Dr. Kyohei Iwamoto Profile

Dr. Kyohei Iwamoto

President at Sony Space Communications

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Publications (5)

Proceedings Article | 5 March 2021 Presentation + Paper

Experimental results on in-orbit technology demonstration of SOLISS

Kyohei Iwamoto, Hiromitsu Komatsu, Shinji Ohta, Yasushi Kubo, Takashi Nakao, Hiroaki Yamazoe, Toshiaki Kamata, Yasushi Munemasa, Hiroo Kunimori, Morio Toyoshima, Daiki Koda, Hirotaka Sawada, Toshitami Ikeda

Proceedings Volume 11678, 116780D (2021) https://doi.org/10.1117/12.2578089

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Proceedings Article | 5 March 2021 Presentation + Paper

Evaluation of the forward error correction format for LEO-ground optical communication using Reed-Solomon product code

Hiroaki Yamazoe, Shinji Ohta, Hiromitsu Komatsu, Kai Suzuki, Eiji Okamoto, Kyohei Iwamoto

Proceedings Volume 11678, 1167811 (2021) https://doi.org/10.1117/12.2579077

KEYWORDS: Forward error correction, Optical communications, Atmospheric optics, Free space optics, Telecommunications, Optical discs, Free space optical communications, Device simulation, Data communications, Atmospheric corrections

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In recent years, optical communication protocols resilient to atmospheric disturbances for near-Earth have been discussed in Consultative Committee for Space Data System (CCSDS). We proposed our Forward Error Correction (FEC) format to the committee to provide a better option with a balance of its complexity and performance. The FEC consists of Reed-Solomon product code (RS-PC) which is robust to burst error and has been adopted as an optical disc format because they are commonly suffering from burst error caused by scratch, fingerprint, and other materials which disturb laser light. We considered the feature was also be able to be applied to the burst error correction of fading due to atmospheric disturbance and successfully demonstrated optical Ethernet communication by using proposed FEC between International Space Station and optical ground station which is located in Japan. However, the performance of RS-PC for free-space optical communication was not discussed quantitatively yet. Here we discuss the proposed FEC format structure in detail and its Bit Error Rate (BER) curve simulated under the condition of the fading channel. We also discuss the robustness of burst error can be adjusted in correspondence with the condition of the atmosphere channel by concatenating multiple FEC blocks. Furthermore, the BER performance can be improved without changing the FEC format itself by applying iterative correction and erasure correction. The simulation result shows the proposed FEC can realize better performance compared with a single Reed- Solomon code. In terms of error correction capability, soft-decision codes such as Low Density Parity Check (LDPC) and Serial Concatenated Convolutional Codes (SCCC) provide a better performance, but the advantage of RS-PC is that it can be implemented with smaller and less power consuming circuits than these FECs. It shows the proposed FEC format can be a promising approach especially for an in-orbit solution which supports limited power resource.

Proceedings Article | 5 March 2021 Presentation + Paper

The pointing performance of the optical communication terminal, SOLISS in the experimentation of bidirectional laser communication with an optical ground station

Hiromitsu Komatsu, Shinji Ohta, Hiroaki Yamazoe, Yasushi Kubo, Takashi Nakao, Taiji Ito, Daiki Koda, Hiroaki Sawada, Toshitami Ikeda, Yasushi Munemasa, Hiroo Kunimori, Toshihiro Kubooka, Morio Toyoshima, Kyohei Iwamoto

Proceedings Volume 11678, 116780F (2021) https://doi.org/10.1117/12.2577067

KEYWORDS: Laser communications, Optical communications, Optical discs, Data communications, Telecommunications, Satellites, Satellite communications, Laser systems engineering, Laser development, Computing systems

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Proceedings Article | 2 March 2020 Presentation + Paper

In-orbit experimental architecture design of bi-directional communication with a small optical communication terminal attached on ISS and an optical ground station

Hiromitsu Komatsu, Shinji Ohta, Hiroaki Yamazoe, Yasushi Kubo, Takashi Nakao, Taiji Ito, Daiki Koda, Hirotaka Sawada, Toshitami Ikeda, Yasushi Munemasa, Hiroo Kunimori, Toshihiro Kubooka, Morio Toyoshima, Kyohei Iwamoto

Proceedings Volume 11272, 112720C (2020) https://doi.org/10.1117/12.2551257

KEYWORDS: Optical communications, Telecommunications, Free space optics, Control systems, Sensors, Satellite communications, Satellites, Cameras, Signal processing, Telescopes

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Proceedings Article | 24 February 2017 Paper

Small optical inter-satellite communication system for small and micro satellites

Kyohei Iwamoto, Takashi Nakao, Taiji Ito, Takeshi Sano, Tamotsu Ishii, Keiichi Shibata, Mitsuhiro Ueno, Shinji Ohta, Hiromitsu Komatsu, Tomohiro Araki, Yuta Kobayashi, Hirotaka Sawada

Proceedings Volume 10096, 100960T (2017) https://doi.org/10.1117/12.2251610

KEYWORDS: Satellites, Telecommunications, Satellite communications, Data communications, Control systems, Optical communications, Real-time computing, Relays, Free space optical communications, Actuators, Signal detection, Photodetectors, Optical discs

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