Mr. Yoshisada Koyama Profile

Yoshisada Koyama

at NICT

SPIE Involvement:

Author

Proceedings Article | 12 July 2019 Open Access

Development of “HICALI”: high speed optical feeder link system between GEO and ground

T. Kubo-oka, H. Kunimori, K. Suzuki, Y. Koyama, K. Shiratama, Y. Munemasa, H. Takenaka, D. Kolev, A. Carrasco Casado, T. Phuc, M. Toyoshima

Proceedings Volume 11180, 1118060 (2019) https://doi.org/10.1117/12.2536135

KEYWORDS: Optical communications, Satellite communications, Satellites, Telecommunications, Adaptive optics, Telescopes, Atmospheric optics, Astronomical imaging, Data communications, RF communications

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Proceedings Article | 12 July 2019 Open Access

Research and Development of a Transportable Ground Optical Station in NICT

Yoshihiko Saito, Yasushi Munemasa, Hideki Takenaka, Hiroo Kunimori, Dimitar Kolev, Alberto Carrasco-Casado, Yoshisada Koyama, Koichi Shiratama, Toshihiro Kubo-oka, Morio Toyoshima

Proceedings Volume 11180, 111805S (2019) https://doi.org/10.1117/12.2536127

KEYWORDS: Telescopes, Free space optics, Active optics, Satellites, Optical communications, Satellite communications, Roads, Optical benches, Telecommunications, Receivers

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Proceedings Article | 15 February 2018 Presentation + Paper

Design status of the development for a GEO-to-ground optical feeder link, HICALI

Yasushi Munemasa, Tetsuharu Fuse, Toshihiro Kubo-oka, Hiroo Kunimori, Dimitar Kolev, Alberto Carrasco-Casado, Hideki Takenaka, Yoshihiko Saito, Phuc Viet Trinh, Kenji Suzuki, Yoshisada Koyama, Morio Toyoshima

Proceedings Volume 10524, 105240F (2018) https://doi.org/10.1117/12.2291881

KEYWORDS: Satellites, Telecommunications, Satellite communications, Optical communications, Laser communications, Ka band, Laser development, Data communications, RF communications, Radio optics

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Proceedings Article | 25 September 2017 Open Access

Development of a breadboard model of space laser communication terminal for optical feeder links from Geo

T. Fuse, M. Akioka, D. Kolev, Y. Koyama, T. Kubo-oka, H. Kunimori, K. Suzuki, H. Takenaka, Y. Munemasa, M. Toyoshima

Proceedings Volume 10562, 105622X (2017) https://doi.org/10.1117/12.2296224

KEYWORDS: Laser communications, Satellites, Optics manufacturing, Satellite communications, Data communications, Astronomical imaging, Optical communications, Aerospace engineering, Communication and information technologies, Manufacturing

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Proceedings Article | 25 September 2017 Open Access

Experimental results of satellite-to-ground laser communications link through atmospheric turbulence using SOTA

Hideki Takenaka, Dimitar Kolev, Yoshisada Koyama, Maki Akioka, Yasushi Munemasa, Hiroo Kunimori, Morio Toyoshima

Proceedings Volume 10562, 105624A (2017) https://doi.org/10.1117/12.2296179

KEYWORDS: Satellites, Space telescopes, Telescopes, Sensors, Satellite communications, Astronomical imaging, Laser communications, Optical communications, Data communications, Scintillation

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Proceedings Article | 25 September 2017 Open Access

On-orbit evaluation of satellite-ground laser communication experiment using small optical transponder (SOTA) equipment –Optical Antenna

Yasushi Munemasa, Maki Akioka, Yoshisada Koyama, Hiroo Kunimori, Morio Toyoshima

Proceedings Volume 10562, 1056249 (2017) https://doi.org/10.1117/12.2296176

KEYWORDS: Satellites, Satellite communications, Optical antennas, Antennas, Laser communications, Optical communications, Transmitters, Sensors, Atmospheric optics, Astronomical imaging

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Proceedings Article | 15 March 2016 Paper

In-orbit verification of small optical transponder (SOTA): evaluation of satellite-to-ground laser communication links

Hideki Takenaka, Yoshisada Koyama, Maki Akioka, Dimitar Kolev, Naohiko Iwakiri, Hiroo Kunimori, Alberto Carrasco-Casado, Yasushi Munemasa, Eiji Okamoto, Morio Toyoshima

Proceedings Volume 9739, 973903 (2016) https://doi.org/10.1117/12.2214461

KEYWORDS: Free space optics, Satellites, Transponders, Satellite communications, Optical communications, Laser communications, Atmospheric propagation, Error analysis, Forward error correction, Sensors, Optical design, Atmospheric optics

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Proceedings Article | 6 March 2014 Paper

Introduction of a terrestrial free-space optical communications network facility: IN-orbit and Networked Optical ground stations experimental Verification Advanced testbed (INNOVA)

