Suppression of the Cross-Gain Modulation in Remotely-Pumped EDF/DRA Hybrid Inline Amplifier Systems with Online OTDR for Gain Monitoring. - Hiroto Kawakami; Hiroji Masuda; Kenji Sato; Yutaka Miyamoto (IEICE Trans. Commun., 2005)

12-core × 3-mode dense space division multiplexed transmission over 40 km employing multi-carrier signals with parallel MIMO equalization. - Takayuki Mizuno; Takayuki Kobayashi; Hidehiko Takara; Akihide Sano; Hiroto Kawakami; T. Nakagawa; Yutaka Miyamoto; Yoshiteru Abe; T. Goh; Manabu Oguma; Taiji Sakamoto; Yusuke Sasaki; et al. (OFC, 2014)

Adaptive MIMO equalization for few-mode fiber transmission with various differential mode delays. - D. Lee; Kohki Shibahara; Takayuki Kobayashi; Takayuki Mizuno; Hidehiko Takara; Akihide Sano; Hiroto Kawakami; T. Nakagawa; Yutaka Miyamoto (ECOC, 2015)

Optical DP-High Order-QAM Transmission System for High-Speed Short Links Utilizing Copropagating Twin Local Lights. - Hiroto Kawakami; Takayuki Kobayashi; Yutaka Miyamoto (IEICE Trans. Commun., 2016)

Novel Optimizing Technique for Linear Optical Mach-Zehnder Modulator and its Experimental Verification Using PAM-8 Signal. - Hiroto Kawakami; Hiroshi Yamazaki; Yutaka Miyamoto (ECOC, 2018)

Full C-Band 3060-km DMD-Unmanaged 3-Mode Transmission with 40.2-Tb/s Capacity using Cyclic Mode Permutation. - Kohki Shibahara; Takayuki Mizuno; Hiroto Kawakami; Takayuki Kobayashi; Masanori Nakamura; Kota Shikama; Kazuhide Nakajima; Yutaka Miyamoto (OFC, 2019)

Proposal and verification of auto calibration technique for bias control circuit connecting to imperfect IQ-modulator. - Hiroto Kawakami; Shoichiro Kuwahara; Yoshiaki Kisaka (OECC/PSC, 2019)

Gain Instability in Forward-Pumped Raman Amplifier and Its Suppression Utilizing a Dual-Arm Depolarizer for Pump Light. - Hiroto Kawakami; Shoichiro Kuwahara; Yoshiaki Kisaka (ECOC, 2020)

Proposal and Verification of Auto Calibration Technique for Bias Control Circuit Connecting to Built-In Optical Power Monitor in Imperfect IQ-Modulator. - Hiroto Kawakami; Shoichiro Kuwahara; Yoshiaki Kisaka (IEICE Trans. Commun., 2020)

Revealing Raman-amplified Power Profile and Raman Gain Spectra with Digital Backpropagation. - Takeo Sasai; Masanori Nakamura; Takayuki Kobayashi; Hiroto Kawakami; Etsushi Yamazaki; Yoshiaki Kisaka (OFC, 2021)

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. - Takayuki Kobayashi; Shimpei Shimizu; Masanori Nakamura; Takeshi Umeki; Takushi Kazama; Junji Yoshida; Shigehiro Takasaka; Yasuto Tatamida; Hiroto Kawakami; Fukutaro Hamaoka; Munehiko Nagatani; Hiroshi Yamazaki; et al. (OFC, 2022)

Dither-free Bias Condition Monitoring Technique Utilizing Reference Light for In- service Optical IQ modulator. - Hiroto Kawakami; Shoichiro Kuwahara; Yoshiaki Kisaka (OECC/PSC, 2022)

Dither-free Auto Bias Control Technique for In-service Optical IQ modulator Using Reference Pulsed Light. - Hiroto Kawakami; Yoshiaki Kisaka; Etsushi Yamazaki (APCC, 2023)