Masataka Nakazawa

Publication Activity (10 Years)

Years Active: 1986-2024
Publications (10 Years): 53

Top Topics

Wireless Transmission

Rapidly Changing

Top Venues

IEICE Electron. Express

Publications

Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka
Mode Division Multiplexed Coherent Optical Transmission in Time Domain by Using Higher-order Hermite-Gaussian Pulses. OFC (2024)
Masato Yoshida, Takaaki Hirai, Shohei Beppu, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa, Yuta Wakayama, Noboru Yoshikane
New GAWBS Noise Interacting with Longitudinally Propagating Acoustic Waves in Few-mode Fibers. OFC (2024)
Masato Yoshida, Kosuke Kimura, Toshihiko Hirooka, Keisuke Kasai, Masataka Nakazawa
Demodulation Performance Comparison of High-Speed Coherent Nyquist Pulse Signal with Analog and Digital Demultiplexing Schemes. IEICE Trans. Commun. 106 (11) (2023)
Yuto Kobayashi, Takahiro Suganuma, Tetsuya Hayashi, Takemi Hasegawa, Masato Yoshida, Masataka Nakazawa
Characterization of Inter-core Crosstalk of Multi-core Fiber as a Function of Bending Radius with Multi-channel OTDR. OECC/PSC (2022)
Aoi Watanabe, Aoto Ishikawa, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa
10.2 Tbit/s (1.28 Tbit/s/ch x 8 ch) WDM Nyquist Pulse Transmission over 2100 km. OECC/PSC (2022)
Masato Yoshida, Masataka Nakazawa
GAWBS noise in multicore fibers. OECC/PSC (2022)
Masato Yoshida, Kosuke Kimura, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa
Demodulation Performance Comparison of 160 Gbaud Coherent Nyquist Pulse Signal with Analog and Digital DEMUX Schemes. OECC/PSC (2022)
Kosuke Kimura, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa
Experimental and Numerical Analysis of Ultrahigh-Speed Coherent Nyquist Pulse Transmission with Low-Nonlinearity Dispersion Compensator. IEICE Trans. Commun. (9) (2022)
Masato Yoshida, Kozo Sato, Toshihiko Hirooka, Keisuke Kasai, Masataka Nakazawa
Precise Measurements and their Analysis of GAWBS-Induced Depolarization Noise in Multi-Core Fiber for Digital Coherent Transmission. IEICE Trans. Commun. (2) (2022)
Keisuke Kasai, Taisei Sato, Toshihiko Hirooka, Masato Yoshida, Masataka 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)
Takashi Kan, Keisuke Kasai, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa
Broadband Dynamic Injection-Locking Performance of Fabry-Perot LD and Its Application to Coherent Homodyne Receiver. OFC (2021)
Kozo Sato, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa
GAWBS Noise Correlation Between Cores in Four-Core Fiber. OFC (2021)
Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka
Recent progress and challenges toward ultrahigh-speed transmission beyond 10 Tbit/s with optical Nyquist pulses. IEICE Electron. Express 18 (7) (2021)
Takahide Murakami, Yoji Kishi, Koji Ishibashi, Keisuke Kasai, Hiroyuki Shinbo, Morihiko Tamai, Kensuke Tsuda, Masataka Nakazawa, Yu Tsukamoto, Hiroyuki Yokoyama, Yoshimi Fujii, Yuta Seki, Shinobu Nanba, Takanori Hara, Fumiyuki Adachi, Takayuki Sotoyama
Research Project to Realize Various High-reliability Communications in Advanced 5G Network. WCNC (2020)
Keisuke Kasai, Masataka 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)
Masato Yoshida, Takashi Kan, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa
10 Tbit/s QAM Quantum Noise Stream Cipher Coherent Transmission over 160 km. OFC (2020)
Keisuke Kasai, Toshihiko Hirooka, Masato Yoshida, Masataka 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)
