Takushi Kazama

30 papers Journal 4Unranked 26

Year	Rank	Type	Title / Venue / Authors
2025	—	`conf`	27-THz ISRS-Supported Transmission Over 1040 km in S+C+L+U and Extreme Longer-Wavelength Band. OFC Shimpei Shimizu, Kosuke Kimura, Akira Kawai, Masashi Abe, Shunya Konno, Takushi Kazama, Masanori Nakamura, Fukutaro Hamaoka, Koji Enbutsu, Takahiro Kashiwazaki, Munehiko Nagatani, Hitoshi Wakita, Yuta Shiratori, Hiroshi Yamazaki, Hiroyuki Takahashi, Takeshi Umeki, Takayuki Kobayashi, Yutaka Miyamoto
2025	—	`conf`	9-THz Wideband PPLN-Based Wavelength Converter for Simultaneous Conversion of C+L-Band WDM Signal to Full S-Band. OFC Shunya Konno, Shimpei Shimizu, Masashi Abe, Takushi Kazama, Koji Enbutsu, Takahiro Kashiwazaki, Masanori Nakamura, Takayuki Kobayashi, Yutaka Miyamoto, Takeshi Umeki
2024	—	`conf`	C+L+U-Band 14.85-THz WDM Transmission Over 80-km-Span G.654.E Fiber with Hybrid PPLN-OPA/EDFA U-Band Lumped Repeater Using 144-Gbaud PCS-QAM Signals. OFC Takayuki Kobayashi, Shimpei Shimizu, Akira Kawai, Masanori Nakamura, Masashi Abe, Takushi Kazama, Takeshi Umeki, Munehiko Nagatani, Kosuke Kimura, Hitoshi Wakita, Yuta Shiratori, Fukutaro Hamaoka, Hiroshi Yamazaki, Hiroyuki Takahashi, Yutaka Miyamoto
2024	—	`conf`	Cascadability of PPLN-Based Inter-Band Wavelength Conversion for Band-Switchable Multi-Band Optical Cross-Connect. OFC Haruka Minami, Takafumi Fukatani, Masahiro Nakagawa, Takeshi Seki, Shimpei Shimizu, Takayuki Kobayashi, Takushi Kazama, Koji Enbutsu, Takeshi Umeki, Rie Hayashi, Takeshi Kuwahara
2024	—	`conf`	Modeling and Experimental Verification in S+C+L+U Quadrable-Band WDM Transmission System using C+L-Band Transceivers and Wavelength Converters. OFC Hidenobu Muranaka, Tomoyuki Kato, Tomohiro Yamauchi, Hiroyuki Irie, Hiroki Ooi, Yu Tanaka, Shimpei Shimizu, Takayuki Kobayashi, Takushi Kazama, Masashi Abe, Takeshi Umeki, Yutaka Miyamoto, Takeshi Hoshida
2024	—	`conf`	PPLN-Based Polarization-Diverse Phase-Sensitive Amplification of 96-Gbaud PDM-PCS-64QAM Signal with Carrier-Phase-Locked Phase-Conjugated Twin Waves. OFC Shimpei Shimizu, Takushi Kazama, Takeshi Umeki, Koji Enbutsu, Masanori Nakamura, Masashi Abe, Takayuki Kobayashi, Yutaka Miyamoto
2023	—	`conf`	103-ch. 132-Gbaud PS-QAM Signal Inline-amplified Transmission with 14.1-THz Bandwidth Lumped PPLN-based OPAs over 400-km G.652.D SMF. OFC Takayuki Kobayashi, Shimpei Shimizu, Masanori Nakamura, Takushi Kazama, Masashi Abe, Takeshi Umeki, Akira Kawai, Fukutaro Hamaoka, Munehiko Nagatani, Hiroshi Yamazaki, Yutaka Miyamoto
2023	—	`conf`	38.4-Tbps Inline-amplified Transmission Using PPLN-based Optical Parametric Amplifier over 6 THz within L- and U-bands. OFC Shimpei Shimizu, Takayuki Kobayashi, Akira Kawai, Takushi Kazama, Masanori Nakamura, Koji Enbutsu, Takahiro Kashiwazaki, Masashi Abe, Takeshi Umeki, Yutaka Miyamoto, Tomoyuki Kato, Yu Tanaka, Takeshi Hoshida
