Hiroki Kawahara

22 papers Journal 6Unranked 16
YearRankTypeTitle / Venue / Authors
2025 — conf
Highly Resilient Heterogeneous QKD Systems Integrated into Live Carrier-Grade C+L-Band ROADM-Based Links.
ECOC
Hiroki Kawahara, Yasuhiro Katsube, Tetsuo Kawakami, Kotaro Ueda, Yu Yu, Toshihiko Okamura, Keisuke Mera, Yoshimichi Tanizawa, Masashi Ito, Mikio Fujiwara, Masahide Sasaki, Wakako Maeda, Naoto Ishii
2025 — conf
Polarization-Independent 2.5-GHz Four-Encoding / Two-Decoy State BB84 QKD Systems Using Gated InGaAs SPADs.
ECOC
Hiroki Kawahara, Seigo Takahashi, Toshihiko Okamura, Wakako Maeda, Naoto Ishii
2024 J jnl
Coexistence Demonstration and Wavelength Dependency Analysis of S-Band CV-QKD Signal with Fully Loaded C+L-Band DWDM Signals.
Entropy
Tetsuo Kawakami, Hiroki Kawahara, Toshihiko Okamura, Wakako Maeda
2024 — conf
No-guard-band integration of digital coherent CV-QKD system into 400 Gbit/s 75 GHz grid DWDM systems.
OFC
Tetsuo Kawakami, Hiroki Kawahara, Toshihiko Okamura, Ken-ichiro Yoshino, Wakako Maeda
2024 — conf
Remote Ship Control through Head Mounted Display (HMD) Based User Experience.
ICCCM
Kaito Yamao, Hiroki Kawahara, Masayuki Kashima, Takayasu Fuchida, Kentaro Oda
2023 J jnl
Highly Efficient Multi-Band Optical Networks with Wavelength-Selective Band Switching.
IEICE Trans. Commun.
Masahiro Nakagawa, Hiroki Kawahara, Takeshi Seki, Takashi Miyamura
2023 J jnl
Level Allocation of Four-Level Pulse-Amplitude Modulation Signal in Optically Pre-Amplified Receiver Systems.
IEICE Trans. Commun.
Hiroki Kawahara, Koji Igarashi, Kyo Inoue
2022 — conf
Magic Drops: Food 3D Printing of Colored Liquid Balls by Ultrasound Levitation.
UIST (Adjunct Volume)
Hiroki Kawahara, Kaito Yamao, Kentaro Oda
2021 — conf
Adaptive Link-by-Link Band Allocation: A Novel Adaptation Scheme in Multi-Band Optical Networks.
ONDM
Masahiro Nakagawa, Hiroki Kawahara, Takeshi Seki, Takashi Miyamura
2021 J jnl
Analysis of Signal Distribution in ASE-Limited Optical On-Off Keying Direct-Detection Systems.
IEICE Trans. Commun.
Hiroki Kawahara, Kyo Inoue, Koji Igarashi
2021 J jnl
Real-Time Experiment and Numerical Analysis of Highly-Survivable Adaptive Restoration for High-Capacity Optical Signal Transmission.
IEICE Trans. Commun.
Hiroki Kawahara, Kohei Saito, Masahiro Nakagawa, Takashi Kubo, Takeshi Seki, Takeshi Kawasaki, Hideki Maeda
2020 J jnl
Dual-Carrier 1-Tb/s Transmission Over Field-Deployed G.654.E Fiber Link Using Real-Time Transponder.
IEICE Trans. Commun.
Fukutaro Hamaoka, Takeo Sasai, Kohei Saito, Takayuki Kobayashi, Asuka Matsushita, Masanori Nakamura, Hiroki Taniguchi, Shoichiro Kuwahara, Hiroki Kawahara, Takeshi Seki, Josuke Ozaki, Yoshihiro Ogiso, Hideki Maeda, Yoshiaki Kisaka, Masahito Tomizawa
2020 — conf
Experimental Demonstration of Wavelength-Selective Band/Direction-Switchable Multi-Band OXC Using an Inter-Band All-Optical Wavelength Converter.
ECOC
Hiroki Kawahara, Masahiro Nakagawa, Takeshi Seki, Takashi Miyamura
2020 — conf
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.
OFC
Kohei Saito, Takeo Sasai, Fukutaro Hamaoka, Hiroki Kawahara, Takeshi Seki, Hideki Maeda
2020 — conf
Real-Time Demonstration of 500-Gbps/Lambda and 600-Gbps/Lambda WDM Transmission on Field-Installed Fibers.
OFC
Hideki Maeda, Hiroki Kawahara, Kohei Saito, Takeshi Seki, Takeo Sasai, Fukutaro Hamaoka
2020 — conf
The Impact of Nonlinear Phase Noise Induced from Low-Speed Optical Supervisory Channel on Soft-Decision FEC Performance.
OFC
Hiroki Kawahara, Kohei Saito, Takeshi Seki, Takeshi Kawasaki, Hideki Maeda
2019 — conf
Dual-Carrier 1-Tb/s Transmission Over Field-Deployed Large-Core Pure-Silica-Core Fiber Link Using Real-Time Transponder.
OECC/PSC
Fukutaro Hamaoka, Takeo Sasai, Kohei Saito, Takayuki Kobayashi, Asuka Matsushita, Masanori Nakamura, Hiroki Taniguchi, Shoichiro Kuwahara, Hiroki Kawahara, Takeshi Seki, Josuke Ozaki, Yoshihiro Ogiso, Hideki Maeda, Yoshiaki Kisaka, Masahito Tomizawa
2019 — conf
Numerical Analysis of Adaptive Restoration in Optical Transport Networks.
OECC/PSC
Masahiro Nakagawa, Hiroki Kawahara, Kana Masumoto, Hidetoshi Onda, Kazuyuki Matsumura
2019 — conf
Real-time demonstration of 600Gbps/carrier WDM transmission and highly-survivable adaptive restoration on field installed fiber.
OECC/PSC
Hiroki Kawahara, Kohei Saito, Masahiro Nakagawa, Takashi Kubo, Takeshi Seki, Takeshi Kawasaki, Hideki Maeda, Tomohiro Sekino, Naoki Bannai, Masaki Shinkai, Tomoki Sakamaki, Kenjiro Yamanaka, Takashi Kurimoto
2019 — conf
Throughput Enhancement with Overlay Network Virtualization Using Commodity Devices.
UCC Companion
Hiroki Kawahara, Ryo Yamamoto, Satoshi Ohzahata, Toshihiko Kato
2018 — conf
Integrated Wavelength Selective Switch Array for Space Division Multiplexed Network with Ultra-Low Inter-Spatial Channel Crosstalk.
OFC
Keita Yamaguchi, Kazunori Seno, Kenya Suzuki, Hiroki Kawahara, Mitsunori Fukutoku, Toshikazu Hashimoto, Yutaka Miyamoto
2017 — conf
SDM-compatible dynamic gain equalizer using spatial and planar optical circuit.
OFC
Mitsumasa Nakajima, Kenya Suzuki, Keita Yamaguchi, Hirotaka Ono, Hiroki Kawahara, Mitsunori Fukutoku, Takayuki Mizuno, Yutaka Miyamoto, Toshikazu Hashimoto