Keisuke Kasai

Publication Activity (10 Years)

Years Active: 2006-2024
Publications (10 Years): 36

Top Topics

Top Venues

IEICE Trans. Commun.

Publications

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)
D. Nakajima, K. Nishimura, M. Watanabe, T. T. Lin, Keisuke Kasai, Masato Yoshida, Tetsuya Suemitsu, Taiichi Otsuji, Akira Satou
Conversion Gain Enhancement of a UTC-PD-Integrated HEMT Photonic Double-Mixer by High-Intensity Optical Subcarrier Signal. OFC (2023)
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)
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)
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)
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)
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)
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)
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)
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)
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)
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)
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)
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)
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)
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)
Kyoji Kawagoe, Keisuke Kasai
STRAC: Personal Information Access Control for Emergency Systems. SERVICES (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)
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)
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)
Keisuke Kasai, Akihito Suzuki, Masato Yoshida, Masataka Nakazawa
) frequency-stabilized fiber laser. IEICE Electron. Express 3 (22) (2006)