Prof. Ryosuke Shimizu Profile

Prof. Ryosuke Shimizu

at Univ of Electro-Communications

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Author

Publications (5)

Proceedings Article | 12 March 2024 Presentation + Paper

Single-photon-level femtosecond time-resolved measurement by asynchronous optical sampling with dual-wavelength comb

Hajime Komori, Prasad Koviri, Masahiro Ishizeki, Haochen Tian, Thomas Schibli, Takashi Kato, Akifumi Asahara, Ryosuke Shimizu, Kaoru Minoshima

Proceedings Volume 12875, 1287508 (2024) https://doi.org/10.1117/12.3001570

KEYWORDS: Pulse signals, Ultrafast phenomena, Femtosecond phenomena, Signal detection, Repetition frequency, Photon counting, Optical testing, Ultrafast measurement systems, Single photon detectors

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Proceedings Article | 8 March 2024 Presentation + Paper

Ultrafast time-resolved single-photon detection using two-color comb based asynchronous optical sampling for quantum applications

Prasad Koviri, Hajime Komori, Masahiro Ishizeki, Haochen Tian, Takashi Kato, Akifumi Asahara, Ryosuke Shimizu, Thomas Schibli, Kaoru Minoshima

Proceedings Volume 12895, 1289504 (2024) https://doi.org/10.1117/12.3002098

KEYWORDS: Ultrafast phenomena, Ultrafast measurement systems, Quantum measurement, Quantum optics, Quantum entanglement, Fiber lasers

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Proceedings Article | 11 June 2021 Open Access

Performance analysis of polar-code transmission experiments over 7.8-km terrestrial free-space optical link using channel equalization

Shingo Fujia, E. Okamoto, H. Takenaka, H. Kunimori, H. Endo, M. Fujiwara, R. Shimizu, M. Sasaki, M. Toyoshima

Proceedings Volume 11852, 118525K (2021) https://doi.org/10.1117/12.2599963

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Proceedings Article | 9 October 2019 Presentation + Paper

Free-space optical secret key agreement with post-selection based on channel state information

Hiroyuki Endo, Mikio Fujiwara, Mitsuo Kitamura, Orie Tsuzuki, Ryosuke Shimizu, Masahiro Takeoka, Masahide Sasaki

Proceedings Volume 11153, 111530K (2019) https://doi.org/10.1117/12.2532232

KEYWORDS: Free space optics, Information security, Network security, Optical information security

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Proceedings Article | 17 November 2017 Open Access

Coupling efficiency of laser beam to multimode fiber for free space optical communication

Suguru Arisa, Yoshihisa Takayama, Hiroyuki Endo, Ryosuke Shimizu, Mikio Fujiwara, Masahide Sasaki

Proceedings Volume 10563, 105630Y (2017) https://doi.org/10.1117/12.2304222

KEYWORDS: Telecommunications, Free space optics, Atmospheric propagation, Atmospheric turbulence, Optical communications, Receivers, Multimode fibers, Atmospheric optics, Astronomical imaging, Free space optical communications

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