Naoya Takefushi, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa
Experimental and Theoretical Analyses of GAWBS Phase Noise in Multi-Core Fiber for Digital Coherent Transmission. OFC (2020)
Morihiko Minowa, Hiroyuki Seki, Yukihiko Okumura, Satoshi Suyama, Jun Terada, Satoshi Shigematsu, Yasushi Takatori, Hiroaki Asano, Yukio Hirano, Yasushi Yamao, Fumiyuki Adachi, Masataka Nakazawa
5G R&D Activities for High Capacity Technologies with Ultra High-Density Multi-Band and Multi-Access Layered Cells. VTC Spring (2019)
Naoya Takefushi, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa
GAWBS Noise Characteristics in Digital Coherent Transmission in Various Optical Fibers. OECC/PSC (2019)
Masato Yoshida, Takashi Kan, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa
Real-Time 256 QAM Bi-directional Coherent Transmission in Next Generation Mobile Fronthaul. OECC/PSC (2019)
Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa
Dual-Polarization On-Line 256 and 512 QAM Digital Coherent Transmission. OFC (2019)
Ryoya Hirata, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa
Sub-Picosecond Optical Switch over Entire C-Band by Using Nonlinear Optical Loop Mirror. OECC/PSC (2019)
Ryoya Hirata, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa
Wavelength-tunable sub-picosecond optical switch over entire C-band using nonlinear optical loop mirror. IEICE Electron. Express 16 (23) (2019)
Seiji Okamoto, Masaki Terayama, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa
Experimental and Numerical Comparison of Probabilistically-Shaped 4096 QAM and Uniformly-Shaped 1024 QAM in All-Raman Amplified 160 km Transmission. OFC (2018)
Masataka Nakazawa, Masaki Terayama, Seiji Okamoto, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka
Observation of Guided Acoustic-Wave Brillouin Scattering and its Digital Compensation in Coherent QAM Transmission. OFC (2018)
Keisuke Kasai, Masato Yoshida, Toshihiko Hirooka, Katsumi Iwatsuki, Masataka Nakazawa
Backward-Rayleigh-Scattering Suppressed 160 Gbit/s 256 QAM Injection-Locked Bidirectional Coherent Transmission for Next Generation Mobile Fronthaul. ECOC (2018)
Masaki Terayama, Seiji Okamoto, Keisuke Kasai, Masato Yoshida, Masataka 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)
Keisuke Kasai, Yixin Wang, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa
Injection-locked Homodyne Detection for Higher-order QAM Transmission. OFC (2018)
Toshihiko Hirooka, Ryoya Hirata, Jianping Wang, Masato Yoshida, Masataka Nakazawa
Single-Channel 10.2 Tbit/s PDM-DQPSK Nyquist Pulse Transmission over 300 km. ECOC (2018)
Masataka Nakazawa, Masato Yoshida, Takuya Hirano
Secure Transmission using QAM Quantum Noise Stream Cipher with Continuous Variable QKD. OFC (2018)
Takashi Kan, Keisuke Kasai, Masato Yoshida, Masataka 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)
Masato Yoshida, Junpei Nitta, Kosuke Kimura, Keisuke Kasai, Toshihiko Hirooka, Masataka 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)
Koudai Harako, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa
A 40 GHz, 770 fs regeneratively mode-locked erbium fiber laser operating at 1.6 µm. IEICE Electron. Express 14 (19) (2017)
Jun Yamamoto, Tamotsu Yajima, Yusuke Kinoshita, Futoshi Ishii, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa
Fabrication of multi core fiber by using slurry casting method. OFC (2017)
Keisuke Kasai, Yixin Wang, Masato Yoshida, Toshihiko Hirooka, Katsumi Iwatsuki, Masataka Nakazawa
