Optical FSK/IM Signal Generation Using an Integrated Optical FSK Modulator. - Tetsuya Kawanishi; Kaoru Higuma; Takahisa Fujita; Junichiro Ichikawa; Satoshi Shinada; Takahide Sakamoto; Masayuki Izutsu (IEICE Electron. Express, 2004)

Optical frequency comb generator using optical fiber loops with single-sideband modulation. - Tetsuya Kawanishi; Takahide Sakamoto; Satoshi Shinada; Masayuki Izutsu (IEICE Electron. Express, 2004)

10Gbit/s FSK transmission over 95km SMF using a LiNbO3 modulator. - Takahisa Fujita; Tetsuya Kawanishi; Kaoru Higuma; Junichiro Ichikawa; Satoshi Shinada; Takahide Sakamoto; Masayuki Izutsu (IEICE Electron. Express, 2005)

Optical FSK transmission with group delay compensated balance detection. - Tetsuya Kawanishi; Takahisa Fujita; Kaoru Higuma; Junichiro Ichikawa; Takahide Sakamoto; Masayuki Izutsu (IEICE Electron. Express, 2005)

Integrated reciprocating optical modulator using phase-shifted fiber Bragg grating. - Tetsuya Kawanishi; Satoshi Oikawa; Kiichi Yoshiara; Satoshi Shinada; Takahide Sakamoto; Masayuki Izutsu (IEICE Electron. Express, 2005)

Pulse-carving technique for suppressing transient state in external wideband FSK modulation. - Takahide Sakamoto; Tetsuya Kawanishi; Masayuki Izutsu (IEICE Electron. Express, 2005)

Amplitude modulation on millimeter-wave signal with low driving voltage using reciprocating optical modulator. - Takahide Sakamoto; Tetsuya Kawanishi; Satoshi Shinada; Masayuki Izutsu (IEICE Electron. Express, 2005)

Optical filter characterization by using optical frequency sweep technique with a single sideband modulator. - Tetsuya Kawanishi; Takahide Sakamoto; Masayuki Izutsu (IEICE Electron. Express, 2006)

An optical grating filter dry-etched on a LiNbO3 substrate. - Satoshi Shinada; Tetsuya Kawanishi; Takahide Sakamoto; Masayuki Izutsu (IEICE Electron. Express, 2006)

Simple, low fluctuation voltage signal generation for 8-Gb/s quadrature amplitude modulation using dual-parallel Mach-Zehnder modulator. - Akito Chiba; Takahide Sakamoto; Tetsuya Kawanishi; Masayuki Izutsu (IEICE Electron. Express, 2008)

Integrated Lithium Niobate Mach-Zehnder Interferometers for Advanced Modulation Formats. - Tetsuya Kawanishi; Takahide Sakamoto; Akito Chiba (IEICE Trans. Electron., 2009)

120-Gb/s NRZ-DQPSK signal generation by a thin-lithium-niobate-substrate modulator. - Atsushi Kanno; Takahide Sakamoto; Akito Chiba; Tetsuya Kawanishi; Kaoru Higuma; Masaaki Sudou; Junichiro Ichikawa (IEICE Electron. Express, 2010)

20-Gb/s QPSK W-band (75-110GHz) wireless link in free space using radio-over-fiber technique. - Atsushi Kanno; Keizo Inagaki; Isao Morohashi; Takahide Sakamoto; Toshiaki Kuri; Iwao Hosako; Tetsuya Kawanishi; Yuki Yoshida; Ken-ichi Kitayama (IEICE Electron. Express, 2011)

90 Gbaud NRZ-DP-DQPSK Modulation with Full-ETDM Technique Using High-Speed Optical IQ Modulator. - Atsushi Kanno; Takahide Sakamoto; Akito Chiba; Masaaki Sudo; Kaoru Higuma; Junichiro Ichikawa; Tetsuya Kawanishi (IEICE Trans. Electron., 2011)

Synthesis of 16 Quadrature Amplitude Modulation Using Polarization-Multiplexing QPSK Modulator. - Isao Morohashi; Takahide Sakamoto; Masaaki Sudo; Atsushi Kanno; Akito Chiba; Junichiro Ichikawa; Tetsuya Kawanishi (IEICE Trans. Commun., 2011)

