAT 2015, Invited talk, M2.1, July 2015.

[310] K. Yoshida, K. Kasai, M. Yoshida, and M. Nakazawa, “HCN frequency-stabilized 10 GHz mode-locked fiber laser,” ISUPT/EXAT 2015, P-34, July 2015.

[311] D. Suzuki, D. Seya, K. Harako, T. Hirooka, and M. Nakazawa, “2.56 Tbit/s/ch polarization-multiplexed DQPSK non-coherent Nyquist pulse transmission over 525 km,” ISUPT/EXAT 2015, P-35, July 2015.

[312] K. Kasai, D. O. Otuya, K. Harako, T. Hirooka and M. Nakazawa, “High-Speed, High Spectrally Efficient 64 QAMOrthogonal TDM Coherent Nyquist Pulse Transmission,” IEEE Summer Topicals 2015, Invited talk, MF1.3, July 2015.

[313] M. Nakazawa, “QAM Quantum Noise Stream Cipher Transmission with Extremely High Security,” ECOC 2015, Invited talk, Th.2.5.1.

[314] M. Yoshida, T. Hirooka, K. Kasai, and M. Nakazawa, “Real-time Adaptive 4-64 QAM, 20-60 Gbit/s Quantum Noise Stream Cipher Transmission over 320 km with FPGA-based Transmitter and Receiver,” ECOC 2015, P.5.13.

[315] M. Yoshida, T. Hirooka, K. Kasai, and M. Nakazawa, “QAM quantum noise stream cipher using digital coherent optical transmission,” Forty-Ninth Asilomar Conference on Signals, Systems and Computers, Invited talk, TP1-9, November 2015.

[284] D. O. Otuya, K. Kasai, T. Hirooka, M. Yoshida, and M. Nakazawa, “1.92 Tbit/s, 64 QAM coherent Nyquist pulse transmission over 150 km with a spectral efficiency of 7.5 bit/s/Hz,” OFC 2014, W1A.4.

[285] S. Beppu, M. Yoshida, K. Kasai, and M. Nakazawa, “2048 QAM (66 Gbit/s) Single-Carrier Coherent Optical Transmission over 150 km with a Potential SE of 15.3 bit/s/Hz,” OFC 2014, W1A.6.

[286] T. Hirooka, M. Nakazawa, T. Komukai, and T. Sakano, “100 Gbit/s DP-QPSK transmission over a 32 km legacy multi-mode GI fiber using a real-time digital coherent transceiver,” OFC 2014, W2A.1.

[287] M. Nakazawa, M. Yoshida, and T. Hirooka, “Measurement of mode coupling distribution along a few-mode fiber using a synchronous multi-channel OTDR,” OFC 2014, W3D.7.

[288] D. Seya, K. Harako, T. Hirooka, and M. Nakazawa, “All-optical high-performance demultiplexing using optical Nyquist pulse sampling,” OFC 2014, W4F.2.

[289] M. Nakazawa, M. Yoshida, and K. Tsuzuki, “A 380 fs, 40 GHz mode-locked erbium fiber laser with an MQW nonlinear PM/AM modulator using the Pockels effect and the QCSE,” CLEO 2014, STu1N.6.

[290] K. Kasai, A. Fujisaki, M. Yoshida, T. Hirooka, M. Nakazawa, and S. Masuda, “A 160 mW output, 5 kHz linewidth frequency-stabilized erbium silica fiber laser with a short cavity configuration,” CLEO 2014, SW1N.4.

[291] M. Nakazawa, “Ultrahigh spectral efficiency systems - pushing the limits of multi-level modulation, multi-core fiber, and multi-mode control,” OECC 2014 (tutorial), WE7G-1.

[292] T. Hirooka, L. Chen, and M. Nakazawa, “Q margin comparison of RZ and Nyquist optical pulses in ultrahigh-speed TDM transmission,” OECC 2014, MO2B-3.

[293] Y. Wang, K. Kasai, M. Yoshida, and M. Nakazawa, “A 6 kHz linewidth, injection-locked LD using a master erbium fiber laser,” OECC 2014, TU6F-5.

[294] T. Yajima, J. Yamamoto, Y. Kinoshita, F. Ishii, T. Hirooka, M. Yoshida, and M. Nakazawa, “OH-free, low loss single-mode fibre fabricated by slurry casting / rod-in-tube method,” ECOC 2014, Th2.4.4.

[295] M. Yoshida, T. Hirooka, K. Kasai, and M. Nakazawa, “Real-time adaptive 4-64 QAM coherent optical transmission over 320 km with FPGA-based transmitter and receiver,” ECOC 2014, Th.2.5.2.

[296] K. Harako, D. O. Otuya, K. Kasai, T. Hirooka, and M. Nakazawa ,” Novel ultrafast TDM demultiplexing scheme using orthogonality in coherent Nyquist pulses,” ECOC 2014, Tu4.6.5.

[297] D. O. Otuya, K. Harako, K. Kasai, T. Hirooka, and M. Nakazawa, “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,” ECOC 2014, We.2.3.4.

[298] M. Nakazawa, "Exabit Optical Communication Infrastructure Using 3M Scheme," ACP 2014, Plenary Talk, November (2014).

[299] Y. Wang, S. Beppu, K. Kasai, M. Yoshida, and M. Nakazawa, "140 Gbit/s, 128 QAM LD-based Coherent Transmission over 150 km with an Injection-locked Homodyne Detection Technique," ACP 2014, ATh1E.3, November (2014).

[300] M. Nakazawa, M. Yoshida, and T. Hirooka, “A Single-channel 40 Gbit/s Digital Coherent QAM Quantum Stream Cipher Transmission over 480 km,” ACP 2014, ATh4E.1, November (2014).

[266] K. Kasai, Y. Wang, and M. Nakazawa, “An LD-Based Ultra-Low Phase Noise OPLL Circuit Using an Optical Voltage Controlled Oscillator,” Optical Fiber Communication Conference (OFC2013), OW3D.2, March (2013).

[267] T. Omiya, M. Yoshida, and M. Nakazawa, “400 Gbit/s 256 QAM-OFDM Transmission over 720 km with a 14 bit/s/Hz Spectral Efficiency Using an Improved FDE Technique,” Optical Fiber Communication Conference (OFC2013), OTh4E.1, March (2013).

[268] D. Otuya, K. Kasai, T. Hirooka, M. Yoshida, M. Nakazawa, T. Hara, and S. Oikawa, “A Single-Channel, 1.6 Tbit/s 32 QAM Coherent Pulse Transmission Over 150 km With RZ-CW Conversion and FDE Techniques,” Optical Fiber Communication Conference (OFC2013), OTh4E.4, March (2013).

[269] K. Harako, P. Ruan, T. Hirooka, and M. Nakazawa, “Large PMD Tolerant 1.28 Tbit/s/ch Transmission over 525 km with 640 Gbaud Optical Nyquist Pulses,” Optical Fiber Communication Conference (OFC2013), JW2A.38, March (2013).

[270] Y. Tsuchida, K. Maeda, K. Watanabe, T. Ito, K. Fukuchi, M. Yoshida, Y. Mimura, R. Sugizaki, and M. Nakazawa, “Multicore EDFA for DWDM transmission in full c-band,” Optical Fiber Communication Conference (OFC2013), JW2A.16, March (2013).

[271] A. Fujisaki, K. Kasai, M. Yoshida, T. Hirooka, and M. Nakazawa, “Generation of 9 W, 4 kHz linewidth 13C2H2 frequency-stabilized fiber laser output with core pumped erbium-doped amplifier,” Conference on Lasers and Electro-Optics (CLEO2013), CW3M.1, June (2013).

[272] T. Omiya, M. Yoshida, and M. Nakazawa, “1 Tbit/s 256 QAM-OFDM transmission over 560 km with 14.3 bit/s/Hz spectral efficiency,” OECC 2013, MR1-2.

[273] T. Sakano, H. Kubota, T. Komukai, T. Hirooka, and M. Nakazawa, “Resilient Photonic Network Architecture with Plug & play Optical Interconnection Technology,” OECC 2013, TuQ3-5.

[274] D. O. Otuya, K. Kasai, T. Hirooka, M. Yoshida, and M. Nakazawa, “A Single-Channel 1.92 Tbit/s, 64 QAM Coherent Pulse OTDM Transmission over 150 km,” OECC 2013, WR2-2.

[275] K. Harako, T. Hirooka, and M. Nakazawa, “Marked Reduction of Depolarization-Induced Crosstalk in Ultrahigh-Speed Pol-MUX Transmission with an Optical Nyquist Pulse,” OECC 2013, WR4-5.

[276] M. Yoshida, T. Hirooka, M. Nakazawa, “Measurement of Structural Irregularity Dependence on Mode Coupling along Multi-Core Fiber Using Multi-Channel OTDR System,” IEEE Summer Topicals 2013, MC3.3.

[277] T. Hirooka and M. Nakazawa, “"Orthogonal TDM Using Optical Nyquist Pulses,” Signal Processing in Photonic Communications (SPPCom 2013), Invited talk, SPM1D.3.

[278] T. Hirooka, M. Nakazawa, H. Kubota, T. Komukai, and T. Sakano, “Dynamic optical transport connection with a 100 Gbit/s digital coherent optical transponder for disaster-resilient networking,” IEEE Region 10 Humanitarian Technology Conference (IEEE R10-HTC 2013), TS10-4, August (2013).

[279] Y Wang, K Kasai, T Omiya, and M Nakazawa, “120 Gbit/s, 64 QAM Coherent Transmission Employing an Optical Voltage Controlled Oscillator,” ECOC 2013, Mo.4.C.2.

[280] K Koizumi, T Hirooka, M Yoshida, and M Nakazawa, “Single-channel 1.28 Tbit/s Transmission over 58 km in the 1.1 μm Band with Wideband GVD and Dispersion Slope Compensation,” ECOC 2013, We.4.C.2.

[281] M. Nakazawa, "Exa-bit optical communication exploring by 3M scheme," 18th Microoptics Conference (MOC’13), Plenary Talk.

