Mr. Tomohiro Araki Profile

Tomohiro Araki

Researcher at Japan Aerospace Exploration Agency

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Author

Publications (20)

Proceedings Article | 12 March 2024 Presentation + Paper

Preliminary design of key optical components onboard laser communication terminal of GEO data relay satellite for cislunar optical communication system

Hideaki Kotake, Yoshihiko Saito, Tomohiro Araki, Katsumi Makino, Masaru Koga, Kota Tanabe, Naoki Sato, Hiroyuki Tsuji, Morio Toyoshima

Proceedings Volume 12877, 1287713 (2024) https://doi.org/10.1117/12.2692481

KEYWORDS: Adaptive optics, Receivers, Optical antennas, Satellites, Digital signal processing, Optical communications, Laser communication terminals, Telecommunications, Wavefronts, Design

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Proceedings Article | 12 March 2024 Presentation + Paper

High power wavelength division multiplexing (HP-WDM) for high-speed space optical communication

Taiki Takamatsu, Shota Kimura, Yosuke Hashimoto, Johta Awano, Tomohiro Araki, Masanobu Yajima

Proceedings Volume 12877, 128770I (2024) https://doi.org/10.1117/12.3002175

KEYWORDS: Dielectric filters, Optical filters, Optical communications, Wavelength division multiplexing, Free space optical communications, Transmitters

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Proceedings Article | 15 March 2023 Poster + Paper

Research and development of key technologies for cislunar optical communication systems in Japan

Hideaki Kotake, Yoshihiko Saito, Tomohiro Araki, Katsumi Makino, Masaru Koga, Kota Tanabe, Naoki Sato, Hiroyuki Tsuji, Morio Toyoshima

Proceedings Volume 12413, 124131N (2023) https://doi.org/10.1117/12.2648983

KEYWORDS: Optical communications, Telecommunications, Adaptive optics, Satellites, Receivers, Optical antennas, Satellite communications, Relays, Data communications, Laser communication terminals

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Proceedings Article | 15 March 2023 Presentation + Paper

Development of a continuous wave single transverse mode polarization-maintaining 10 W Er/Yb-codoped fiber amplifier for space communications

Hiroki Kobayashi, Ryoko Kano, Takashi Seo, Yasushi Suzuki, Eiichi Mizuta, Yosuke Hashimoto, Tomohiro Araki, Yasutoshi Takada

Proceedings Volume 12413, 124130G (2023) https://doi.org/10.1117/12.2644913

KEYWORDS: Polarization maintaining fibers, High power fiber amplifiers, Free space optical communications, Space operations, Spaceflight missions, Optical communications, Vacuum, Gamma radiation, Vibration, Modulation, Fiber amplifiers

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Proceedings Article | 11 June 2021 Open Access

A trade-off study of lunar-earth optical communication links

Tomohiro Araki

Proceedings Volume 11852, 118521X (2021) https://doi.org/10.1117/12.2599331

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Proceedings Article | 12 July 2019 Open Access

Experimental results of high power double-pass, double clad EYDFA

T. Araki, E. Mizuta, Y. Kobayashi, Y. Takushima, X. Wang, S. Sekiguchi

Proceedings Volume 11180, 1118033 (2019) https://doi.org/10.1117/12.2536030

KEYWORDS: Surface plasmons, Optical amplifiers, Fermium, Frequency modulation, Optical fibers, Free space optics, Collimators, Erbium, High power fiber amplifiers, Mirrors

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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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Proceedings Article | 24 February 2017 Presentation + Paper

Ultra-sonic motor for the actuators of space optical communications terminal

T. Araki, Y. Kobayashi, N. Kawashima, K. Maniwa, S. Obara, T. Zakoji, A. Kubota

Proceedings Volume 10096, 100960M (2017) https://doi.org/10.1117/12.2250461

KEYWORDS: Astronomical imaging, Magnetism, Space operations, Data communications, RF communications, Antennas, Coating, Temperature metrology, Relays

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Proceedings Article | 15 March 2016 Paper

Digital coherent receiver technique for onboard receiver of future optical data relay system