Optical 64QAM transmitter using tandem IQ modulators with balanced complexity in electronics and optics. - Guo-Wei Lu; Takahide Sakamoto; Tetsuya Kawanishi (OFC/NFOEC, 2013)

Filter-less multi-tone coherent orthogonal detection for multi-channel reception of super-channel/OFDM signals. - Takahide Sakamoto; Guo-Wei Lu; Tetsuya Kawanishi (OFC/NFOEC, 2013)

Generation of Millimeter Waves with Fine Frequency Tunability Using Mach-Zehnder-Modulator-Based Flat Comb Generator. - Isao Morohashi; Yoshihisa Irimajiri; Takahide Sakamoto; Tetsuya Kawanishi; Motoaki Yasui; Iwao Hosako (IEICE Trans. Electron., 2013)

Pump-linewidth-tolerant optical data exchange between 16QAM and QPSK with 50-GHz channel-spacing using coherent DFB pump. - Guo-Wei Lu; Andre A. C. Albuquerque; Benjamin J. Puttnam; Takahide Sakamoto; Miguel V. Drummond; Rogério Nogueira; Atsushi Kanno; Satoshi Shinada; Naoya Wada; Tetsuya Kawanishi (ECOC, 2014)

Coherently-pumped FWM in HNLF for 16QAM wavelength conversion free of phase noise from pumps. - Guo-Wei Lu; Takahide Sakamoto; Tetsuya Kawanishi (ECOC, 2014)

Error-free and laser-phase-noise-insensitive optical coherent transmission of uplink radio-over-fiber signal. - Toshiaki Kuri; Takahide Sakamoto; Guo-Wei Lu; Tetsuya Kawanishi (OFC, 2014)

Time-interleaved carrier-suppressed return-to-zero QPSK for filter-less dual-carrier transmission. - Takahide Sakamoto; Guo-Wei Lu; Tetsuya Kawanishi (OFC, 2014)

Oppositely-biased dual-polarization IQ modulators for nonlinearity-tolerant polarization-multiplexed phase-conjugated twin-signals generation. - Takahide Sakamoto; Guo-Wei Lu; Tetsuya Kawanishi (ECOC, 2015)

Laser-phase-fluctuation-insensitive optical coherent transmission of 16-QAM radio-over-fiber signal with offset-frequency-spaced two-tone local light. - Toshiaki Kuri; Takahide Sakamoto; Tetsuya Kawanishi (OFC, 2015)

Pump-phase-noise-tolerant wavelength multicasting for QAM signals using flexible coherent multi-carrier pump. - Guo-Wei Lu; Takahide Sakamoto; Tetsuya Kawanishi (OFC, 2015)

Optical comb-based versatile wavelength division multicasting add-drop node for efficient WDM networks. - Jun Sakaguchi; Takahide Sakamoto; Atsushi Kanno; Yoshinari Awaji; Naoya Wada; Tetsuya Kawanishi (OFC, 2015)

Loop-assisted multi-input-multi-output coherent matched detector for ultra high-bandwidth parallel optical time-frequency domain sampling. - Takahide Sakamoto; Guo-Wei Lu; Tetsuya Kawanishi (OFC, 2015)

Multifunctional all-optical signal processing scheme for simultaneous multichannel WDM multicast and XOR logic gates based on FWM in QD-SOA. - Danshi Wang; Min Zhang 016; Guo-Wei Lu; Jun Qin; Takahide Sakamoto; Kouichi Akahane; Naokatsu Yamamoto; Tetsuya Kawanishi; Ze Li 007; Yue Cui (OFC, 2015)

Sub-THz radio-over-fiber signal generation using external modulation. - Tetsuya Kawanishi; Takahide Sakamoto; Atsushi Kanno (IEICE Electron. Express, 2015)

Generation of Arbitrarily Patterned Pulse Trains in the THz Range by Spectral Synthesis of Optical Combs. - Isao Morohashi; Takahide Sakamoto; Norihiko Sekine; Tetsuya Kawanishi; Akifumi Kasamatsu; Iwao Hosako (IEICE Trans. Electron., 2015)

Opto-electronic time-frequency domain sampling for ultra high-bandwidth multi-carrier signal detection. - Takahide Sakamoto (OFC, 2016)

