Zobrazeno 1 - 10
of 84
pro vyhledávání: '"Hideki TAKENAKA"'
Autor:
Phuc V. Trinh, Alberto Carrasco-Casado, Hideki Takenaka, Mikio Fujiwara, Mitsuo Kitamura, Masahide Sasaki, Morio Toyoshima
Publikováno v:
Communications Physics, Vol 5, Iss 1, Pp 1-18 (2022)
This study confirms that a classical channel model can be used for describing random fluctuations in LEO-to-ground quantum atmospheric channels. It shows that practical engineering designs for future QKD missions can be conveniently conducted using t
Externí odkaz:
https://doaj.org/article/d242d01972894120b777b26ebbba4f0b
Autor:
Shingo Fujita, Eiji Okamoto, Hideki Takenaka, Hiroyuki Endo, Mikio Fujiwara, Mitsuo Kitamura, Ryosuke Shimizu, Masahide Sasaki, Morio Toyoshima
Publikováno v:
Photonics, Vol 10, Iss 4, p 462 (2023)
Free-space optical (FSO) communications can offer high-capacity transmission owing to the properties of the laser beams. However, performance degradation caused by atmospheric turbulence is an urgent issue. Recently, the application of polar codes, w
Externí odkaz:
https://doaj.org/article/15d039ae0a2e4ab48c67b69f67a520c1
Autor:
Yoshihiko Saito, Hideki Takenaka, Koichi Shiratama, Yasushi Munemasa, Alberto Carrasco-Casado, Phuc V. Trinh, Kenji Suzuki, Tetsuharu Fuse, Yasuhiro Takahashi, Toshihiro Kubo-oka, Morio Toyoshima
Publikováno v:
Frontiers in Physics, Vol 9 (2021)
In recent years, the necessity of free-space optical (FSO) communications has increased as a method for realizing high-speed communications between satellites and the ground. However, one disadvantage of FSO communications is the significant influenc
Externí odkaz:
https://doaj.org/article/10f3fd2b4667453fb2938f9e516ce5fc
Autor:
Morio Toyoshima, Hideki Takenaka, Yozo Shoji, Yoshihisa Takayama, Masahiro Takeoka, Mikio Fujiwara, Masahide Sasaki
Publikováno v:
International Journal of Optics, Vol 2011 (2011)
Satellite quantum key distribution is a promising technique that overcomes the limited transmission distance in optical-fiber-based systems. The polarization tracking technique is one of the key techniques in the satellite quantum key distribution. W
Externí odkaz:
https://doaj.org/article/fb92b78f790b4295b7e69eab67685b5e
Publikováno v:
Transactions of the Japan Society of Aeronautical & Space Science; 2024, Vol. 67 Issue 4, p187-202, 16p
Autor:
Shoken Ishii, Kodai Kishibuchi, Hideki Takenaka, Yoshitaka Jin, Tomoaki Nishizawa, Nobuo Sugimoto, Hironari Iwai, Makoto Aoki, Seiji Kawamura, Hajime Okamoto
Publikováno v:
Applied optics. 61(27)
A compact and simple 355-nm direct-detection Doppler wind lidar (DDDWL) was developed to measure the line-of-sight (LOS) wind speed of the background atmosphere from atmospheric molecule return signals with and without aerosols and clouds. A receiver
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c6e0952990d3f444f487dbec6d4e67a7
https://pubmed.ncbi.nlm.nih.gov/36255913
https://pubmed.ncbi.nlm.nih.gov/36255913
Autor:
Hiroo Kunimori, Tetsuharu Fuse, Toshinori Kuwahara, Shinya Fujita, M. Toyoshima, Hideki Takenaka, Toshihiro Kubooka
Publikováno v:
International Conference on Space Optics — ICSO 2020.
In recent years, spatial optical communication has been attracting attention as a large-capacity communication method that connects satellites and the ground. Radiofrequency communications are used as a method for transmitting data acquired by satell
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e4e3040cf1b244a0092359b46a9408e6
https://doi.org/10.1117/12.2599372
https://doi.org/10.1117/12.2599372
Autor:
Hiroyuki Endo, Shingo Fujia, Ryosuke Shimizu, Masahide Sasaki, Mikio Fujiwara, M. Toyoshima, Hiroo Kunimori, Eiji Okamoto, Hideki Takenaka
Publikováno v:
International Conference on Space Optics — ICSO 2020.
Satellite laser communication is a promising solution to satisfy the increasing demand for high-capacity wireless communications. Satellite laser communication has several advantages over its radio frequency counterparts, such as a higher capacity wi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::03a196cfe6c9def3a8cf80b4b0ea9e85
https://doi.org/10.1117/12.2599963
https://doi.org/10.1117/12.2599963
Publikováno v:
International Conference on Space Optics — ICSO 2020.
Quantum key distribution (QKD) is a technology to securely share keys against any attack physically permitted, with the principle of quantum mechanics. In recent years, the satellite QKD, which employs artificial satellites as trusted mobile nodes, h
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dac3886160104bffbecd38eec135b38c
https://doi.org/10.1117/12.2599964
https://doi.org/10.1117/12.2599964
Autor:
Tetsuharu Fuse, Yasuhiro Takahashi, Yoshihiko Saito, Alberto Carrasco-Casado, Hideki Takenaka, Yasushi Munemasa, Kenji Suzuki, Phuc V. Trinh, Morio Toyoshima, Toshihiro Kubooka, Koichi Shiratama
Publikováno v:
Frontiers in Physics, Vol 9 (2021)
In recent years, the necessity of free-space optical (FSO) communications has increased as a method for realizing high-speed communications between satellites and the ground. However, one disadvantage of FSO communications is the significant influenc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fe5717a01bec130b4db51f45b2a77329
https://doi.org/10.3389/fphy.2021.636696
https://doi.org/10.3389/fphy.2021.636696