80 Gbit/s/ch, 256 QAM Digital Coherent Optical Transmission System with Injection-Locking for Next Generation Mobile Fronthaul Network. ECOC (2017)
Kosuke Kimura, Junpei Nitta, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa
A New Optical Phase-Locked System Between Ultrashort Pulses for 640 Gbaud Nyquist OTDM Coherent QAM Transmission. ECOC (2017)
Keisuke Kasai, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa, Masaki Shiraiwa, Yoshinari Awaji, Naoya 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)
Keisuke Kasai, Masataka Nakazawa, Yasunori Tomomatsu, Takashi 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)
Yixin Wang, Keisuke Kasai, Masato Yoshida, Masataka Nakazawa
Single-carrier 216 Gbit/s, 12 Gsymbol/s 512 QAM coherent transmission over 160 km with injection-locked homodyne detection. OFC (2017)
Keisuke Kasai, Masato Yoshida, Masataka 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)
Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa
Fused type fan-out device for multi-core fiber based on bundled structure. OFC (2016)
Tamotsu Yajima, Jun Yamamoto, Yusuke Kinoshita, Futoshi Ishii, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa
Fabrication of OH-free, single-mode fiber by using slurry casting and rod-in-tube method. IEICE Electron. Express 13 (1) (2016)
Masatoshi Nakao, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa
A 1.55 µm, 271 fs and 1.07 µm, 294 fs simultaneously mode-locked Er- and Yb-doped fiber laser with a single SWNT/PVA saturable absorber. IEICE Electron. Express 13 (14) (2016)
Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa
Mode coupling measurement at a splice point between few-mode fibers using a synchronous multi-channel OTDR. OFC (2016)
Toshihiko Hirooka, Keisuke Kasai, Yixin Wang, Masataka Nakazawa, Masaki Shiraiwa, Yoshinari Awaji, Naoya Wada
First demonstration of digital coherent transmission in a deployed ROADM network with a 120 Gbit/s polarization-multiplexed 64 QAM signal. IEICE Electron. Express 12 (23) (2015)
Masato Yoshida, Toshihiko Hirooka, Keisuke Kasai, Masataka Nakazawa
Real-time 10 Gbit/s-16 QAM quantum stream cipher transmission over 320 km with FPGA-based transmitter and receiver. OFC (2015)
Keisuke Kasai, Shohei Beppu, Yixin Wang, Masataka Nakazawa
256 QAM (polarization-multiplexed, 5 Gsymbol/s) coherent transmission with an injection-locked homodyne detection technique. OFC (2015)
Masato Yoshida, Toshihiko Hirooka, Keisuke Kasai, Masataka 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)
David Odeke Otuya, Koudai Harako, Keisuke Kasai, Toshihiko Hirooka, Masataka 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)
Masato Yoshida, Toshihiko Hirooka, Keisuke Kasai, Masataka Nakazawa
QAM quantum noise stream cipher using digital coherent optical transmission. ACSSC (2015)
Masataka Nakazawa
QAM quantum noise stream cipher transmission with extremely high security. ECOC (2015)
Toshikazu Sakano, Tetsuro Komukai, Atsushi Takahara, Toshihiko Hirooka, Masataka Nakazawa
Ad-hoc photonic network based on movable and deployable ICT resource unit to meet rapidly changing service demands. OFC (2015)
Tetsuro Komukai, Hirokazu Kubota, Toshikazu Sakano, Toshihiko Hirooka, Masataka Nakazawa
Plug-and-Play Optical Interconnection Using Digital Coherent Technology for Resilient Network Based on Movable and Deployable ICT Resource Unit. IEICE Trans. Commun. (7) (2014)
Daiki Seya, Koudai Harako, Toshihiko Hirooka, Masataka Nakazawa