Ultrashort optical pulse source using Mach-Zehnder-modulator-based flat comb generator. - Isao Morohashi; Takahide Sakamoto; Norihiko Sekine; Akifumi Kasamatsu; Iwao Hosako (Nano Commun. Networks, 2016)

Flexible high-order QAM transmitters for elastic optical networks. - Guo-Wei Lu; Takahide Sakamoto; Tetsuya Kawanishi (Photonic Netw. Commun., 2016)

Optical Subcarrier Processing for Nyquist SCM via Coherent Spectrum Overlapping in FWM with Coherent Pump. - Guo-Wei Lu; Ruben S. Luis; Jose Manuel Delgado Mendinueta; Takahide Sakamoto; Naokatsu Yamamoto (ECOC, 2017)

Spatial Coherent Matched Detection Using High-Speed Two Dimensional Photo-Diode Array for Full-Channel Demultiplexing and Demodulation of Mode-Division-Multiplexed Signals. - Takahide Sakamoto; Toshimasa Umezawa; Guo-Wei Lu; Kouichi Akahane; Atsushi Matsumoto; Atsushi Kanno; Naokatsu Yamamoto; Tetsuya Kawanishi (ECOC, 2017)

Ultrafast demultiplexing of optical time-division multiplexed signals by parallel opto-electronic time-frequency domain sampling. - Takahide Sakamoto; Guo-Wei Lu; Naokatsu Yamamoto (OFC, 2017)

Simple Self-Homodyne Detection Scheme for Optical OFDM With Inserted Pilot Subframes and Application in Optical Access Networks. - Guo-Wei Lu; Xun Guan; Takahide Sakamoto; Naokatsu Yamamoto; Calvin Chun-Kit Chan (IEEE Access, 2017)

400-Gbps Space Division Multiplexing Optical Wireless Communication Using Two-Dimensional Photodetector Array. - Toshimasa Umezawa; Takahide Sakamoto; Atsushi Kanno; Shinya Nakajima; Atsushi Matsumoto; Naokatsu Yamamoto; Tetsuya Kawanishi (ECOC, 2018)

High-speed Two-dimensional Photodetector Array for 4-WDM 25-Gbaud FSO Communication. - Toshimasa Umezawa; Takahide Sakamoto; Atsushi Kanno; Kouichi Akahane; Atsushi Matsumoto; Naokatsu Yamamoto; Tetsuya Kawanishi (OFC, 2018)

Simultaneous Compensation of Fiber Nonlinearity and Dispersive Fading Effects by Conjugated-Paired Radio-on-Fiber Transmission with Phase-Shifted Dual-Sideband Downconversion. - Takahide Sakamoto; Guo-Wei Lu; Naokatsu Yamamoto; Tetsuya Kawanishi (OECC/PSC, 2019)

Variable-linewidth light source based on Brownian motion random walk in optical phase. - Jun Mochizuki; Keizo Inagaki; Guo-Wei Lu; Takahide Sakamoto; Yuki Yoshida; Atsushi Kanno; Naokatsu Yamamoto; Tetsuya Kawanishi (IEICE Electron. Express, 2020)

Nonlinear Tolerant Conjugated RoF System Secured by Physical Layer Encryption with Deliberate Signal Randomization. - Tatsuki Ishijima; Shuhei Otsuka; Shun Harada; Takahide Sakamoto; Ken Tanizawa; Fumio Futami (OFC, 2023)

Parallel Extension of High-Speed Analog-Circuit FIR Equalizer for Low-Latency Optical Transceiver/Receiver. - Shuhei Otsuka; Ryo Koguchi; Takahide Sakamoto (OFC, 2023)

Filter-Less Synthesis of 50-GHz Double-Spaced Flat Optical Comb by In-phase/Quadrature Electro-Optic Modulator for High Bandwidth Transmission. - Shun Harada; Tatsuki Ishijima; Takahide Sakamoto (OFC, 2024)

Fiber Nonlinearity Compensation Using Nonlinear Equalizer Based on Complex-Valued Reservoir Computing. - Kai Ikuta; Yuta Ito; Takahide Sakamoto; Naokatsu Yamamoto; Moriya Nakamura (IEICE Trans. Commun., 2025)