Tomohiro Araki

Proceedings Volume 9739, 973919 (2016) https://doi.org/10.1117/12.2230423

KEYWORDS: Receivers, Relays, Optical communications, Doppler effect, Demodulation, Signal detection, Digital signal processing, Data transmission, Data communications, Telecommunications, Channel projecting optics, Modulation

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Proceedings Article | 15 March 2016 Paper

Overview of optical data relay system in JAXA

Y. Chishiki, S. Yamakawa, Y. Takano, Y. Miyamoto, T. Araki, H. Kohata

Proceedings Volume 9739, 97390D (2016) https://doi.org/10.1117/12.2217552

KEYWORDS: Relays, Free space optics, Satellites, Telecommunications, Satellite communications, Ka band, Data communications, Optical communications, Free space optical communications, Data transmission, Space operations, Earth observing sensors, Sensors

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Proceedings Article | 2 May 2000 Paper

Analysis of noises generated in high-power-operated erbium-doped fiber amplifiers and their influences on IM-DD/coherent OIC system performance

Shiro Yamakawa, Tomohiro Araki, Hisashi Morikawa

Proceedings Volume 3932, (2000) https://doi.org/10.1117/12.384310

KEYWORDS: Optical amplifiers, Interference (communication), Fiber amplifiers, Optical filters, Receivers, Optical communications, Signal to noise ratio, Modulation, Bandpass filters, Transmitters

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Proceedings Article | 26 April 1999 Paper

Trade-off between IM-DD and coherent system in high-data-rate optical interorbit links

Shiro Yamakawa, Tomohiro Araki, Yasumasa Hisada

Proceedings Volume 3615, (1999) https://doi.org/10.1117/12.346205

KEYWORDS: Optical amplifiers, Telecommunications, Interference (communication), Heterodyning, Oscillators, Modulation, Optical filters, Receivers, Frequency shift keying, Amplitude shift keying

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Proceedings Article | 27 May 1998 Paper

Small-size two-axis mechanical devices for FPM and PAM using piezoelectronic actuators

Mamoru Furuya, Tomohiro Araki, Shiro Yamakawa, Yasumasa Hisada, Fumika Kondo, Toshikatsu Akiba

Proceedings Volume 3266, (1998) https://doi.org/10.1117/12.308696

KEYWORDS: Actuators, Optical fibers, Mirrors, Receivers, Telecommunications, Optical communications, Data communications, Magnetism, Control systems, Fiber optic communications

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We have developed two kinds of small size and light weight mechanical devices which consist of 2-axis piezoelectronic driving actuators and elastic hinges for fine pointing mechanism (FPM) and point ahead mechanism (PAM) optical inter- orbit communication (optical IOC) equipment. These are 'Beam Trapping Mechanism (BTM)' and 'Beam Scanning Mechanism (BSM)' respectively. High sensitivity receive system using single- mode optical fiber should be needed to increase communication data rate, which are a receiver of heterodyne detection in optical fiber and a receiver using optical pre-amplifier (for example, Er doped fiber amplifier). Therefore, both improvement of precision of FPM and control of the end of optical fiber are needed. In order to realize these requirements, we have designed, developed and tested two kinds of mechanical devices. At first, results of BTM, which consists of an optical fiber, four piezoelectric actuators, elastic hinges and a housing which mounts them, are described. The end facet of optical fiber supported by elastic hinges is controlled by piezoelectronic actuators in order to trap spatial received beam into optical fiber with high efficiency and high speed. The functional test results of BTM show a moving range of 140 (mu) rad, a resolution of less than 0.2 (mu) rad and natural frequency of 390 Hz. These values show BTM has enough performance for low-loss received beam trapping into optical fiber core. Furthermore, small-sized and lightweight BTM was realized using piezoelectronic actuators. We designed a BSM which has function of piezoelectronic driving 2-axis FPM in order to improve FPM. BSM have mirror of which size is 15 * 12 mm². The mechanical concept of BSM is as same as BTM. In BSM, mirror is supported by elastic hinges, replace with optical fiber. Function test results show scanning angle range of more than 2.8 mrad at azimuth direction, 2.0 mrad at elevation direction, scanning resolution of 1.0 (mu) rad and natural frequency is 1.1 kHz. Furthermore, BSM is smaller and lighter compared with electro- magnetic devices.

