High-Speed Optical Packet Processing Technologies for Optical Packet-Switched Networks. - Hirokazu Takenouchi; Tatsushi Nakahara; Kiyoto Takahata; Ryo Takahashi; Hiroyuki Suzuki (IEICE Trans. Electron., 2005)

PPLN based phase sensitive amplifiers and their applications. - Masaki Asobe; Takeshi Umeki; Hirokazu Takenouchi (OFC/NFOEC, 2013)

First demonstration of multi-span transmission using phase and amplitude regeneration in PPLN-based PSA. - Takeshi Umeki; Masaki Asobe; H. Takara; Takayuki Kobayashi; Hirokazu Kubota; Hirokazu Takenouchi; Yutaka Miyamoto (OFC/NFOEC, 2013)

Real-Time N2O Gas Detection System for Agricultural Production Using a 4.6-µm-Band Laser Source Based on a Periodically Poled LiNbO3 Ridge Waveguide. - Akio Tokura; Masaki Asobe; Koji Enbutsu; Toshihiro Yoshihara; Shin-nosuke Hashida; Hirokazu Takenouchi (Sensors, 2013)

First demonstration of PDM signal amplification using PPLN-based polarization-independent phase sensitive amplifier. - Takeshi Umeki; Takushi Kazama; Osamu Tadanaga; Koji Enbutsu; Masaki Asobe; Yutaka Miyamoto; Hirokazu Takenouchi (ECOC, 2014)

Low noise and regenerative phase sensitive amplifier based on PPLN waveguides. - Takeshi Umeki; Masaki Asobe; H. Takara; Osamu Tadanaga; Koji Enbutsu; Yutaka Miyamoto; Hirokazu Takenouchi (OFC, 2014)

PPLN-based low-noise in-line phase sensitive amplifier with highly sensitive carrier-recovery system. - Koji Enbutsu; Takeshi Umeki; Osamu Tadanaga; Hirokazu Takenouchi; Masaki Asobe (APCC, 2015)

Spectrally efficient optical phase conjugation based on complementary spectral inversion for nonlinearity mitigation. - Takeshi Umeki; Takushi Kazama; H. Ono; Yutaka Miyamoto; Hirokazu Takenouchi (ECOC, 2015)

Low-noise phase-sensitive amplifier for guard-band-less 16-channel DWDM signal using PPLN waveguides. - Takushi Kazama; Takeshi Umeki; Masashi Abe; Koji Enbutsu; Yutaka Miyamoto; Hirokazu Takenouchi (OFC, 2016)

96-Gbaud PDM-8QAM Single Channel Transmission over 9, 600 km by Nonlinear Tolerance Enhancement using PPLN-based Optical Phase Conjugation. - Takayuki Kobayashi; Takeshi Umeki; Ryoichi Kasahara; Hiroshi Yamazaki; Munehiko Nagatani; Hitoshi Wakita; Hirokazu Takenouchi; Yutaka Miyamoto (OFC, 2018)

Towards Practical Implementation of Optical Parametric Amplifiers Based on PPLN Waveguides. - Takeshi Umeki; Takushi Kazama; Takayuki Kobayashi; Koji Enbutsu; Osamu Tadanaga; Hirokazu Takenouchi; Ryoichi Kasahara; Yutaka Miyamoto (OFC, 2018)

Polarization-diversity In-line Phase Sensitive Amplifier for Simultaneous Amplification of Fiber-transmitted WDM PDM-16QAM Signals. - Takeshi Umeki; Takushi Kazama; Takayuki Kobayashi; Shigehiro Takasaka; Yasuhiro Okamura; Koji Enbutsu; Osamu Tadanaga; Hirokazu Takenouchi; Ryuichi Sugizaki; Atsushi Takada; Ryoichi Kasahara; Yutaka Miyamoto (OFC, 2018)