[282] M. Nakazawa, M. Yoshida, and T. Hirooka, “Nondestructive measurement of mode-coupling along a multi-core fiber using a synchronous multi-channel OTDR,” International Symposium on Extremely Advanced Transmission Technology (EXAT 2013), pp. 60-63 (2013).

[283] K. Imamura, R. Sugizaki, T. Yagi, M. Yoshida, and M. Nakazawa, “Investigation of the Influence of Fusion Splice on Crosstalk Properties of Multicore Fiber,” IWCS 2013, P-1.

[265] M. Nakazawa, “Preparation for Ultrahigh-Capacity SDM Transmission,” IEEE Photonics Society Summer Topical Meeting (SUM2012), Invited paper, MC2.2, July (2012).

[264] T. Yajima, J. Yamamoto, F. Ishii, T. Hirooka, M. Yoshida, and M. Nakazawa, "Low Loss Photonic Crystal Fiber Fabricated by Slurry Casting Method," Conference on Lasers and Electro Optics (CLEO2012), CTh3G.1, May (2012).

[263] T. Omiya, K. Toyoda, M. Yoshida, and M. Nakazawa, “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,” Optical Fiber Communication Conference (OFC2012), OM2A.7, March (2012).

[262] T. Hirooka, K. Harako, P. Guan, and M. Nakazawa, “Bandwidth and distance dependences of depolarization-induced crosstalk in polarization-multiplexed transmission,” Optical Fiber Communication Conference (OFC2012), JW2A.44, March (2012).

[261] M. Nakazawa, M. Yoshida, and T. Hirooka, “Measurement of Mode Couplings along a Multi-Core Fiber Using a Multi-Channel OTDR,” Optical Fiber Communication Conference (OFC2012), OTh3I.3, March (2012).

[260] M. Nakazawa, “Extremely Advanced Transmission with 3M Technologies (Multi-level Modulation, Multi-core & Multi-mode),” Optical Fiber Communication Conference (OFC2012), OTu1D.1 (Invited talk), March (2012).

[259] Y. Hori, Z. Zhang, and M. Nakazawa, “1070 nm passively mode-locked ytterbium-doped fiber solition laser with SWNT/PMMA saturable absorber,” 17th Microoptics Conference (MOC’11), H-18, Oct. (2011).

[258] K. Koizumi, M. Yoshida, T. Hirooka, and M. Nakazawa, “10 GHz, 1.1 ps pulse generation from a harmonically and regeneratively mode-locked Yb fiber laser at 1.1 μm,” 17th Microoptics Conference (MOC’11), H-22, Oct. (2011).

[257] K. Kasai, M. Nakazawa, and H. Yamazaki, “Absolute frequency stabilization of a laser diode based on triple ring resonators to an C2H2 absorption line,” 17th Microoptics Conference (MOC’11), G-4, Oct. (2011).

[256] M. Yoshida, F. Suzuki, T. Morisaki, and M. Nakazawa, “Absolutely optical-frequency-stabilized cesium optical atomic clock,” 17th Microoptics Conference (MOC’11), B-2, Oct. (2011).

[255] M. Nakazawa, “CNT-based mode-locked lasers,” 17th Microoptics Conference (MOC’11), E-2, Oct. (2011).

[254] M. Nakazawa, “ “Multi” is everywhere,” Chitose International Forum on Photonics Science & Technology, Plenary Talk, Oct. (2011).

[253] P. Guan, T. Hirano, K. Harako, Y. Tomiyama, T. Hirooka, and M.Nakazawa, “2.56 Tbit/s/ch Polarization-mutliplexed DQPSK Transmission over 300 km Using Time-domain optical Fourier Transformation,” European Conference on Optical Communication (ECOC2011), We.10.P1,80, September (2011).

[252] M. Nakazawa, K. Kasai, M. Yoshida, and T. Hirooka, “Novel RZ-CW Conversion Scheme for Ultra Multi-level, High-speed Coherent OTDM Transmission,” European Conference on Optical Communication (ECOC2011), We.10.P1,75, September (2011).

[251] T. Hirooka, K. Kasai, and M. Nakazawa, “Recent Progress on Ultra-high Speed and Multi Level Coherent Transmission,” Korea-Japan Workshop on Beyond 100G, Invited Talk, June (2011).

[250] M. Nakazawa, “ “Multi” is everywhere,” Korea-Japan Workshop on Beyond 100G, Plenary Talk, June (2011).

[249] M. Nakazawa, "Ultrafast and high-spectral-density optical communications systems," Conference on Lasers and Electro-Optics (CLEO 2011), Invited talk, CThGG3, May (2011).

[248] K. Kasai, A. Mori, and M. Nakazawa, "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," Conference on Lasers and Electro-Optics (CLEO 2011), CTuV4, May (2011).

[247] K. Koizumi, M. Yoshida, T. Hirooka, and M. Nakazawa, "A 10 GHz 2.5 ps regeneratively mode-locked Yb fiber laser in the 1.1 μm band," Conference on Lasers and Electro-Optics (CLEO 2011), CMBB3, May (2011).

[246] T. Hirooka, T. Hirano, P. Guan, M. Nakazawa, "New PMD-induced crosstalk in the presence of PDL in a polarization-multiplexed ultrahigh-speed transmission," Optical Fiber Communication Conference (OFC 2011), JThA44, March (2011).

[245] M. Yoshida, T. Omiya, K. Kasai, M. Nakazawa, "Real-time FPGA-based coherent optical receiver for 1 Gsymbol/s, 64 QAM transmission," Optical Fiber Communication Conference (OFC 2011), OTuN3, March (2011).

[244] T. Hirooka and M. Nakazawa, "Recent progress on ultra-high speed and multi level coherent transmission," Photonics 2010, Invited talk, M2B3, December (2010).

[243] S. Okamoto, K. Toyoda, T. Omiya, K. Kasai, M. Yoshida, and M. Nakazawa, "512 QAM (54 Gbit/s) coherent optical transmission over 150 km with an optical bandwidth of 4.1 GHz," European Conference on Optical Communication (ECOC 2010), PD2.3, September (2010).

[242] P. Guan, H. C. Hansen Mulvad, Y. Tomiyama, T. Hirano, T. Hirooka, and M. Nakazawa, "1.28 Tbit/s/channel single-polarization DQPSK transmission over 525 km using ultrafast time-domain optical Fourier transformation," European Conference on Optical Communication (ECOC 2010), We.6.C.3, September (2010).

[241] H. C. Hansen Mulvad, P. Guan, K. Kasai, T. Hirooka, and M. Nakazawa, "High-resolution 640 Gbit/s clock recovery using time-domain optical Fourier transformation and narrowband optical filter," European Conference on Optical Communication (ECOC 2010), Mo.1.A.6, September (2010).

[240] M. Nakazawa, "Giant leaps in optical communication technologies towards 2030 and beyond," European Conference on Optical Communication (ECOC 2010), Plenary Talk, September (2010).

[239] M. Nakazawa, "Ultrahigh-speed coherent RZ pulse transmission with OTDM technology," International Symposium on Ultra-high Capacity Optical Communication and Related Optical Signal Processing and Devices, Invited talk, September (2010).

[238] M. Nakazawa, "Hardware paradigm shifts in the optical communication infrastructure with three "M technologies," Opto Electronics and Communications Conference (OECC 2010), Plenary Talk, July (2010).

[237] F. Shohda M. Nakazawa, R. Akimoto, and H. Ishikawa, "An 88 fs fiber soliton laser at 1.56 μm using a quantum well saturable absorber with an ultrafast intersubband transition," Conference on Lasers and Electro-Optics (CLEO 2010), JTuD60, May (2010).

[236] F. Shohda, M. Nakazawa, J. Mata, and J. Tsukamoto, "A film-type saturable absorber with P3HT-incorporated single-wall carbon nanotubes coated on polyamide and its application to a femtosecond fiber laser," Conference on Lasers and Electro-Optics (CLEO 2010), JTuD52, May (2010).

[235] K. Kasai and M. Nakazawa, "A C2H2 frequency-stabilized laser diode with a linewidth of 4 kHz and its application to an optical phase-locked loop," Conference on Lasers and Electro-Optics (CLEO 2010), CTuKK7, May (2010).

[234] T. Morisaki, M. Yoshida, and M. Nakazawa, "Optical frequency-tunable Cs atomic clock with a mode-hop-free fiber laser," Conference on Lasers and Electro-Optics (CLEO 2010), CMN2, May (2010).

[233] K. Koizumi, M. Yoshida, and M. Nakazawa, "A 10 GHz opto-electronic oscillator at 1.1 μm using a gain-switched InGaAs VCSEL and a photonic crystal fiber," Conference on Lasers and Electro-Optics (CLEO 2010), CMA7, May (2010).

[232] M. Nakazawa, "Device requirements for next generation optical transmission technology," Tutorial, ECIO 2010, FrC1, April (2010).

[231] T. Hirooka, "Recent Progress on OTDM Terabit/s Transmission and Their Future," Tutorial talk, Optical Fiber Communication Conference (OFC 2010), OWM5, March (2010).

[230] K. Koizumi, M. Yoshida, T. Hirooka, and M. Nakazawa, "10 Gbit/s Photonic Crystal Fiber Transmissions with 1.1 μm Directly-Modulated Single-Mode VCSEL," Optical Fiber Communication Conference (OFC 2010), OWK3, March (2010).

[229] T. Hirano, P. Guan, T. Hirooka, and M. Nakazawa, "640 Gbit/s Single-Polarization DPSK Transmission over 525 km with Time-Domain Optical Fourier Transformation in a Round-Trip Configuration," Optical Fiber Communication Conference (OFC 2010), OThD7, March (2010).

[228] K. Kasai, T. Omiya, P. Guan, M. Yoshida, T. Hirooka, and M. Nakazawa, "Single-Channel 400 Gbit/s, OTDM-32 RZ/QAM Coherent Transmission over 225 km Using an Optical Phase-Locked Loop Technique," Optical Fiber Communication Conference (OFC 2010), OThD6, March (2010).