2023	—	`conf`	Experimental Demonstration of Cascadable PPLN-Based Inter-Band Wavelength Converters for Band-Switchable Multi-Band Optical Cross-Connect. OFC Haruka Minami, Kenta Hirose, Takafumi Fukatani, Masahiro Nakagawa, Takeshi Seki, Shimpei Shimizu, Takayuki Kobayashi, Takushi Kazama, Koji Enbutsu, Kei Watanabe, Takeshi Umeki, Takashi Miyamura, Takeshi Kuwahara
2023	J	`jnl`	S-Band WDM Transmission Using PPLN-Based Wavelength Converters and 400-Gb/s C-Band Real-Time Transceivers. IEICE Trans. Commun. Tomoyuki Kato, Hidenobu Muranaka, Yu Tanaka, Yuichi Akiyama, Takeshi Hoshida, Shimpei Shimizu, Takayuki Kobayashi, Takushi Kazama, Takeshi Umeki, Kei Watanabe, Yutaka Miyamoto
2022	—	`conf`	50-Tb/s (1 Tb/s × 50 ch) WDM Transmission on Two 6.25-THz Bands Using Hybrid Inline Repeater of PPLN-based OPAs and Incoherent-forward-pumped DRA. OFC Takayuki Kobayashi, Shimpei Shimizu, Masanori Nakamura, Takeshi Umeki, Takushi Kazama, Junji Yoshida, Shigehiro Takasaka, Yasuto Tatamida, Hiroto Kawakami, Fukutaro Hamaoka, Munehiko Nagatani, Hiroshi Yamazaki, Kei Watanabe, Takashi Saida, Yutaka Miyamoto
2022	J	`jnl`	Channel Arrangement Design in Lumped Amplified WDM Transmission over NZ-DSF Link with Nonlinearity Mitigation Using Optical Phase Conjugation. IEICE Trans. Commun. Shimpei Shimizu, Takayuki Kobayashi, Takeshi Umeki, Takushi Kazama, Koji Enbutsu, Ryoichi Kasahara, Yutaka Miyamoto
2022	—	`conf`	Generation of Carrier-Synchronized PDM Signal-Idler Pair for Polarization-Independent Phase-Sensitive Amplification. OECC/PSC Shimpei Shimizu, Takushi Kazama, Takeshi Umeki, Takayuki Kobayashi, Koji Enbutsu, Kei Watanabe, Yutaka Miyamoto
2022	—	`conf`	Mitigation of Intercore Crosstalk Impact with PPLN-based Optical Spectrum Inversion. OECC/PSC Megumi Hoshi, Kohki Shibahara, Shimpei Shimizu, Takayuki Kobayashi, Takeshi Umeki, Takushi Kazama, Kei Watanabe, Takayoshi Mori, Yusuke Yamada, Kazuhide Nakajima, Yutaka Miyamoto
2022	—	`conf`	WDM Transmission in S-Band Using PPLN-Based Wavelength Converters and 400-Gb/s C-Band Real-Time Transceivers. OECC/PSC Tomoyuki Kato, Hidenobu Muranaka, Yu Tanaka, Yuichi Akiyama, Takeshi Hoshida, Shimpei Shimizu, Takayuki Kobayashi, Takushi Kazama, Takeshi Umeki, Kei Watanabe, Yutaka Miyamoto
2021	—	`conf`	13.4-Tb/s WDM Transmission over 1, 280 km Repeated only with PPLN-based Optical Parametric Inline Amplifier. ECOC Takayuki Kobayashi, Shimpei Shimizu, Masanori Nakamura, Takushi Kazama, Takeshi Umeki, Ryoichi Kasahara, Fukutaro Hamaoka, Yutaka Miyamoto
2021	—	`conf`	8-Tbps (20 × 400 Gbps) Unrepeated Transmission over 80 km with 2-THz PPLN-Based Phase-Sensitive Amplification Using Precise Chromatic Dispersion Pre-Compensation. ECOC Shimpei Shimizu, Takayuki Kobayashi, Takushi Kazama, Takeshi Umeki, Masanori Nakamura, Koji Enbutsu, Ryoichi Kasahara, Yutaka Miyamoto
2021	—	`conf`	Wideband PPLN-based optical parametric amplifiers for scalable optical transport network. OFC Yutaka Miyamoto, Takayuki Kobayashi, Takeshi Umeki, Takushi Kazama, Koji Enbutsu, Shimpei Shimizu, Ryoichi Kasahara