Proceedings Article | 27 May 1998 Paper

Latest results and trade-off of high-power optical fiber amplifiers for optical interorbit communications

Tomohiro Araki, Shiro Yamakawa, Mamoru Furuya, Yasumasa Hisada

Proceedings Volume 3266, (1998) https://doi.org/10.1117/12.308716

KEYWORDS: Optical amplifiers, High power fiber amplifiers, Optical fibers, Reliability, Optical communications, Fiber amplifiers, Wavelength division multiplexing, Fiber optic communications, Transmitters, Ytterbium

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Proceedings Article | 24 April 1997 Paper

Trial manufacturing results and characteristics of InGaAs-quadrant detectors (QD) as a fine pointing sensor

Tomohiro Araki, Mamoru Furuya, Yasumasa Hisada

Proceedings Volume 2990, (1997) https://doi.org/10.1117/12.273692

KEYWORDS: Sensors, Optical amplifiers, Optics manufacturing, Telecommunications, Optical communications, Manufacturing, Data communications, Transmitters, Fiber amplifiers, Photonics

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Proceedings Article | 24 April 1997 Paper

Double-clad Nd-doped fiber amplifiers for transmitter of interorbit communications

Yoshihito Hirano, Yasuhiro Shoji, Kenji Tatsumi, Minoru Yoshida, Tomohiro Araki, Yasumasa Hisada

Proceedings Volume 2990, (1997) https://doi.org/10.1117/12.273699

KEYWORDS: Fiber amplifiers, Optical amplifiers, Absorption, Scattering, Neodymium, Transmitters, Semiconductor lasers, Single mode fibers, Signal attenuation, Fiber lasers

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Proceedings Article | 22 April 1996 Paper

High-power optical amplifier for optical interorbit communications

Tomohiro Araki, Yasumasa Hisada, Yukimasa Tajima

Proceedings Volume 2699, (1996) https://doi.org/10.1117/12.238427

KEYWORDS: Optical amplifiers, Fiber lasers, Transmitters, Optical fibers, Modulation, Thermal effects, Optical communications, Single mode fibers, Fiber amplifiers, High power lasers

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Proceedings Article | 20 April 1995 Paper

Laser transmitter systems for high-data-rate optical interorbit communications

Tomohiro Araki, Masanobu Yajima, Shigeharu Nakamori, Yasumasa Hisada

Proceedings Volume 2381, (1995) https://doi.org/10.1117/12.207409

KEYWORDS: Optical amplifiers, Transmitters, Optical communications, Telecommunications, High power lasers, Atmospheric optics, Nd:YAG lasers, Modulation, Laser systems engineering, Data communications

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Proceedings Article | 16 August 1994 Paper

Present and future of optical intersatellite communication research at the National Space Development Agency of Japan (NASDA)

Tomohiro Araki, Shigeharu Nakamori, Yasumasa Hisada, Toshiyuki Fukuda

Proceedings Volume 2123, (1994) https://doi.org/10.1117/12.184639

KEYWORDS: Optical communications, Satellites, Satellite communications, Optical amplifiers, Telecommunications, Optical fabrication, Optical antennas, Data communications, Acquisition tracking and pointing, RF communications

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Proceedings Article | 6 June 1993 Paper

Output characteristics of high-pressure 585.3-nm atomic neon laser pumped by transverse discharge

Chuen-Huei Yang, Koji Itoh, Tomohiro Araki, Fumihiko Kannari, Minoru Obara

Proceedings Volume 1871, (1993) https://doi.org/10.1117/12.145240

KEYWORDS: Neon, Laser energy, Gold vapor lasers, Laser therapeutics, Luminescence, Photodynamic therapy, Capacitors, Hydrogen, Laser scattering, Dye lasers

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Showing 5 of 20 publications

Conference Committee Involvement (1)

Free-Space Laser Communications Technologies XV

28 January 2003 | San Jose, CA, United States

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