[227] S. Okamoto, T. Omiya, K. Kasai, M. Yoshida, and M. Nakazawa, "140 Gbit/s Coherent Optical Transmission over 150 km with a 10 Gsymbol/s Polarization-Multiplexed 128 QAM Signal," Optical Fiber Communication Conference (OFC 2010), OThD5, March (2010).

[226] M. Nakazawa, S. Okamoto, T. Omiya, K. Kasai, and M. Yoshida, "256 QAM (64 Gbit/s) Coherent Optical Transmission over 160 km with an Optical Bandwidth of 5.4 GHz," Optical Fiber Communication Conference (OFC 2010), OMJ5, March (2010).

[225] P. Guan, M. Okazaki, T. Hirano, T. Hirooka, and M. Nakazawa, "Low-penalty 5x320 Gbit/s (1.6 Tbit/s) WDM DPSK transmission over 525 km using time-domain optical Fourier transformation," European Conference on Optical Communication (ECOC 2009), 6.4.4, September (2009).

[224] T. Hirooka, M. Okazaki, T. Hirano, P. Guan, M. Nakazawa, and S. Nakamura, "All-optical demultiplexing of 640 Gbit/s OTDM-DPSK signal using a semiconductor SMZ switch," European Conference on Optical Communication (ECOC 2009), 4.3.2, September (2009).

[223] T. Omiya, H. Goto, K. Kasai, M. Yoshida, and M. Nakazawa, "24 Gbit/s, 64 QAM-OFDM coherent transmission with a bandwidth of 2.5 GHz," European Conference on Optical Communication (ECOC 2009), 1.3.2, September (2009).

[222] T. Hirooka and M. Nakazawa, "Ultrafast transmission technology using time-domain optical Fourier transformation," IEEE/LEOS Summer Topicals 2009, Invited paper, MC2.4, July (2009).

[221] M. Nakazawa, "Recent progress on ultrafast/ultrashort/frequency-stabilized erbium-doped fiber lasers and their applications," International Conference on Materials for Advanced Technologies (ICMAT 2009), Invited paper, P-S1.3-4, June (2009).

[220] M. Yoshida, I. Kashiwamura, T. Hirooka, and M. Nakazawa, "Delivery of an Ultrastable Cs Optical Atomic Clock Using a JGN II Optical Test Bed" Conference on Lasers and Electro Optics (CLEO 2009), CTuS3, May (2009).

[219] M. Nakazawa, M. Yoshida, and K. Kasai, "C2H2 Absolutely Optical Frequency-Stabilized and 40 GHz Repetition-Rate-Stabilized, Regeneratively Mode-Locked Picosecond Erbium Fiber Laser at 1.53 μm," Conference on Lasers and Electro Optics (CLEO 2009), CMY4, May (2009).

[218] F. Shohda, T. Shirato, M. Nakazawa, J. Mata, and J. Tsukamoto, "147 fs, 51 MHz Soliton Fiber Laser at 1.56 μm with a Fiber-Connector-Type SWNT/P3HT Saturable Absorber," Conference on Lasers and Electro Optics (CLEO 2009), CML6, May (2009).

[217] F. Shohda, T. Shirato, M. Nakazawa, K. Komatsu, and T. Kaino, "A Passively Mode-Locked Femtosecond Soliton Fiber Laser at 1.5 μm with a CNT-Doped Polycarbonate Saturable Absorber," Conference on Lasers and Electro Optics (CLEO 2009), CML4, May (2009).

[216] M. Nakazawa, “Optical quadrature amplitude modulation (QAM) with coherent detection up to 128 states,” Optical Fiber Communication Conference (OFC 2009), Invited paper, OThG1, March (2009).

[215] M. Nakazawa and M. Yoshida, "New scheme for independently stabilizing the repetition rate and optical frequency of a laser using a regenerative mode-locking technique," OSA Annual Meeting, Laser Science (LS2008), LTuF3, October (2008).

[214] M. Nakazawa, "Toward the Shannon limit optical communication," Invited paper, OSA Annual Meeting, Fronters in Optics (FiO2008), FTuH3, October (2008).

[213] M. Okazaki, P. Guan, T. Hirooka, M. Nakazawa, and T. Miyazaki, "160 Gbit/s-200 km field transmission experiment using a time-domain optical Fourier transformation technique with a large PMD," European Conference on Optical Communication (ECOC 2008), P.4.12, September (2008).

[212] T. Hirooka, M. Okazaki, P. Guan, and M. Nakazawa, "320 Gbit/s single-polarization DPSK transmission over 525 km using time-domain optical Fourier transformation," European Conference on Optical Communication (ECOC 2008), We2.E.6, September (2008).

[211] M. Nakazawa, "Challenges to FDM-QAM coherent transmission with ultrahigh spectral efficiency," European Conference on Optical Communication (ECOC 2008), Invited paper, Tu.1.E.1, September (2008).

[210] M. Yoshida, H. Goto, T. Omiya, K. Kasai, and M. Nakazawa, "Frequency division multiplexed 1 Gsymbol/s, 64 QAM coherent optical transmission with a spectral efficiency of 8.6 bit/s/Hz," European Conference on Optical Communication (ECOC 2008), Invited paper, Mo.4.D.5, September (2008).

[209] M. Nakazawa, "Novel modulation format and high spectral efficiency technology for coherent optical communication systems," IEEE/LEOS Summer Topicals 2008, Invited paper, TuC2.1, July (2008).

[208] M. Nakazawa, "Optical communication going ahead of wireless communication in terms of spectral efficiency," Workshop on High Spectral Density Optical Communication for New Generation Network, Invited talk, June (2008).

[207] F. Shohda, T. Shirato, M. Nakazawa, K. Komatsu, and T. Kaino, "1.5 m passively mode-locked femtosecond fiber laser with CNT-doped polymer saturable absorber," International Laser, Light-Wave and Microwave Conference (ILLMC 2008), 23-TP1-7, April (2008).

[206] M. Nakazawa, "1.5 μm femtsecond fiber laser with CNT-doped polymer saturable absorber," The 8th International Mini-Symposium on Advanced Organic Photonics (ISAOP-8), Invited talk, I-11, February (2008).

[205] H. Goto, K. Kasai, M. Yoshida, and M. Nakazawa, "Polarization-multiplexed 1 Gsymbol/s, 128 QAM (14 Gbit/s) coherent optical transmission over 160 km using a 1.4 GHz Nyquist filter," Optical Fiber Communication Conference (OFC2008), JThA45, February (2008).

[204] T. Hirooka and M. Nakazawa, "All-optical 40 GHz time-domain Fourier transformation using XPM with a dark parabolic pulse," Optical Fiber Communication Conference (OFC2008), OThG5, February (2008).

[203] T. Hirooka, M. Nakazawa, and K. Okamoto, "40 GHz bright and dark parabolic pulse generation using a picosecond optical pulse source and a 64-channel AWG," Optical Fiber Communication Conference (OFC2008), OTuC6, February (2008).

[202] M. Nakazawa, "Advanced optical fiber device technology for ultrahigh-speed transmission," 5th Workshop on Fibers and Optical Passive Components (WFOPC2007), Plenary Talk, December (2007).

[201] T. Hirooka, K. Osawa, M. Okazaki, M. Nakazawa, and H. Murai, "Observation of stimulated Brillouin scattering in ultrahigh-speed in-phase and carrier-suppressed RZ OTDM transmission," European Conference on Optical Communication (ECOC2007), P085, September (2007).

[200] A. Suzuki, H. T. Quynhanh, M. Yoshida, and M. Nakazawa, "A /4-shifted distributed feedback semiconductor fiber ring laser with an OSNR of 85 dB and a linewidth of 7 kHz," European Conference on Optical Communication (ECOC2007), 1.4.2, September (2007).

[199] T. Hirooka, M. Okazaki, K. Osawa, and M. Nakazawa, "160 Gbit/s-900 km DPSK transmission with time-domain optical Fourier transformation," European Conference on Optical Communication (ECOC2007), 1.3.3, September (2007).

[198] M. Nakazawa, "New frontiers in optical communication: ultrahigh-speed transmission and coherent transmission," The 3rd International Symposium on Ultrafast Photonic Technolgies, Invited paper, I-1, August (2007).

[197] M. Nakazawa and T. Hirooka, "Terabit OTDM transmission-Key challenges," IEEE/LEOS Summer Topicals 2007, Invited paper, ME3.3, July (2007).

[196] M. Nakazawa, "QAM based coherent transmission technologies using DSP," IEEE/LEOS Summer Topicals 2007, Invited paper, TuA4.1, July (2007).

[195] K. Kasai, J. Hongo, H. Goto, M. Yoshida, and M. Nakazawa, "1 Gsymbol/s, 64 QAM coherent optical transmission with a spectral efficiency of 8 bit/s/Hz using a Nyquist filter," Optoelectronics and Communications Conference (OECC2007), Postdeadline paper PD1-1, July (2007).

[194] M. Yoshida, A. Ono, and M. Nakazawa, "10 GHz regeneratively mode-locked SOA fiber ring laser and its linewidth characteristics," Optoelectronics and Communications Conference (OECC2007), 13C4-2, July (2007).

[193] Q. A. Ho Thi, A. Suzuki, and M. Nakazawa, "A ring-type polarization-maintaining /4-shifted distributed feedback fiber laser pumped by 0.98 m laser diode," Optoelectronics and Communications Conference (OECC2007), 12C2-2, July (2007).

[192] H. Hasegawa, Y. Oikawa, T. Hirooka, and M. Nakazawa, "40 Gbit/s-2 km photonic crystal fiber transmission with a single-mode VCSEL," Optoelectronics and Communications Conference (OECC2007), 11P-8, July (2007).

[191] H. Hasegawa, Y. Oikawa, and M. Nakazawa, "10 Gbit/s-2 km photonic crystal fiber transmission over 850 nm with a directly modulated single-mode VCSEL," Optoelectronics and Communications Conference (OECC2007), 10B2-5, July (2007).