2020	—	`conf`	Gain Ripple and Passband Narrowing Due to Residual Chromatic Dispersion in Non-Degenerate Phase-Sensitive Amplifiers. OFC Shimpei Shimizu, Takushi Kazama, Takayuki Kobayashi, Takeshi Umeki, Koji Enbutsu, Ryoichi Kasahara, Yutaka Miyamoto
2020	J	`jnl`	Nonlinearity Mitigation of PDM-16QAM Signals Using Multiple CSI-OPCs in Ultra-Long-Haul Transmission without Excess Penalty. IEICE Trans. Commun. Takeshi Umeki, Takayuki Kobayashi, Akihide Sano, Takuya Ikuta, Masashi Abe, Takushi Kazama, Koji Enbutsu, Ryoichi Kasahara, Yutaka Miyamoto
2020	J	`jnl`	PPLN-Based Low-Noise Phase Sensitive Amplification Using an Optical Phase-Locked Pump. IEICE Trans. Commun. Takushi Kazama, Takeshi Umeki, Yasuhiro Okamura, Koji Enbutsu, Osamu Tadanaga, Atsushi Takada, Ryoichi Kasahara
2020	—	`conf`	Wideband Inline-Amplified WDM Transmission using PPLN-Based OPA with Over-10-THz Bandwidth. OFC Takayuki Kobayashi, Shimpei Shimizu, Masahito Nakamura, Takeshi Umeki, Takushi Kazama, Ryoichi Kasahara, Fukutaro Hamaoka, Munehiko Nagatani, Hiroshi Yamazaki, Takayuki Mizuno, Hideyuki Nosaka, Yutaka Miyamoto
2019	—	`conf`	1.4μm-1.6μm Wavelength Conversion Using Multiple Quasi-Phase Matching LiNbO3. OECC/PSC Saroeun Punhavan, Masato Kato, Keisuke Sugiyama, Masaki Asobe, Takeshi Umeki, Koji Enbutsu, Takushi Kazama, Takahiro Kashiwazaki, Ryoichi Kasahara
2019	—	`conf`	Low-Noise Phase Sensitive Amplification Using an Optical Phase-Locked Pump. OECC/PSC Takushi Kazama, Takeshi Umeki, Yasuhiro Okamura, Koji Enbutsu, Osamu Tadanaga, Atsushi Takada, Ryoichi Kasahara
2019	—	`conf`	Nonlinearity mitigation of PDM-16QAM signal using multiple CSI-OPCs in ultra-long haul transmission without excess penalty. OECC/PSC Takeshi Umeki, Takayuki Kobayashi, Akihide Sano, Takuya Ikuta, Masashi Abe, Takushi Kazama, Koji Enbutsu, Ryoichi Kasahara, Yutaka Miyamoto
2018	—	`conf`	Polarization-diversity In-line Phase Sensitive Amplifier for Simultaneous Amplification of Fiber-transmitted WDM PDM-16QAM Signals. OFC Takeshi Umeki, Takushi Kazama, Takayuki Kobayashi, Shigehiro Takasaka, Yasuhiro Okamura, Koji Enbutsu, Osamu Tadanaga, Hirokazu Takenouchi, Ryuichi Sugizaki, Atsushi Takada, Ryoichi Kasahara, Yutaka Miyamoto
2018	—	`conf`	Towards Practical Implementation of Optical Parametric Amplifiers Based on PPLN Waveguides. OFC Takeshi Umeki, Takushi Kazama, Takayuki Kobayashi, Koji Enbutsu, Osamu Tadanaga, Hirokazu Takenouchi, Ryoichi Kasahara, Yutaka Miyamoto
2016	—	`conf`	Low-noise phase-sensitive amplifier for guard-band-less 16-channel DWDM signal using PPLN waveguides. OFC Takushi Kazama, Takeshi Umeki, Masashi Abe, Koji Enbutsu, Yutaka Miyamoto, Hirokazu Takenouchi
2015	—	`conf`	Spectrally efficient optical phase conjugation based on complementary spectral inversion for nonlinearity mitigation. ECOC Takeshi Umeki, Takushi Kazama, H. Ono, Yutaka Miyamoto, Hirokazu Takenouchi
2014	—	`conf`	First demonstration of PDM signal amplification using PPLN-based polarization-independent phase sensitive amplifier. ECOC Takeshi Umeki, Takushi Kazama, Osamu Tadanaga, Koji Enbutsu, Masaki Asobe, Yutaka Miyamoto, Hirokazu Takenouchi