SDM-compatible dynamic gain equalizer using spatial and planar optical circuit. - Mitsumasa Nakajima; Kenya Suzuki; Keita Yamaguchi; Hirotaka Ono 002; Hiroki Kawahara; Mitsunori Fukutoku; Takayuki Mizuno; Yutaka Miyamoto; Toshikazu Hashimoto (OFC, 2017)

Integrated Wavelength Selective Switch Array for Space Division Multiplexed Network with Ultra-Low Inter-Spatial Channel Crosstalk. - Keita Yamaguchi; Kazunori Seno; Kenya Suzuki; Hiroki Kawahara; Mitsunori Fukutoku; Toshikazu Hashimoto; Yutaka Miyamoto (OFC, 2018)

Dual-Carrier 1-Tb/s Transmission Over Field-Deployed Large-Core Pure-Silica-Core Fiber Link Using Real-Time Transponder. - Fukutaro Hamaoka; Takeo Sasai; Kohei Saito; Takayuki Kobayashi; Asuka Matsushita; Masanori Nakamura; Hiroki Taniguchi; Shoichiro Kuwahara; Hiroki Kawahara; Takeshi Seki; Josuke Ozaki; Yoshihiro Ogiso; et al. (OECC/PSC, 2019)

Real-time demonstration of 600Gbps/carrier WDM transmission and highly-survivable adaptive restoration on field installed fiber. - Hiroki Kawahara; Kohei Saito; Masahiro Nakagawa; Takashi Kubo; Takeshi Seki; Takeshi Kawasaki; Hideki Maeda; Tomohiro Sekino; Naoki Bannai; Masaki Shinkai; Tomoki Sakamaki; Kenjiro Yamanaka; et al. (OECC/PSC, 2019)

Numerical Analysis of Adaptive Restoration in Optical Transport Networks. - Masahiro Nakagawa; Hiroki Kawahara; Kana Masumoto; Hidetoshi Onda; Kazuyuki Matsumura (OECC/PSC, 2019)

Throughput Enhancement with Overlay Network Virtualization Using Commodity Devices. - Hiroki Kawahara; Ryo Yamamoto; Satoshi Ohzahata; Toshihiko Kato (UCC Companion, 2019)

Experimental Demonstration of Wavelength-Selective Band/Direction-Switchable Multi-Band OXC Using an Inter-Band All-Optical Wavelength Converter. - Hiroki Kawahara; Masahiro Nakagawa; Takeshi Seki; Takashi Miyamura (ECOC, 2020)

The Impact of Nonlinear Phase Noise Induced from Low-Speed Optical Supervisory Channel on Soft-Decision FEC Performance. - Hiroki Kawahara; Kohei Saito; Takeshi Seki; Takeshi Kawasaki; Hideki Maeda (OFC, 2020)

Real-Time Demonstration of 500-Gbps/Lambda and 600-Gbps/Lambda WDM Transmission on Field-Installed Fibers. - Hideki Maeda; Hiroki Kawahara; Kohei Saito; Takeshi Seki; Takeo Sasai; Fukutaro Hamaoka (OFC, 2020)

High spectral efficiency real-time 500-Gb/s/carrier transmission over field-installed G.654.E fiber link using forward and backward distributed Raman amplification. - Kohei Saito; Takeo Sasai; Fukutaro Hamaoka; Hiroki Kawahara; Takeshi Seki; Hideki Maeda (OFC, 2020)

Dual-Carrier 1-Tb/s Transmission Over Field-Deployed G.654.E Fiber Link Using Real-Time Transponder. - Fukutaro Hamaoka; Takeo Sasai; Kohei Saito; Takayuki Kobayashi; Asuka Matsushita; Masanori Nakamura; Hiroki Taniguchi; Shoichiro Kuwahara; Hiroki Kawahara; Takeshi Seki; Josuke Ozaki; Yoshihiro Ogiso; et al. (IEICE Trans. Commun., 2020)

Adaptive Link-by-Link Band Allocation: A Novel Adaptation Scheme in Multi-Band Optical Networks. - Masahiro Nakagawa; Hiroki Kawahara; Takeshi Seki; Takashi Miyamura (ONDM, 2021)

Analysis of Signal Distribution in ASE-Limited Optical On-Off Keying Direct-Detection Systems. - Hiroki Kawahara; Kyo Inoue; Koji Igarashi (IEICE Trans. Commun., 2021)

Real-Time Experiment and Numerical Analysis of Highly-Survivable Adaptive Restoration for High-Capacity Optical Signal Transmission. - Hiroki Kawahara; Kohei Saito; Masahiro Nakagawa; Takashi Kubo; Takeshi Seki; Takeshi Kawasaki; Hideki Maeda (IEICE Trans. Commun., 2021)

Magic Drops: Food 3D Printing of Colored Liquid Balls by Ultrasound Levitation. - Hiroki Kawahara; Kaito Yamao; Kentaro Oda (UIST (Adjunct Volume), 2022)

Highly Efficient Multi-Band Optical Networks with Wavelength-Selective Band Switching. - Masahiro Nakagawa; Hiroki Kawahara; Takeshi Seki; Takashi Miyamura (IEICE Trans. Commun., 2023)

Level Allocation of Four-Level Pulse-Amplitude Modulation Signal in Optically Pre-Amplified Receiver Systems. - Hiroki Kawahara; Koji Igarashi; Kyo Inoue (IEICE Trans. Commun., 2023)

Remote Ship Control through Head Mounted Display (HMD) Based User Experience. - Kaito Yamao; Hiroki Kawahara; Masayuki Kashima; Takayasu Fuchida; Kentaro Oda (ICCCM, 2024)

No-guard-band integration of digital coherent CV-QKD system into 400 Gbit/s 75 GHz grid DWDM systems. - Tetsuo Kawakami; Hiroki Kawahara; Toshihiko Okamura; Ken-Ichiro Yoshino; Wakako Maeda (OFC, 2024)