[190] K. Osawa, M. Okazaki, T. Hirooka, and M. Nakazawa, "Low power-penalty 160 Gbit/s DPSK transmission over 600 km," Optoelectronics and Communications Conference (OECC2007), 10B2-2, July (2007).

[189] T. Hirooka and M. Nakazawa, "Ultrahigh-speed signal transmission / processing technologies," Optoelectronics and Communications Conference (OECC2007), Invited paper, 10B2-1, July (2007).

[188] M. Nakazawa, "Advanced optical fiber and fiber device technologies for ultrahigh-speed optical transmission," Optoelectronics and Communications Conference (OECC2007), Tutotiral, 11C2-1, July (2007).

[187] M. Nakazawa, "Next generation ultrafast telecommunications technologies," CLEO Europe 2007, Invited paper, TF1-3TUE, June (2007).

[186] T. Hirayama, M. Yoshida, M. Nakazawa, K. Hagimoto, and T. Ikegami, "An ultrastable Cs optical atomic clock with a regeneratively mode-locked fiber laser and an optically pumped Cs gas cell," Conference on Lasers and Elecro-Optics (CLEO 2007), Postdeadline paper, CPDB11, May (2007).

[185] M. Nakazawa, "A new Cs optical atomic clock using ultrastable fiber laser and optical comb delivery through optical network," NMIJ-BIPM Joint Workshop, Invited talk, May (2007).

[184] T. Hirayama, M. Yoshida, M. Nakazawa, K. Hagimoto, and T. Ikegami, "A mode-locked laser-type optical atomic clock with an optically pumped Cs gas cell," Asia-Pacific Microwave Photonics Conference (AP-MWP 2007), D-38, April (2007).

[183] K. Kasai, J. Hongou, M. Yoshida, and M. Nakazawa, "Highly spectral-efficient QAM coherent transmission using an optical phase-locked loop over long distances," Asia-Pacific Microwave Photonics Conference (AP-MWP 2007), C-3, April (2007).

[182] M. Nakazawa, "Advanced fiber laser technology for microwave photonics," Asia-Pacific Microwave Photonics Conference (AP-MWP 2007), Plenary Talk, April (2007).

[181] M. Nakazawa, J. Hongo, K. Kasai, and M. Yoshida, "Polarization-multiplexed 1 Gsymbol/s, 64 QAM (12 Gbit/s) coherent optical transmission over 150 km with an optical bandwidth of 2 GHz," Optical Fiber Communication Conference (OFC 2007), Postdeadline paper, PDP26, March (2007).

[180] K. Kasai, M. Yoshida, and M. Nakazawa, "Optical phase-locked loop for coherent transmission over 500 km," Optical Fiber Communication Conference (OFC 2007), JWA49, March (2007).

[179] M. Yoshida, K. Kasai, and M. Nakazawa, "A mode-hop-free, frequency-tunable 40 GHz mode-locked fiber laser," Optical Fiber Communication Conference (OFC 2007), OTuF3, March (2007).

[178] J. Hongou, K. Kasai, M.Yoshida, and M. Nakazawa, "1 Gsymbol/s, 64 QAM coherent optical transmission over 150 km with a spectral efficiency of 3 bit/s/Hz," Optical Fiber Communication Conference (OFC 2007), OMP3, March (2007).

[177] M. Yoshida, K. Kasai, J. Hongo, and M. Nakazawa, "A C2H2 frequency-stabilized erbium-doped fiber laser and its application to coherent communication," SPIE Photonics West 2007, 6453-85, Invited paper, January (2007).

[176] K. Watabe, T. Hirayama, T. Ikegami, K. Hagimoto, S. Ohshima, M. Yoshida, and M. Nakazawa, "Characteristics of Coherent Population Trapping Signals of Cs-D1 and Cs-D2 Lines," Asia pacific Time and Frequency Workshop (ATF-2006), New Delhi, India, December (2006).

[175] K. Kasai, M. Yoshida, and M. Nakazawa, "A 1.54 m 13C2H2 frequency-stabilized, single-polarization fiber ring laser," European Optical Society (EOS) Annual Meeting 2006, October (2006).

[174] A. Suzuki, Y. Takahashi, and M. Nakazawa, "Polarization-maintained, ultranarrow FBG filter with 1.3 GHz linewidth," European Optical Society (EOS) Annual Meeting 2006, October (2006).

[173] T. Hirooka, T. Kumakura, K. Osawa, and M. Nakazawa, "Comparison of 40 GHz optical demultiplexers using SMZ switch and EA modulator in 160 Gbit/s-500 km OTDM transmission," European Optical Society (EOS) Annual Meeting 2006, October (2006).

[172] H. Hasegawa, Y. Oikawa, T. Hirooka, M. Yoshida, K. Suzuki, Y. Inoue, and M. Nakazawa, "10 Gb/s x 4 channel WDM transmission over 3 km in the 800 nm region using photonic crystal fibers," European Conference on Optical Communication (ECOC 2006), We4.5.4, September (2006).

[171] A. Suzuki, Y. Takahashi, M. Yoshida, and M. Nakazawa, "An ultra-low noise and narrow linewidth /4-shifted DFB Er-doped fiber laser with a ring configuration," European Conference on Optical Communication (ECOC 2006), Th2.3.2, September (2006).

[170] T. Hirooka, K. Hagiuda, T. Kumakura, K. Osawa, and M. Nakazawa, "160 Gbit/s-600 km OTDM transmission using time-domain optical Fourier transformation," European Conference on Optical Communication (ECOC 2006), Tu1.5.4, September (2006).

[169] M. Nakazawa, M. Yoshida, K. Kasai, and J. Hongou, "20 Msymbol/s 128 QAM coherent optical transmission over 500 km using heterodyne detection with frequency-stabilized laser," European Conference on Optical Communication (ECOC 2006), Mo4.2.2, September (2006).

[168] H. Inaba, Y. Daimon, F.-L. Hong, A. Onae, K. Minoshima, T. R. Schibli, M. Hirano, T. Okuno, M. Onishi, M. Nakazawa and H. Matsumoto, "Robust and low-noise fiber based frequency comb for long-term measurement of optical frequencies," Conference on Precision Electromagnetic Measurements (CPEM 2006), Wea1-2, Torino, Itary, July (2006).

[167] M. Nakazawa, "Ultrahigh-speed fiber laser and its application to optical metrology," Conference on Lasers and Electro-Optics (CLEO 2006), CTuV4, Invited paper, May 21-26 (2006).

[166] M. Nakazawa, "Regeneratively Mode-Locked Laser as an Opto-Electronic Microwave Oscillator and Its Application to Optical Metrology," 2006 Asia-Pacific Microwave Photonics Conference (AP-MWP 2006), K-1, Invited paper, Kobe, Japan, April 24-26 (2006).

[165] K. Hagimoto, T. Hirayama, K. Watanabe, T. Ikegami, S. Ohshima, M. Yoshida, and M. Nakazawa, "Characteristics of CPT signals of Cs-D1 and Cs-D2 lines," Workshop on Chip Scale Atomic Clock: Status and Potentiality, 2-3, March (2006).

[164] K. Kasai, M. Yoshida, and M. Nakazawa, "A 13C2H2 frequency-stabilized, polarization-maintained 1.54 m erbium fiber ring laser with a new feedback system," Optical Fiber Communication Conference (OFC 2006), OWM4, March (2006).

[163] H. Hasegawa, Y. Oikawa, T. Hirooka, M. Yoshida, and M. Nakazawa, "10 Gb/s transmission over 3 km at 850 nm using single-mode photonic crystal fiber, single-mode VCSEL, and Si-APD," Optical Fiber Communication Conference (OFC 2006), JThB4, March (2006).

[162] M. Nakazawa, S. Nakahara, T. Hirooka, M. Yoshida, T. Kaino, and K. Komatsu, "Polymer saturable absorber materials in 1.5 m band using PMMA and PS with single-wall carbon nanotubes," Optical Fiber Communication Conference (OFC 2006), OThQ4, March (2006).

[161] T. Hirooka and M. Nakazawa, "Derivation of analytical expression for third-order dispersion elimination using time-domain optical Fourier transformation," European Conference on Optical Communication (ECOC 2005), We4.P.76, September (2005).

[160] M. Yoshida, T. Hirayama, M. Yakabe, M. Nakazawa, Y. Koga, and K. Hagimoto, "An ultrastable PLL mode-locked fiber laser with a hydrogen maser clock," International Conference on Quantum Electronics and the Pacific Rim Conference on Lasers and Electro-Optics (IQEC/CLEO-PR 2005), Tokyo, Japan, CFM3-4, July (2005).

[159] T. Hiayama, M. Yakabe, M. Yoshida, M. Nakazawa, Y. Koga, and K. Hagimoto, "An ultrastable Cs optical atomic clock with a 9.1926-GHz low-drift regeneratively mode-locked fiber laser," International Conference on Quantum Electronics and the Pacific Rim Conference on Lasers and Electro-Optics (IQEC/CLEO-PR 2005), Tokyo, Japan, CFM3-3, July (2005).

[158] T. Hirooka and M. Nakazawa, "Ultrahigh-speed distortion-free transmission using all-optical time-domain Fourier transformation," International Conference on Quantum Electronics and the Pacific Rim Conference on Lasers and Electro-Optics (IQEC/CLEO-PR 2005), Tokyo, Japan, Invited paper, CFJ3-4-INV, July (2005).

[157] K. Osawa, K. Haneda, T. Hirooka, M. Yoshida, W. Suttawassuntorn and M. Nakazawa, "Measurement of optical carrier spectrum deformation in high-speed pulse transmission," International Conference on Quantum Electronics and the Pacific Rim Conference on Lasers and Electro-Optics (IQEC/CLEO-PR 2005), Tokyo, Japan, CFJ3-3, July (2005).