All-optical high-performance demultiplexing using optical Nyquist pulse sampling. OFC (2014)
David Odeke Otuya, Koudai Harako, Keisuke Kasai, Toshihiko Hirooka, Masataka 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)
Tamotsu Yajima, Jun Yamamoto, Yusuke Kinoshita, Futoshi Ishii, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa
OH-free low loss single-mode fibre fabricated by slurry casting / rod-in-tube method. ECOC (2014)
Yixin Wang, Keisuke Kasai, Masato Yoshida, Masataka Nakazawa
60 Gbit/s, 64 QAM LD-based injection-locked coherent heterodyne transmission over 160 km with a spectral efficiency of 9 bit/s/Hz. IEICE Electron. Express 11 (18) (2014)
David Odeke Otuya, Keisuke Kasai, Toshihiko Hirooka, Masato Yoshida, Masataka 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)
Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka
Measurement of mode coupling distribution along a few-mode fiber using a synchronous multi-channel OTDR. OFC (2014)
Masato Yoshida, Toshihiko Hirooka, Keisuke Kasai, Masataka Nakazawa
Real-time adaptive 4-64 QAM coherent optical transmission over 320 km with FPGA-based transmitter and receiver. ECOC (2014)
Toshihiko Hirooka, Masataka Nakazawa, Tetsuro Komukai, Toshikazu 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)
Toshihiko Hirooka, Masataka Nakazawa, Tetsuro Komukai, Toshikazu Sakano
100 Gbit/s real-time digital coherent transmission over a 32 km legacy multi-mode graded-index fiber. IEICE Electron. Express 11 (15) (2014)
Koudai Harako, David Odeke Otuya, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa
Novel ultrafast TDM demultiplexing scheme using orthogonality in coherent Nyquist pulses. ECOC (2014)
Shohei Beppu, Keisuke Kasai, Masato Yoshida, Masataka 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)
Yukihiro Tsuchida, Koichi Maeda, Kengo Watanabe, Toshiharu Ito, Kiyoshi Fukuchi, Masato Yoshida, Yu Mimura, Ryuichi Sugizaki, Masataka Nakazawa
Multicore EDFA for DWDM transmission in full C-band. OFC/NFOEC (2013)
David Odeke Otuya, Keisuke Kasai, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa, Tokutaka Hara, Satoshi Oikawa
A single-channel, 1.6 Tbit/s 32 QAM coherent pulse transmission over 150 km with RZ-CW conversion and FDE techniques. OFC/NFOEC (2013)
Keisuke Kasai, Yixin Wang, Masataka Nakazawa
An LD-based ultra-low phase noise opll circuit using an optical voltage controlled oscillator. OFC/NFOEC (2013)
Koudai Harako, Peng Ruan, Toshihiko Hirooka, Masataka Nakazawa
Large PMD tolerant 1.28 Tbit/s/ch transmission over 525 km with 640 Gbaud optical Nyquist pulses. OFC/NFOEC (2013)
Tatsunori Omiya, Masato Yoshida, Masataka Nakazawa
400 Gbit/s 256 QAM-OFDM transmission over 720 km with a 14 bit/s/Hz spectral efficiency using an improved FDE technique. OFC/NFOEC (2013)
Toshikazu Sakano, Zubair Md. Fadlullah, Ngo Duc Thuan, Hiroki Nishiyama, Masataka Nakazawa, Fumiyuki Adachi, Nei Kato, Atsushi Takahara, Tomoaki Kumagai, Hiromichi Kasahara, Shigeki Kurihara
Disaster-resilient networking: a new vision based on movable and deployable resource units. IEEE Netw. 27 (4) (2013)
Kazunari Tokuhira, Fumitaka Suzuki, Masato Yoshida, Masataka Nakazawa
A Cesium optical atomic clock with high optical frequency stability. IEICE Electron. Express 9 (18) (2012)
Masato Yoshida, Seiji Okamoto, Tatsunori Omiya, Keisuke Kasai, Masataka Nakazawa
256 QAM Digital Coherent Optical Transmission Using Raman Amplifiers. IEICE Trans. Commun. (2) (2011)
