K
Koji Igarashi
Researcher at Osaka University
Publications - 182
Citations - 2751
Koji Igarashi is an academic researcher from Osaka University. The author has contributed to research in topics: Wavelength-division multiplexing & Optical fiber. The author has an hindex of 25, co-authored 163 publications receiving 2180 citations. Previous affiliations of Koji Igarashi include University of Tokyo.
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Journal ArticleDOI
A coherent Ising machine for 2000-node optimization problems.
Takahiro Inagaki,Yoshitaka Haribara,Yoshitaka Haribara,Koji Igarashi,Tomohiro Sonobe,Tomohiro Sonobe,Shuhei Tamate,Toshimori Honjo,Alireza Marandi,Peter L. McMahon,Takeshi Umeki,Koji Enbutsu,Osamu Tadanaga,Hirokazu Takenouchi,Kazuyuki Aihara,Ken-ichi Kawarabayashi,Ken-ichi Kawarabayashi,Kyo Inoue,Shoko Utsunomiya,Hiroki Takesue +19 more
TL;DR: It is shown that an optical processing approach based on a network of coupled optical pulses in a ring fiber can be used to model and optimize large-scale Ising systems, and a coherent Ising machine outperformed simulated annealing in terms of accuracy and computation time for a 2000-node complete graph.
Proceedings ArticleDOI
10.16 Peta-bit/s Dense SDM/WDM transmission over Low-DMD 6-Mode 19-Core Fibre Across C+L Band
Daiki Soma,Yuta Wakayama,Shohei Beppu,Seiya Sumita,Takehiro Tsuritani,Tetsuya Hayashi,Takuji Nagashima,Masato Suzuki,Hidenori Takahashi,Koji Igarashi,Itsuro Morita,Masatoshi Suzuki +11 more
TL;DR: Over 10 peta-bit/s transmission has been experimentally demonstrated for the first time using 11.3-km-length low-DMD 6-mode 19-core fibre across C+L band.
Journal ArticleDOI
Unrepeated 200-km transmission of 40-Gbit/s 16-QAM signals using digital coherent receiver.
TL;DR: This work demonstrates unrepeated 200-km transmission of 40-Gbit/s 16-QAM signals using a digital coherent receiver, where the decision-directed carrier-phase estimation is employed and the phase fluctuation is effectively eliminated.
Proceedings ArticleDOI
1.03-Exabit/s.km Super-Nyquist-WDM Transmission over 7,326-km Seven-Core Fiber
Koji Igarashi,Takehiro Tsuritani,Itsuro Morita,Yukihiro Tsuchida,Koichi Maeda,Masateru Tadakuma,Tsunetoshi Saito,Kengo Watanabe,Katsunori Imamura,Ryuichi Sugizaki,Masatoshi Suzuki +10 more
TL;DR: In this article, the authors demonstrate 140.7-Tbit/s, 7,326-km transmission of 7×201-channel 25GHz-spaced Super-Nyquist-WDM 100-Gbit/S optical signals using seven-core fiber and full C-band EDFAs, achieving a capacity-distance product of 1.03 Exabit/s·km.
Journal ArticleDOI
10.16-Peta-B/s Dense SDM/WDM Transmission Over 6-Mode 19-Core Fiber Across the C+L Band
Daiki Soma,Yuta Wakayama,Shohei Beppu,Seiya Sumita,Takehiro Tsuritani,Tetsuya Hayashi,Takuji Nagashima,Masato Suzuki,Masato Yoshida,Keisuke Kasai,Masataka Nakazawa,Hidenori Takahashi,Koji Igarashi,Itsuro Morita,Masatoshi Suzuki +14 more
TL;DR: In this article, the authors demonstrate ultradense SDM transmission of 739 WDM 12-Gbd dual polarization signals over 11.3km 6-mode 19-core fiber using the C+L band, achieving a record fiber capacity of 10.16 peta-b/s with an aggregate spectral efficiency of 1099.9 b/s/Hz.