Morio Toyoshima, Yasushi Munemasa, Hideki Takenaka, Yoshihisa Takayama, Yoshisada Koyama, Hiroo Kunimori, Toshihiro Kubooka, Kenji Suzuki, Shinichi Yamamoto, Shinichi Taira, Hiroyuki Tsuji, Isao Nakazawa, Maki Akioka

Proceedings Volume 8971, 89710R (2014) https://doi.org/10.1117/12.2044181

KEYWORDS: Optical communications, Free space optical communications, Optical networks, Data communications, Satellites, Free space optics, Satellite communications, Telecommunications, Data centers, Control systems

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Proceedings Article | 10 February 2012 Paper

Current development status of Small Optical TrAnsponder (SOTA) for satellite-ground laser communications

Yoshihisa Takayama, Morio Toyoshima, Yoshisada Koyama, Hideki Takenaka, Maki Akioka, Koichi Shiratama, Ichiro Mase, Osamu Kawamoto

Proceedings Volume 8246, 824607 (2012) https://doi.org/10.1117/12.913254

KEYWORDS: Satellites, Satellite communications, Laser communications, Transponders, Sensors, Data communications, Modulation, Optical communications, Quantum key distribution, Optical tracking

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Proceedings Article | 12 September 2011 Paper

Atomic frequency standards at NICT

T. Ido, M. Fujieda, H. Hachisu, K. Hayasaka, M. Kajita, R. Kojima, M. Kumagai, C. Locke, Y. Li, K. Matsubara, A. Nogami, N. Shiga, A. Yamaguchi, Y. Koyama, M. Hosokawa, Y. Hanado

Proceedings Volume 8132, 81320D (2011) https://doi.org/10.1117/12.892887

KEYWORDS: Clocks, Chemical species, Ions, Standards development, Cesium, Calcium, Laser stabilization, Microwave radiation, Oscillators, Communication and information technologies

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Proceedings Article | 26 February 2010 Paper

Expanded laser communications demonstrations with OICETS and ground stations

Yoshihisa Takayama, Morio Toyoshima, Yozo Shoji, Yoshisada Koyama, Hiroo Kunimori, Minoru Sakaue, Shiro Yamakawa, Yoshiyuki Tashima, Nobuhiro Kura

Proceedings Volume 7587, 75870D (2010) https://doi.org/10.1117/12.845991

KEYWORDS: Satellites, Laser communications, Satellite communications, Aerospace engineering, Communication and information technologies, Communication engineering, Data communications, Atmospheric optics, Sensors, Meteorological satellites

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Proceedings Article | 18 April 2005 Paper

Components development for NeLS optical terminal

Yoshisada Koyama, Eihisa Morikawa, Hiroo Kunimori, Koichi Shiratama, Yasuhiko Yasuda

Proceedings Volume 5712, (2005) https://doi.org/10.1117/12.591242

KEYWORDS: Signal processing, Sensors, Receivers, Temperature metrology, Collimators, Field programmable gate arrays, Telecommunications, Optical components, Photography, Optical antennas

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Proceedings Article | 16 June 2004 Paper

Optical terminal for NeLS in-orbit demonstration

Yoshisada Koyama, Eihisa Morikawa, Koichi Shiratama, Ryutaro Suzuki, Yasuhiko Yasuda

Proceedings Volume 5338, (2004) https://doi.org/10.1117/12.528778

KEYWORDS: Satellites, Signal processing, Optical communications, Data communications, Optical design, Optical antennas, Acquisition tracking and pointing, Telecommunications, Satellite communications, Transmitters

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Proceedings Article | 3 July 2003 Paper

Evaluation of a high-power optical amplifier for intersatellite links

Yoshisada Koyama, Mitsue Aizono, Eihisa Morikawa, Ryutaro Suzuki, Yasuhiko Yasuda

Proceedings Volume 4975, (2003) https://doi.org/10.1117/12.483834

KEYWORDS: Optical amplifiers, Satellites, Wavelength division multiplexing, Telecommunications, Satellite communications, Multiplexers, Multimedia, Antennas, Optical filters

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Proceedings Article | 15 July 1999 Paper

Acquisition, tracking, and pointing systems of OICETS for free space laser communications

Takashi Jono, Masahiro Toyoda, Keizo Nakagawa, Akio Yamamoto, Koichi Shiratama, Toshihiro Kurii, Yoshisada Koyama

Proceedings Volume 3692, (1999) https://doi.org/10.1117/12.352886

KEYWORDS: Sensors, Control systems, Satellites, Telecommunications, Laser communications, Acquisition tracking and pointing, Satellite communications, Free space optical communications, Aerospace engineering, Laser systems engineering

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Showing 5 of 15 publications

Conference Committee Involvement (4)

Free-Space Laser Communication Technologies XXI

28 January 2009 | San Jose, California, United States

Free-Space Laser Communication Technologies XX

24 January 2008 | San Jose, California, United States

Free-Space Laser Communication Technologies XIX

25 January 2007 | San Jose, California, United States

Free-Space Laser Communication Technologies XVIII

24 January 2006 | San Jose, California, United States

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