Mr. Takasi Simoyama Profile

Takasi Simoyama

at Fujitsu Labs Ltd

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Author

Publications (6)

Proceedings Article | 12 March 2024 Presentation + Paper

Waveguide-coupled germanium lateral uni-traveling-carrier photodetector for coherent applications at 130 Gbaud and beyond

Jianping Wang, Takasi Simoyama, Akira Oka, Mario Alberto Serrano-Núñez, Yoshihiko Yoshida, Kiyomasa Doi, Ayahito Uetake, Shuntaro Makino, Akira Ishii, Suguru Akiyama

Proceedings Volume 12891, 128910L (2024) https://doi.org/10.1117/12.3001629

KEYWORDS: Optical coherence, Photodetectors, Waveguides, Germanium, Silicon, Capacitance, Silicon photonics, Tolerancing, Integrated photonics, Photocurrent, Dark current

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Proceedings Article | 9 February 2012 Paper

AlGaInAs semi-insulating buried-heterostructure distributed reflector lasers for low-driving-current high-speed direct modulation

Takasi Simoyama, Manabu Matsuda, Shigekazu Okumura, Ayahito Uetake, Mitsuru Ekawa, Tsuyoshi Yamamoto

Proceedings Volume 8277, 82770B (2012) https://doi.org/10.1117/12.906607

KEYWORDS: Reflectors, Mirrors, Light sources, Eye, Modulation, Waveguides, Fiber lasers, Semiconductor lasers, Laser damage threshold, Laser sintering

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Proceedings Article | 25 July 2003 Paper

Ultrafast gain and index in semiconductor optical amplifier: theory and experiment

Harm Dorren, Xuelin Yang, Daan Lenstra, H. de Waardt, Giok-Djan Khoe, Takasi Simoyama, Hiroshi Ishikawa, Hitoshi Kawashima, Toshifumi Hasama

Proceedings Volume 4986, (2003) https://doi.org/10.1117/12.482319

KEYWORDS: Ultrafast phenomena, Refractive index, Optical amplifiers, Semiconductor optical amplifiers, Switching, Polarization, Attenuators, Picosecond phenomena, Phase shifts, Absorption

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Proceedings Article | 30 May 2003 Paper

Realization of ultrafast and low-power all-optical switches using intersubband transitions in a novel InGaAs/AlAs/AlAsSb quantum well structure

Teruo Mozume, Jun-ichi Kasai, Nikolai Georgiev, Takasi Simoyama, Achanta Gopal, Haruhiko Yoshida

Proceedings Volume 4992, (2003) https://doi.org/10.1117/12.475706

KEYWORDS: Indium gallium arsenide, Quantum wells, Statistical analysis, Switching, Scattering, Interfaces, Picosecond phenomena, Antimony, Gallium, Absorption

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Proceedings Article | 14 May 2002 Paper

Large intersubband nonlinearity for all-optical switching at 1.72 micron in Sb-based quantum wells

A. Gopal, Haruhiko Yoshida, Arup Neogi, Teruo Mozume, Nikolai Georgiev, Takasi Simoyama, Osamu Wada, Hiroshi Ishikawa

Proceedings Volume 4638, (2002) https://doi.org/10.1117/12.467468

KEYWORDS: Semiconductors, Quantum wells, Switches, Continuous wave operation, Switching, Nonlinear optics, Solids, Shape analysis, Excitons, Absorption

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Proceedings Article | 9 July 2001 Paper

Wavelength conversion using four-wave mixing with two nondegenerated pumps in a wavelength-selectable laser

Takasi Simoyama, Haruhiko Kuwatsuka, Martin Bouda, Manabu Matsuda, Yuji Kotaki, Hiroshi Ishikawa

Proceedings Volume 4283, (2001) https://doi.org/10.1117/12.432612

KEYWORDS: Semiconductors, Quantum wells, Switching, Waveguides, Fiber lasers, Semiconductor lasers, Terahertz radiation, Brain-machine interfaces, Four wave mixing, Hole burning spectroscopy

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Showing 5 of 6 publications

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