Yixin Wang, Keisuke Kasai, Masataka Nakazawa
Polarization-multiplexed, 10Gsymbol/s, 64QAM coherent transmission over 150km with OPLL-based homodyne detection employing narrow linewidth LDs. IEICE Electron. Express 8 (17) (2011)
Pengyu Guan, Hans Christian Hansen Mulvad, Yutaro Tomiyama, Toshiyuki Hirano, Toshihiko Hirooka, Masataka Nakazawa
Single-Channel 1.28 Tbit/s-525 km DQPSK Transmission Using Ultrafast Time-Domain Optical Fourier Transformation and Nonlinear Optical Loop Mirror. IEICE Trans. Commun. (2) (2011)
Masataka Nakazawa
Foreword. IEICE Trans. Commun. (2) (2011)
Takahito Morisaki, Masato Yoshida, Masataka Nakazawa
Optical frequency-tunable Cs atomic clock with a 9.19GHz mode-hop-free fiber laser. IEICE Electron. Express 7 (21) (2010)
Tatsunori Omiya, Seiji Okamoto, Keisuke Kasai, Masato Yoshida, Masataka Nakazawa
60Gbit/s 64 QAM-OFDM coherent optical transmission with a 5.3GHz bandwidth. IEICE Electron. Express 7 (15) (2010)
Kengo Koizumi, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa
10Gbit/s photonic crystal fiber transmissions with 1.1µm directly-modulated single-mode VCSEL. IEICE Electron. Express 6 (22) (2009)
Hiroki Goto, Masato Yoshida, Tatsunori Omiya, Keisuke Kasai, Masataka Nakazawa
Polarization and frequency division multiplexed 1Gsymbol/s, 64 QAM coherent optical transmission with 8.6bit/s/Hz spectral efficiency over 160km. IEICE Electron. Express 5 (18) (2008)
Keisuke Kasai, Jumpei Hongo, Hiroki Goto, Masato Yoshida, Masataka Nakazawa
The use of a Nyquist filter for reducing an optical signal bandwidth in a coherent QAM optical transmission. IEICE Electron. Express 5 (1) (2008)
Akihito Suzuki, Youhei Takahashi, Masato Yoshida, Masataka Nakazawa
A CW, polarization-maintaining λ/4-shifted DFB Er-doped fiber laser at 1.54µm. IEICE Electron. Express 4 (8) (2007)
Keisuke Kasai, Jumpei Hongo, Masato Yoshida, Masataka Nakazawa
Optical phase-locked loop for coherent transmission over 500km using heterodyne detection with fiber lasers. IEICE Electron. Express 4 (3) (2007)
Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka
Ultra-Stable Regeneratively Mode-Locked Laser as an Opto-Electronic Microwave Oscillator and Its Application to Optical Metrology. IEICE Trans. Electron. (2) (2007)
Masataka Nakazawa, Toshihiko Hirooka
ABCD matrix formalism of time-domain optical Fourier transformation for distortion-free pulse transmission. IEICE Electron. Express 3 (4) (2006)
Hideaki Hasegawa, Yosuke Oikawa, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa
10Gb/s transmission over 5km at 850nm using single-mode photonic crystal fiber, single-mode VCSEL, and Si-APD. IEICE Electron. Express 3 (6) (2006)
Akihito Suzuki, Youhei Takahashi, Masataka Nakazawa
A polarization-maintained, ultranarrow FBG filter with a linewidth of 1.3GHz. IEICE Electron. Express 3 (22) (2006)
Keisuke Kasai, Akihito Suzuki, Masato Yoshida, Masataka Nakazawa
) frequency-stabilized fiber laser. IEICE Electron. Express 3 (22) (2006)
Toshihiko Hirooka, Takashi Kumakura, Kou Osawa, Masataka Nakazawa
Comparison of 40GHz optical demultiplexers using SMZ switch and EA modulator in 160Gbit/s-500km OTDM transmission. IEICE Electron. Express 3 (17) (2006)
Masataka Nakazawa
Soliton transmission in telecommunication networks. IEEE Commun. Mag. 32 (3) (1994)
Naoshi Uesugi, Tsuneo Horiguchi, Masataka Nakazawa, Yasuji Murakami
Optical Fiber Cable Measurements in the Field. IEEE J. Sel. Areas Commun. 4 (5) (1986)