[156] H. Hasegawa, T. Hirooka and M. Nakazawa, "A new method for optimum dispersion designing of zero-dispersion and dispersion-flattened photonic crystal fibers," International Conference on Quantum Electronics and the Pacific Rim Conference on Lasers and Electro-Optics (IQEC/CLEO-PR 2005), Tokyo, Japan, CWE2-6, July (2005).

[155] H. Hasegawa, M. Kikegawa , M. Yoshida, T. Hirooka, and M. Nakazawa, "Observation of optimum air-hole tapering of splicing between a conventional fiber and a photonic crystal fiber and analysis of reduction of Fresnel reflection," International Conference on Quantum Electronics and the Pacific Rim Conference on Lasers and Electro-Optics (IQEC/CLEO-PR 2005), Tokyo, Japan, CWE2-4, July (2005).

[154] Y. Oikawa, H. Hasegawa, M. Yoshida, T. Hirooka, and M. Nakazawa, "Ultra-broadband dispersion measurement of a photonic crystal fiber with pico-second streak camera and group-delay-free supercontinuum," International Conference on Quantum Electronics and the Pacific Rim Conference on Lasers and Electro-Optics (IQEC/CLEO-PR 2005), Tokyo, Japan, CWE2-1, July (2005).

[153] K. Kasai, M. Yoshida, M. Nakazawa, K. Shiota, and S. Masuda, "A 13C2H2 frequency-stabilized, polarization-maintained erbium fiber ring laser with no frequency modulation," International Conference on Quantum Electronics and the Pacific Rim Conference on Lasers and Electro-Optics (IQEC/CLEO-PR 2005), Tokyo, Japan, CWI1-6, July 11-15 (2005).

[152] K. Kasai, M. Yoshida, and M. Nakazawa, "A C2H2 frequency-stabilized, single-polarization fiber laser," NMIJ-BIPM Workshop on the Impact of Information Technology in Metrology, P-13, May 18-20 (2005).

[151] T. Hirayama, M. Yakabe, M. Yoshida, M. Nakazawa, Y. Koga, K. Hagimoto, and T. Ikegami, "An ultrastable Cs optical atomic clock with a laser-type opto-microwave oscillator," NMIJ-BIPM Workshop on the Impact of Information Technology in Metrology, P-12, May 18-20 (2005).

[150] K. Osawa, K. Haneda, S. Waiyapot, and M. Nakazawa, "Measurement of longitudinal linewidth broadening of mode-locked lasers during ultrahigh-speed pulse transmission," NMIJ-BIPM Workshop on the Impact of Information Technology in Metrology, P-11, May 18-20 (2005).

[149] M. Yoshida, T. Hirayama, M. Yakabe, M. Nakazawa, Y. Koga, K. Hagimoto, and T. Ikegami, "An ultrastable PLL mode-locked fiber laser with a hydrogen maser clock," NMIJ-BIPM Workshop on the Impact of Information Technology in Metrology, P-10, May 18-20 (2005).

[148] M. Nakazawa, "Ultrastable mode-locked fiber lasers and their application to optical comb delivery through optical fiber networks," NMIJ-BIPM Workshop on the Impact of Information Technology in Metrology, Invited paper, WS-06, May 18-20 (2005).

[147] K. Kasai, M. Yoshida, and M. Nakazawa, "A 13C2H2 frequency-stabilized, polarization-maintained erbium fiber ring laser with no frequency modulation," European Conference on Optical Communication (ECOC 2004), Th1.3.5, September (2004).

[146] K. Hagiuda, T. Hirooka, S. Ono, M. Yoshida, M. Nakazawa, S. Arahira, and Y. Ogawa, "Generation of a 40-GHz, 100-fs pulse train from a mode-locked laser diode using DDF soliton compression," European Conference on Optical Communication (ECOC 2004), Tu3.3.2, September (2004).

[145] T. Hirooka, M. Nakazawa, F. Futami, and S. Watanabe, "New adaptive equalization scheme for 160 Gb/s transmitted signal using time-domain optical Fourier transformation," European Conference on Optical Communication (ECOC 2004), Th1.5.3, September (2004).

[144] M. Yakabe, K. Nito, M. Yoshida, M. Nakazawa, Y. Koga, K. Hagimoto, and T. Ikegami, "A new ultrastable cesium optical atomic clock with a 9.1926-GHz regeneratively mode-locked fiber laser," International Conference on Ultrafast Phenomena (UP 2004), FA1, July (2004).

[143] H. Furumochi, A. Tada, K. Hirosawa, F. Kannari, M. Takeoka, and M. Nakazawa, "Photon number squeezing of ultrabroadband pulses generated by microstructure fibers," International Conference on Ultrafast Phenomena (UP 2004), ThD38, Niigata, Japan, July (2004).

[142] K. Haneda, H. Yokoyama, Y. Ogawa, and M. Nakazawa, "Linewidth and RIN measurements of longitudinal modes in ultrahigh-speed mode-locked laser diodes," International Conference on Ultrafast Phenomena (UP 2004), TuE39, July (2004).

[141] T. Hirooka, S. Ono, K. Hagiuda, and M. Nakazawa, "Stimulated Brillouin scattering in ultrahigh-speed femtosecond soliton compression with a dispersion-decreasing fiber," International Conference on Ultrafast Phenomena (UP 2004), TuE38, July (2004).

[140] M. Yoshida, T. Yaguchi, S. Harada, and M. Nakazawa, "Optimization of a 40 GHz regeneratively and harmonically mode-locked fiber laser under PLL operation and its longitudinal mode characteristics," Ultrafast Phenomena 2004, ME36, July (2004).

[139]M. Nakazawa, "Ultrafast optical pulses and solitons for advanced communications," Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim 2003), Invited paper, TU3G-6-1, Taipei, Taiwan, December 15-19 (2003).

[138]M. Nakazawa, T. Hirooka, F. Futami, and S. Watanabe, "Ideal distortion-free transmission using optical Fourier transformation and transform-limited ultrashort pulses," European Conference on Optical Communication (ECOC 2003), Post-deadline paper, Th4.3.8, Rimini, Italy, September 21-25 (2003).

[137]M. Nakazawa, "Ultrahigh speed optical transmission using femtosecond pulses and emerging new technology," Europe-U.S.-Japan Symposium on Ultrafast Photonic Technology, Chiba, Japan, July 15 (2003).

[136] M. Nakazawa, "Recent progress on photonic crystal fibers," 3rd Chitose International Forum on Photonics Science & Technology, Invited paper, IV-5, Chitose, Japan, October 6-8 (2002).

[135] M. Nakazawa, "Ultrafast optical TDM transmission with the use of novel nonlinear optical fiber devices," Nonlinear Guided Waves and Their Applications (NLGW 2002), Invited paper, NLTuC1, Stresa, Italy, September 1-4 (2002).

[134] M. Nakazawa, "Ultrafast optical TDM transmission with the use of femtosecond pulses," Nonlinear Optics (NLO 2002), Invited paper, TuA2, Hawaii, July 29-August 2 (2002).

[133] M. Yoshida, S. Choi, and M. Nakazawa, "Longitudinal linewidth measurement of 10 GHz, picosecond mode-locked erbium-doped fiber lasers using a heterodyne detection method," FST 2002, FC-3, Tsukuba, Japan, June 27-28 (2002).

[132] M. Nakazawa, "1 Tb/s OTDM technology," ECOC 2001, Invited paper, Amsterdam, September 30 - October 4 (2001).

[131] M. Nakazawa and K. Suzuki, "A cesium optical atomic clock using a low phase noise regeneratively mode-locked fiber laser," Asia Pacific RASC 2001, Invited paper, A3-1-01, Tokyo, Japan, August 1-4 (2001).

[130] K. R. Tamura and M. Nakazawa, "Pedestal-free transform-limited femtosecond pulse generation at 10 GHz using a polarization maintaining dispersion decreasing fiber and dispersion imbalanced nonlinear loop mirror," CLEO/Pacific Rim 2001, ThJ1-3, Chiba, Japan, July 15-19 (2001).

[129] M. Nakazawa, T. Yamamoto, and K. Tamura, "Ultrahigh speed OTDM transmission using femtosecond Pulses," CLEO/Pacific Rim 2001, Invited paper, TuJ4-3, Chiba, Japan, July 15-19 (2001).

[128] M. Nakazawa, "Single-channel 1.28 terabit/s OTDM transmission using a femtosecond pulse train," FST 2001, Invited paper, FA-1, Tsukuba, Japan, June 28-29 (2001).

[127] M. Yoshida, M. Fujimoto, M. Nakazawa, and H. Ito, "A mode-locked frequency-shifted feedback fiber laser," CLEO 2001, CWA50, Baltimore, May 6-11 (2001).

[126] H. Kubota, K. Suzuki, and S. Kawanishi, M. Nakazawa, M. Tanaka and M. Fujita, "Low-loss, 2 km-long photonic crystal fiber with zero GVD in the near IR suitable for picosecond pulse propagation at the 800 nm band," CLEO 2001, Post deadline paper, CPD3-1, Baltimore, May 6-11 (2001).

[125] S. Kawanishi, T. Yamamoto, and M. Nakazawa, "High sensitivity waveform measurement of 160 Gbit/s single with optical sampling using quasi-phasematched mixing in LiNbO3 waveguide," OFC 2001, WY6, Anaheim, March 17-22 (2001).

[124] T. Yamamoto and M. Nakazawa, "Third- and fourth-order active dispersion compensation using a phase modulator in a terabit/s OTDM transmission," OFC 2001, WH6, Anaheim, March 17-22 (2001).

[123] A. Sahara, T. Komukai, E. Yamada, and M. Nakazawa, "40 Gbit/s return-to-zero transmission over 500 km of standard fiber using chirped fiber Bragg gratings with small group delay ripples," OFC 2001, ThF5, Anaheim, March 17-22 (2001).

[122] K. Suzuki, H. Kubota, and M. Nakazawa, "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," OFC 2001, TuN7, Anaheim, March 17-22 (2001).

