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Your search keyword '"Mizuno, Yosuke"' showing total 27 results
Start Over Author "Mizuno, Yosuke" Journal proceedings of spie
27 results on '"Mizuno, Yosuke"'

2. The Japanese vision for the Black Hole Explorer mission

Author

Coyle, Laura E., Matsuura, Shuji, Perrin, Marshall D., Akiyama, Kazunori, Niinuma, Kotaro, Hada, Kazuhiro, Doi, Akihiro, Hagiwara, Yoshiaki, Higuchi, Aya E., Honma, Mareki, Kawashima, Tomohisa, Kolev, Dimitar, Koyama, Shoko, Masui, Sho, Ohsuga, Ken, Sano, Hidetoshi, Takami, Hideki, Tsunetoe, Yuh, Uzawa, Yoshinori, Akahori, Takuya, Akiyama, Yuto, Galison, Peter, Hayashi, Takayuki J., Hirota, Tomoya, Inoue, Makoto, Iwata, Yuhei, Johnson, Michael D., Kino, Motoki, Kofuji, Yutaro, Mizuno, Yosuke, Moriyama, Kotaro, Nagai, Hiroshi, Nakamura, Kenta, Notsu, Shota, Ono, Fumie, Oya, Yoko, Oyama, Tomoaki, Rana, Hannah, Saida, Hiromi, Saito, Ryo, Saito, Yoshihiko, Sasada, Mahito, Sawada-Satoh, Satoko, Takahashi, Mikiya M., Takamura, Mieko, Tong, Edward, Tsuji, Hiroyuki, Yoshioka, Shogo, and Watanabe, Yoshimasa

Published
2024
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20. Influence of core diameter and length of polymer optical fiber on Brillouin scattering properties

Author

Mizuno, Yosuke, Ishigure, Takaaki, and Nakamura, Kentaro

Abstract

Brillouin scattering in perfluorinated graded-index polymer optical fibers (PFGI-POFs) is potentially useful in developing high-accuracy distributed temperature sensors with reduced strain sensitivity. In this study, we investigate, both experimentally and theoretically, the influence of the fiber core diameter and length on the Brillouin gain spectra (BGS) in PFGI-POFs. First, we show that smaller core diameter drastically enhances the Stokes power using PFGI-POFs with 62.5-m and 120-m core diameters, and discuss the Brillouin threshold power. Then, we demonstrate that the PFGI-POF length has little influence on the BGS when the length is longer than 50 m. We also predict that, at 1.55-m wavelength, it is difficult to reduce the Brillouin threshold power of PFGI-POFs below that of long silica single-mode fibers even if their core diameter is sufficiently reduced to satisfy the single-mode condition. Finally, making use of the enhanced Stokes signal, we confirm the Brillouin linewidth narrowing effect.

Published
2012
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26. Drastic enhancement of Brillouin Stokes signal using pulsed pump and low-power erbium-doped fiber amplifier

Author

Mizuno, Yosuke and Nakamura, Kentaro

Abstract

Brillouin scattering properties of optical fibers should be precisely investigated in advance for their applications to distributed strain/temperature sensing. Especially when the fibers are short, high-loss, or multi-mode, as in the case of polymer optical fibers, high-power pump is required, but commercially-available high-power lasers or optical amplifiers are expensive. In this paper, we propose a new method to enhance Brillouin scattering signals with a relatively low-cost low-power erbium-doped fiber amplifier by using pulsed pump light. When pulsed pump light with average optical power of 20 mW, duty ratio of 20%, and pulse period of 2 s, was injected into a silica single-mode fiber, the Brillouin signal was enhanced by 25 dB compared to that with continuous-wave pump light having the same average power.

Published
2012
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27. Potential of Brillouin scattering in polymer optical fiber for strain-insensitive high-accuracy temperature sensing

Author

Mizuno, Yosuke and Nakamura, Kentaro

Abstract

We investigated the dependences of Brillouin frequency shift (BFS) on strain and temperature in a perfluorinated gradedindex polymer optical fiber (PFGI-POF) at 1.55-m wavelength. They showed negative dependences with coefficients of -121.8 MHz/% and -4.09 MHz/K, respectively, which are -0.2 and -3.5 times as large as those in silica fibers. These unique BFS dependences indicate that the Brillouin scattering in PFGI-POFs has a big potential for strain-insensitive high-accuracy temperature sensing.

Published
2011
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