[121] K. R. Tamura, Y. Inoue, K. Sato, T. Komukai, A. Sugita, and M. Nakazawa, "32 Wavelength Tunable Mode-locked laser with 100 GHz channel spacing using an arrayed waveguide grating," OFC 2001, TuJ5, Anaheim, March 17-22 (2001).

[120] M. Nakazawa, T. Yamamoto, and K. R. Tamura, "Toward a Terabit/sec single-channel OTDM transmission," MWE 2000, Invited talk, WS10-5, Yokohama, Japan, December 12-14 (2000).

[119] K. Suzuki, H. Kubota, and M. Nakazawa, "640 Gb/s (40 Gb/s x 16 channel)-1,000 km dense WDM dispersion-managed soliton transmission," ROSC 2000, 11-03, Hakone, Japan, October 10-11 (2000).

[118] A. Sahara, H. Kubota, and M. Nakazawa, "The tolerance of the strength of dispersion map in the dispersion managed soliton system with the synchronous modulation", ROSC 2000, 11-01, Hakone, Japan, October 10-11 (2000).

[117] M. Nakazawa, T. Yamamoto, K. R. Tamura, "1.28 Tbit/s - 70 km OTDM transmission using third- and fourth-order simultaneous dispersion compensation with a phase modulator," ECOC 2000, Post deadline paper, 2.6, Munich, Germany, September 3-7 (2000).

[116] T. Inui, T. Komukai and M. Nakazawa, "A wavelength tunable dispersion equalizqer using a nonlinearly chirped fiber Bragg grating pair mounted on multi-layer piezoelectric transducers," OECC 2000, 14C4-3, Chiba, Japan, July 10-14 (2000).

[115] S. Suzuki, Y. Kokubun, M. Nakazawa, T. Yamamoto, S. T. Chu, "Ultra-short pulse transmission characteristics of a vertically coupled microring resonator Add/Drop filter," OECC 2000, 14B2-3, Chiba, Japan, July 10-14 (2000).

[114] M. Nakazawa, "Large capacity soliton transmission using optical TDM technology," OECC 2000, Invited paper, 13A2-1, Chiba, Japan, July 10-14 (2000).

[113] H. Kubota, K. Tamura, and M. Nakazawa" Handling noise in supercontinuum generation for WDM application", ROSC'99, Invited paper 12-06, Kyoto, Japan, November 9-12 (1999).

[112] M. Nakazawa, H. Kubota, K. Suzuki, E. Yamada, and A. Sahara, "80 Gbit/s multi-channel soliton transmission over transoceanic distances" ROSC'99, Invited Paper 9-02, Kyoto, Japan, November 9-12 (1999).

[111] H. Kubota and M. Nakazawa, "Recent progress in soliton communication technology", NOLTA '99 (International Symposium on Nonlinear Theory and its Applications), Invited paper, No. 1-B-1, Hawaii, November 28-December 2(1999).

[110] K. Tamura, T. Komukai, and M. Nakazawa, "A new optical routing technique with a subcarrier clock controlled wavelength converter" ECOC'99 (European Conference on Optical Communication), II 126-127, Nice, France, September 26-30 (1999).

[109] T. Yamamoto, E. Yoshida, K. Tamura, and M. Nakazawa, "Single channel 640 Gbit/s TDM transmission over 100 km", ECOC'99 (European Conference on Optical Communication), II 38-39, Nice, France, September 26-30 (1999).

[108] M. Nakazawa, "Handing noise in soliton systems for ultrahigh speed transmission over unlimited distances" OAA'99, Invited paper, WB4, Nara, Japan, June 6-11 (1999).

[107] H. Kubota, K. Tamura, and M. Nakazawa, "Coherence degradation of a high-order optical soliton train in the presence of noise", OAA'99, ThD6, Nara, Japan, June 6-11 (1999).

[106] E. Yamada, T. Imai, T. Komukai, and M. Nakazawa, "10 Gbit/s soliton transmission over 2,9000 km using 1.3 m single-mode fibers and dispersion compensation using chirped fiber Bragg gratings" OAA'99, ThD7, Nara, Japan, June 6-11 (1999).

[105] K. Tamura and M. Nakazawa, "Pedestal-free pulse compressor for high repetition rate, broadly tunable femtosecond pulses" OAA'99 (Optical Amplifier and their Applications), FA5, Nara, Japan, June 6-11 (1999).

[104] M. Nakazawa, "Ultrahigh speed soliton and non-soliton technologies", UEO '99 (Ultrafast Electronics and Optelectronics), Invited paper, UThA1, Aspen, Colorado, April 12-16 (1999).

[103] M. Nakazawa," Toward terabit/s single-channel transmission," OFC'99, FI1, San Diego, Invited paper, February 21-26(1999).

[102] A. Sahara, H. Kubota, and M. Nakazawa," Ultrahigh speed soliton transmission in the presence of polarization mode dispersion using in-line synchronous modulation," OFC'99, WC3, San Diego, February 21-26 (1999).

[101] A. Sahara, K. Suzuki, H. Kubota, T. Komukai, and M. Nakazawa," 40 Gbit/s soliton transmission field experiment over 1020 km and its extension to 1360 km using in-line synchronous modulation," OFC'99, ThI1, San Diego, February 21-26 (1999).

[100] T. Imai, T. Komukai, and M. Nakazawa," The second and third order dispersion compensation of picosecond pulses achieved by combining two nonlinearly chirped fiber Bragg gratings," OFC'99, FA6, San Diego, February 21-26 (1999).

[99] M. Nakazawa, A. Sahara, H. Kubota, and K. Suzuki," Ultrahigh speed soliton transmission beyond polarization mode dispersion using in-line synchronous modulation," International workshop on soliton, ROSC'98 Invited paper, Kyoto, November 10-11 (1998).

[98] K. Tamura, E. Yoshida, M. Nakazawa," Mode-locked fiber lasers for optical communications," OECC'98, Makuhari, Japan, Invited paper, 16C1-1, July(1998).

[97] M. Nakazawa," Ultrafast fiber lasers and their applications to optical communication," International Workshop on Current Topics of Laser Technology, Kobe, Japan, Invited paper, pp. 17-18, March(1998).

[96] M. Nakazawa, E. Yoshida, T. Yamamoto, E. Yamada, and A. Sahara," 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," OFC'98, PD14, San Jose, U. S. A., February (1998).

[95] K. Suzuki, H. Kubota, A. Sahara, and M. Nakazawa," 40 Gbit/s single-channel optical soliton transmission over 70,000 km using in-line synchronous modulation," OFC'98, ThI4, San Jose, U. S. A., February (1998).

[94] T. Komukai and M. Nakazawa, "Fabrication of nonlinearly chirped fiber Bragg gratings for high order dispersion compensation," OFC'98, TuM2, San Jose, U. S. A., February (1998).

[93] H. Kubota and M. Nakazawa, "Advantages of dispersion-allocated soliton transmission and its application to conventional 1.3 μm single-mode fiber," International Symposium NOLTA'98, Invited paper, M3F, Hawaii, U. S. A., December (1997).

[92] M. Nakazawa, H. Kubota, K. Suzuki, E. Yamada, and A. Sahara, "Superb characteristics of Dispersion-allocated soliton transmission in TDM and WDM systems," International l Soliton symposium on optical soliton, Kyoto, Japan, pp. 197-224, Invited paper, November (1997).

[91] M. Nakazawa, K. Suzuki, H. Kubota, A. Sahara, and E. Yamada," 160 Gbit/s WDM (20 Gbit/sx8 channels) soliton transmission over 10,000 km using in-line synchronous modulation and optical filtering," OA&A'97, Victoria, Canada, PDP-10, July (1997).

[90] E. Yoshida and M. Nakazawa,"Low Threshold, 115 GHz continuous wave modulational instability erbium-doped fiber laser," OECC'97 (OptoElectronics and Communication Conference'97), PDP2-1, Seoul, Korea, July (1997).

[89] M. Nakazawa," Optical soliton and nonlinear transmission systems," OECC'97 (OptoElectronics and Communication Conference'97), 9A3-1 Invited Paper, Seoul, Korea, July (1997).

[88] M. Nakazawa, K. Suzuki, H. Kubota, A. Sahara, E. Yamada,"100 Gbit/s (20 Gbit/sx5 channels) soliton transmission over 10,000 km using in-line synchronous modulation and optical filtering," OFC'97, PDP 21, Dallas, February (1997).

[87] M. Nakazawa, "Dispersion-allocated soliton technology and the stretched-pulse mode-locked fiber laser," OFC'97 (Conference on Optical Fiber Communciation), Invited paper, Dallas, February 17 (1997).

[86] M. Nakazawa," Recent progress in optical soliton communication," International Symposium on Solitons, Invited paper, Shounan Kokusai Villege, Shounan, Kanagawa, December 4 (1996).

[85] E. Yoshida and M. Nakazawa," Ultra-high speed mode-locked fiber lasers in the pico-femtosecond region," ROSC '96, Invited paper, Kyoto, November 26 (1996).

[84] M. Nakazawa, K. Suzuki, H. Kubota, A. Sahara, and E. Yamada," 60 Gbit/s WDM soliton transmission over 10,000 km using in-line synchronous modulation and optical filtering," ROSC '96 (Research Organization on Soliton Communication) Invited paper, Kyoto, November 26 (1996).

[83] M. Nakazawa, H. Kubota, and A. Sahara,"Dispersion-allocated soliton transmission," 2nd International Workshop for Soliton Communication, Invited paper, Hakone, Japan, August 26 (1996).

[82] M. Nakazawa, K. Suzuki, H. Kubota, and E. Yamada," 60 Gbit/s WDM (20 Gbit/sx3 unequally-spaced channels) soliton transmission over 10,000 km," OA&A'96, Monterey, CA, July, (1996).

[81] M. Nakazawa and E. Yoshida," A 200 GHz erbium-doped fiber laser using a rational harmonic mode-locking technique," CLEO'96, Anaheim, CA, U. S. A., June, (1996).

[80] T. Yamamoto and M. Nakazawa," Optical demultiplexing and routing of 2.5 Gbit/sx4 TDM signal by using four-wave mixing and a novel wavelength router with optical circulator and fiber gratings," Conf. On optical Soliton Communication, Tokyo, Japan, June, (1996).

[79] H. Kubota and M. Nakazawa, "Recent progress in soliton communication", International Symposium on Nonlinear Theory and its Application, NOLTA '95,G-4, Invited paper, Las Vegas, Nevada, U.S.A., Dec., (1995).

[78] K. Suzuki and M. Nakazawa, "80-160 Gbit/s ultrahigh Speed Soliton Transmission and Related Soliton Technology", 20th Australian Conference on Optical Fibre Technology, ACOFT'95, Invited paper, pp. 347-350, Coolum Beach, Queensland, Australia, Dec., (1995).

[77] H. Kubota and M. Nakazawa, "A dispersion-allocated soliton and its impact on soliton communication", International Symposium on Physics and Applications of Optical Solitons in Fibers, 14A-3, Invited paper, Kyoto, Japan, Nov., (1995).

[76] E. Yoshida and M. Nakazawa, "Recent progress in femtosecond fiber lasers", 9th international symposium on ultrafast processes in spectroscopy, UPS'95, MC3, Invited paper, Trieste, Italy, Nov., (1995)

[75] T. Komukai and M. Nakazawa, "Efficient Fiber Gratings Formed on High NA Dispersion-Shifted Fibers", 21st European Conference on Optical Communication, ECOC'95, Mo.A.3.3, Brussels, Belgium, Sept., (1995).

[74] M. Nakazawa and K. Suzuki,"10 Gb/s pseudorandom dark soliton transmission over 1200 km using new coding and detection schemes with supression of stimulated Brillouin scattering," 10th International Conference on Integrated Optics and Optical Fibre Communication, IOOC'95, PD2-2, Hong Kong, Jun., (1995).

[73] M. Nakazawa et al.,"Field demonstration of soliton transmission at 10 Gb/s over 2,500 km and 20 Gb/s over 1000 km in the Tokyo metropolitan optical network," 10th International Conference on Integrated Optics and Optical Fibre Communication, IOOC'95, PD2-1, Hong Kong, Jun., (1995).

[72] E. Yoshida, Y. Kimura and M. Nakazawa, "Generation of femtosecond pulse train at 20 GHz using an erbium-doped fibre laser and a dispersion-decreasing erbium-doped fibre amplifier", 10th International Conference on Integrated Optics and Optical Fibre Communication, IOOC'95, ThA1-1, Hong Kong, June, (1995).

[71] T. Yamamoto, T. Imai, T. Komukai, Y. Miyajima, and M. Nakazawa, "Optical demultiplexing and routing of TDM signal by using four-wave mixing and a novel wavelength router with optical circulators and fiber gratings", 10th International Conference on Integrated Optics and Optical Fibre Communication, IOOC'95, WB3-2, Hong Kong, Jun., (1995).

[70] M. Nakazawa,"Ultrahigh Speed optical soliton communication and related technology," 10th International Conference on Integrated Optics and Optical Fibre Communication, IOOC'95, Invited paper, FD2-1, Hong Kong, Jun., (1995).

[69] T. Sugawa, K. Kurokawa, H. Kubota, and M. Nakazawa, "Polarization dependence of soliton interactions and soliton self-frequency shift in a femtosecond soliton transmission", Conference on Optical Fiber Communication, OFC'95, FB1, San Diego, Calfornia, U.S.A., Mar., (1995).

[68] E. Yamada, K. Suzuki, and M. Nakazawa, "Subpicosecond optical demultiplexing at 10 GHz with a zero-dispersion, dispersion-flattened, nonlinear fiber-loop mirror controlled by a 500-fs gain-switched laser diode", Conference on Optical Fiber Communication, OFC'95, ThL5, San Diego, Calfornia, U.S.A., Mar., (1995).

[67] M. Nakazawa, E. Yoshida, E. Yamada, K. Suzuki, T. Kitoh, and M. Kawachi, "Single-polarization 80 Gbit/s soliton data transmission over 500 km with unequal amplitude solitons for timing clock extraction", 20th European Conference on Optical Communication, ECOC'94, postdeadline paper, pp. 41-44, Firenze, Italy, Sep., (1994).

[66] Y. Kimura and M. Nakazawa, "Gain and Noise Characteristics of a 48 km-Long, Dispersion-Shifted, Distributed Erbium-Doped Fiber Amplifier with High Power Transmission Signals", 20th European Conference on Optical Communication, ECOC'94, pp. 963-967, Firenze, Italy, Sep., (1994).

[65] M. Nakazawa, "Recent progress in optical soliton communication", Optical Amplifiers and their Applications, OA&A'94, ThC1-1, Breckenridge, Colorado, U.S.A., Aug., (1994).

[64] M. Nakazawa, K. Suzuki, H. Kubota, E. Yamada, and Y. Kimura, "20 Gbit/s-3000 km Straight-Line Soliton Transmission Beyond Gordon-Haus Limit", 5th Optoelectronics Conference, OEC'94, postdeadline paper, PDI-3, Makuhari, Chiba, Japan, Jul., (1994).

[63] E. Yoshida, Y. Kimura, and M. Nakazawa, "52 Femtosecond Pulse Generation using an Erbium-Doped Fiber Laser with a Pulse Compression Technique", 5th Optoelectronics Conference, OEC'94, 13B1-2, Makuhari, Chiba, Japan, Jul., (1994).

[62] H. Kubota and M. Nakazawa, "Possibility of sub-Terabit soliton transmission using soliton control," Optical Fiber Communication, OFC'94, WM1, San Jose, U. S. A., Feb., (1994).

[61] M. Nakazawa, "Ultra-high Speed Optical Soliton Communication," International Workshop on Femtosecond Technology, FST'94, Invited Paper, Tsukuba, Japan, Feb., (1994).

[60] H. Kubota and M. Nakazawa, "High-speed optical soliton communication using erbium-doped fiber amplifier and soliton transmission control," 1993 International Symposium on Nonlinear Theory and its Applications, NOLTA'93, 7.8, Honolulu, U. S. A., Dec., (1993).

[59] M. Nakazawa, "Optical soliton transmission Technology," IEEE Lasers and Electro-Optics Society 1993 Annual Meeting, LEOS'93, Invited paper, OC6.1, San Jose, U. S. A., Nov., (1993).

[58] M. Nakazawa, "Ultrahigh-speed optical soliton communication and soliton transmission control," Nonlinear Guided-wave phenomena, Invited Paper, TuA1, Cambridge, England, Sep., (1993).

[57] K. Kurokawa, H. Kubota, and M. Nakazawa, "Femtosecond soliton interaction with adiabatic soliton narrowing in a distributed erbium-doped fiber amplifier," Optical Amplifiers and Their Applications, OA&A'93, TuB4, Yokohama, Japan, Jul., (1993).

[56] T. Sugawa, E. Yoshida, Y. Miyajima, and M. Nakazawa, "1.6-ps pulse generation from a 1.3-μm Pr3+-doped fluoride fiber laser," Optical Amplifiers and Their Applications, OA&A'93, TuA6, Yokohama, Japan, Jul., (1993).

[55] E. Yamada, K. Wakita, and M. Nakazawa, "20-30 GHz pulse train generation from a MQW electro-absorption intensity modulator," Optical Amplifiers and Their Applications, OA&A'93, MD7, Yokohama, Japan, Jul., (1993).

[54] M. Nakazawa, K. Suzuki, E. Yamada, H. Kubota, and Y. Kimura, "Straight-line soliton data transmissions at 20 Gbit/s-2000 km and 40 Gbit/s-1000 km using erbium-doped fiber amplifiers," Optical Amplifiers and Their Applications, OA&A'93, Postdeadline paper, PD2, Yokohama, Japan, Jul., (1993).

[53] M. Nakazawa, "Ultrahigh-speed optical soliton communication and new aspects of soliton transmission technology," Optical Fiber Communication, OFC'93, Invited Paper, WC1, San Jose, U. S. A. (1993).

[52] M. Nakazawa, "Recent Progress on soliton transmission systems," OptoElectronics Conference, OEC'92, Invited Paper, 15A2-2, Makuhari, Japan (1992).

[51] E. Yamada, K. Suzuki, M. Nakazawa, " 10 Gbit/s penalty-free soliton data transmission over 1200 km," OptoElectronics Conference, OEC'92, 16A4-4, Makuhari, Japan (1992).

[50] M. Nakazawa, "Ultralong distance soliton transmission," Conference on Lasers and ElectroOptics, CLEO'92, Invited Paper, CWI1, Anaheim, U. S. A. (1992).

[49] M. Nakazawa, K. Suzuki, and E. Yamada, "20 Gbit/s-1020 km penalty-free soliton data transmission using erbium-doped fiber amplifiers," Conference on Lasers and ElectroOptics, CLEO'92, Postdeadline Paper, CPD29, Anaheim, U. S. A. (1992).

[48] M. Nakazawa, "Erbium-doped fibre amplifiers in femtosecond pulse generation and long-distance soliton communication," Mini-Symposium on Fibre Amplifiers for Communications, The Rank Prize Funds, Invited Paper, Grasmere, U. K. April (1992).

[47] M. Nakazawa, "Recent progress on optical soliton communication and future prospects," Optical Fiber Communication, OFC'92, Invited Paper, WC1, San Jose, U. S. A. (1992).

[46] H. Kubota and M. Nakazawa, "Soliton transmission control in the time domain, "Optical Fiber Communication, OFC'92, WC2, San Jose, U. S. A. (1992).

[45] M. Nakazawa, K. Suzuki, E. Yamada, H. Kubota, and Y. Kimura, "10 Gbit/s-1200 km single-pass soliton data transmission using erbium-doped fiber amplifiers," Optical Fiber Communication, OFC'92, Postdeadline Paper, PD11, San Jose, U. S. A. (1992).

[44] M. Nakazawa, "Erbium-doped fiber amplifiers for ultrashort pulse generation and optical soliton communication," Optical Society of America Annual Meeting, Invited paper, MT3, San Jose, U. S. A. (1991)

[43] M. Nakazawa, Y. Kimura, K. Suzuki, K. Kurokawa, and H. Kubota, "Self-induced transparency soliton propagation in an erbium-doped optical fiber waveguide," Optical Society of America Annual Meeting, Postdeadline paper, PD11, San Jose, U. S. A. (1991).

[42] M. Nakazawa, "Optical soliton communication using erbium-doped fibre amplifiers," European Conference on Optical Communication, ECOC/IOOC'91, Invited Paper Th. C 10.1, Paris, France (1991).

[41] M. Nakazawa, E. Yamada, and Y. Kimura, "Repetition rate control of an LD-pumped femtosecond erbium-doped fiber laser using a sub ring cavity," Nonlinear Guided-Wave Phenomena, PDP-9, Cambridge U. K. (1991)

[40] Y. Kimura and M. Nakazawa, "Gain characteristics of Lanthanum co-doped erbium fiber amplifier, " Optical Amplifiers and Their Applications, OA&A'91, WD5, Snowmass, U. S. A. (1991).

[39] M. Nakazawa, "Dynamic soliton communication," Optical Fiber Communication, OFC'91, Invited Paper, ThL1, San Diego, U. S. A. (1991).

[38] H. Kubota, M. Nakazawa, and K. Kurokawa, "Femtosecond optical pulse transmission over long distances using adiabatic soliton trapping and soliton standardization," Optical Fiber Communication, OFC'91, TuK1, San Diego, U. S. A. (1991).

[37] M. Nakazawa, "The dawn of optical soliton communication," Mini-Symposium on Nonlinear optical Fibre Pulse Processing, The Rank Prize Funds, Invited Paper WE-14, Grasmere, U. K. September (1990).

[36] M. Nakazawa, "Optical soliton transmission and femtosecond pulse technology," NTT International Symposium'90, Tokyo, Japan, pp. 119-133, November (1990).

[35] M. Nakazawa, "Optical soliton communication, " The Second International Forum on the Frontier of Telecommunications Technology, Session 1-7, Tokyo, Japan, October (1990).

[34] K. Kurokawa and M. Nakazawa, "Femtosecond pulse generation in the 1300-1600 nm region and application to optical communication," 16th European Conference on optical Communication ECOC'90, MoB3.1, Amsterdam, The Netherland (1990).

[33] Y. Kimura, K. Suzuki, and M. Nakazawa, "High gain erbium-doped fiber amplifier pumped in the 0.8 μm pump band," 16th European Conference on optical Communication ECOC'90, MoG4.4, Amsterdam, The Netherland (1990).

[32] M. Nakazawa, Y. Kimura, and K. Suzuki, "Soliton transmission in a distributed, dispersion-shifted erbium-doped fiber amplifier," Optical Amplifiers and Their Applications, OA&A'90, TuA7, Monterey, U. S. A. (1990).

[31] K. Suzuki, Y. Kimura, M. Nakazawa, " High gain erbium-doped fiber amplifier pumped by 820 nm GaAlAs laser diode," Optical Amplifiers and Their Applications, OA&A'90, MB4, Monterey, U. S. A. (1990).

[30] M. Nakazawa, Y. Kimura, and K. Suzuki, "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," Optical Amplifiers and Their Applications, OA&A'90, Post Deadline Paper PDP1, Monterey, U. S

[29] M. Nakazawa, "Propagation and amplification of ultrashort optical soliton pulses in erbium-doped fibers for very high speed communication," Topical Meeting on Ultrafast Phenomena, ICUP'90, Invited Paper ThA2-1, Monterey, U. S. A. (1990).

[28] M. Nakazawa and Y. Kimura, "Amplification and transmission at l.53-l.55 μm with Er3+-doped fibers," Optical Fiber Communication, OFC'90, Invited Paper, FA5, San Francisco, U. S. A. (l990).

[27] M. Nakazawa, K. Suzuki, E. Yamada, and Y. Kimura, "Distortion-free single-pass soliton communication over 250 km using multiple Er3+-doped optical repeaters," OFC'90, post deadline paper, PD5, San Francisco, U. S. A. (l990).

[26] M. Nakazawa, "Erbium-doped fiber amplifier and its application to nonlinear optics," SPIE, vol.ll7l, Invited Paper, Boston, Massachusetts, U. S. A. (l989).

[25] M. Nakazawa, "Femtosecond fiber Raman soliton and related technique, "International conference on Integrated Optics and Optical Fiber Communication, IOOC'89, l8A2-l, Invited Paper, Kobe, Japan (l989).

[24] M. Nakazawa, K. Suzuki, and Y. Kimura, "Wavelength multiple soliton amplification and transmission with Er3+-doped optical fiber repeater," IOOC'89, 20A4-l, Kobe, Japan (l989).

[23] Y. Kimura, K. Suzuki, and M. Nakazawa, "Gain dynamics of an Er3+-doped fiber amplifier," IOOC'89, 20A4-6, Kobe, Japan (l989).

[22] K. Suzuki, Y. Kimura, and M. Nakazawa, "Optical soliton amplification and transmission by stimulated Raman scattering pumped by InGaAsP laser diode," IOOC'89, 2lC4-4, Kobe, Japan (l989).

[21] K. Suzuki, Y. Kimura, and M. Nakazawa, "Subpicosecond soliton amplification and transmission using Er3+-doped fiber pumped by InGaAsP laser diodes," IOOC'89, post deadline paper, 20 PDA-2, Kobe, Japan (l989).

[20] M. Nakazawa, "Erbium-doped optical fiber amplifier, "Workshop on Optical Amplification for Communications, in conjunction with IOOC'89, Invited Paper, Kobe, Japan (l989).

[19] M. Nakazawa, K. Suzuki, and Y. Kimura, "20 Gb/s soliton amplification and transmission with an Er3+-doped fiber," IOOC'89, post deadline paper, 20PDA-3, Kobe, Japan (l989).

[18] K. Suzuki, M. Nakazawa, and H. A. Haus, "Parametric soliton laser," Conference on Lasers and ElectroOptics, CLEO'89, FA4, Baltimore, U. S. A. (l989).

[17] Y. Kimura, K. Suzuki, and M. Nakazawa, "Efficient Er3+-doped optical fiber amplifier pumped by a l.48 μm high-power laser diode," Optical Fiber Communication, OFC'89, TUG6, Houston, U. S. A. (l989).

[16] Y. Kimura and M. Nakazawa, "Mode competition between 0.9- and l.08 μm laser transition in a Nd3+-doped fiber laser," Optical Fiber Communication, OFC'89, TUG8, Houston, U. S. A. (l989).

[15] M. Nakazawa, Y. Kimura, and K. Suzuki, "Soliton amplification and transmission with Er3+-doped fiber repeater pumped by InGaAsP laser diode," Optical Fiber Communication, OFC'89, post deadline paper, PD02, Houston, U. S. A., (l989).

[14] K. Hagimoto, M. Nakazawa, et. al., "A 2l2-km non-repeated transmission experiment at l.8 Gb/s using LD pumped Er3+-doped fiber amplifiers in an IM/DD repeater systems," Optical Fiber Communication, OFC'89, post deadline paper, PD l5, Houston, U. S. A. (l989).

[13] M. Nakazawa and H. A. Haus, "The modulational instability laser," Nonlinear Guided-Wave Phenomenon: Physics and Applications, Invited paper, FAl-l, Houston, U. S. A. (l989).

[12]M. Nakazawa, " The soliton laser," l3th European workshop on Optical Waveguide Theory, Invited paper, Arundel, England, (l988).

[11] M. Nakazawa, K. Suzuki, H. Nakano, and H. A. Haus, " Frequency tuning characteristics of fiber Raman soliton laser, " International Quantum Electronics Conference, IQEC'88, ThE-5, Tokyo, Japan (l988).

[10] K. Suzuki and M. Nakazawa, " Raman amplification in P2O5 doped silica fibers," IQEC'88, MP-43, Tokyo, Japan (l988).

[9] Y. Kimura and M. Nakazawa, "Multi-wavelength laser oscillations in a Nd3+ and Er3+ doubly doped fiber laser," IQEC'88, WK-7, Tokyo, Japan (l988).

[8] M. Nakazawa, H. Kubota, and K. Kurokawa, " Generation of 29-femtosecond pulses from a synchronously pumped dye laser and its cavity damping technique," Sixth International Conference on Ultrafast Phenomena, ICUP'88, TUC3-l, Kyoto, Japan (l988).

[7] M. Nakazawa, " Optical time domain reflectometors in single-mode optical fibers," XXIInd General Assembly of the International Union of Radio-Science, URSI, Invited Paper, Tel Aviv, Israel (l987).

[6] M. Nakazawa and E. P. Ippen, " Theory of the synchronously pumped fiber Raman laser," CLEO'86, MH4, San Francisco, U. S. A. (l986).

[5] M. Nakazawa, " Raman amplification for silica fiber, "CLEO'84, Invited Paper, FR2, Anaheim, U. S. A. (l984).

[4] M. Nakazawa and M. Tokuda, " l30 km fault location at l.55 μm by using Er glass laser," CLEO'84, WH2, Anaheim, U. S. A. (l984).

[3] T. Horiguchi, M. Nakazawa, and M. Tokuda, "Acoustooptical switch for fault location," IOOC'83, 30B3-3, Tokyo, Japan (l983).

[2] M. Nakazawa, M. Tokuda, and N. Uchida, " Lasing characteristics of a new type of laser with an ultralong optical fiber resonator," IOOC'83, 29D3-l6, Tokyo, Japan (l983).

[1] M. Nakazawa, M. Tokuda, and N. Uchida, "Long distance fault location system for single-mode and multi-mode fibers with l.32 μm YAG laser," CLEO'82, Invited paper, WL4, Anaheim, U. S. A. (l982).