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515 results on '"Nakajima, Kazuhide"'

4. Japanese National Projects on SDM Technologies

Author

Awaji, Yoshinari, Miyamoto, Yutaka, Miyazaki, Tetsuya, Morioka, Toshio, Morita, Itsuro, Nakajima, Kazuhide, Takara, Hidehiko, Tsuritani, Takehiro, Lotsch, H.K.V., Founding Editor, Rhodes, William T., Editor-in-Chief, Adibi, Ali, Series Editor, Asakura, Toshimitsu, Series Editor, Hänsch, Theodor W., Series Editor, Krausz, Ferenc, Series Editor, Masters, Barry R., Series Editor, Midorikawa, Katsumi, Series Editor, Venghaus, Herbert, Series Editor, Weber, Horst, Series Editor, Weinfurter, Harald, Series Editor, Kobayashi, Kazuya, Series Editor, Markel, Vadim, Series Editor, Nakazawa, Masataka, editor, Suzuki, Masatoshi, editor, Awaji, Yoshinari, editor, and Morioka, Toshio, editor

Published
2022
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5. Optical Fibers for Space-Division Multiplexing

Author

Ohashi, Masaharu, Matsuo, Shoichiro, Hayashi, Tetsuya, Imamura, Katsunori, Kokubun, Yasuo, Koshiba, Masanori, Mori, Takayoshi, Nakajima, Kazuhide, Nakazawa, Masataka, Saitoh, Kunimasa, Sakamoto, Taiji, Sasaki, Takashi, Lotsch, H.K.V., Founding Editor, Rhodes, William T., Editor-in-Chief, Adibi, Ali, Series Editor, Asakura, Toshimitsu, Series Editor, Hänsch, Theodor W., Series Editor, Krausz, Ferenc, Series Editor, Masters, Barry R., Series Editor, Midorikawa, Katsumi, Series Editor, Venghaus, Herbert, Series Editor, Weber, Horst, Series Editor, Weinfurter, Harald, Series Editor, Kobayashi, Kazuya, Series Editor, Markel, Vadim, Series Editor, Nakazawa, Masataka, editor, Suzuki, Masatoshi, editor, Awaji, Yoshinari, editor, and Morioka, Toshio, editor

Published
2022
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18. Single-Mode-Fiber Design for Low Latency and Low Loss

Author

Sagae, Yuto, Matsui, Takashi, Mori, Takayoshi, and Nakajima, Kazuhide

Abstract

Low-latency transmission is necessary for optical transmission systems, and a reduction in propagation delay of 1 μs in an optical fiber is effective. We investigated the tradeoff between latency and loss among silica-glass solid-core optical fibers. The decreases in the core radius and core refractive index are known to reduce group delay of pure silica core fibers. We experimentally evaluated the Rayleigh-scattering-loss and imperfection-loss characteristics of pure silica core fibers with smaller radius and fluorine (F)-doped core fibers. A decrease in the pure-silica-core radius has a non-negligible impact on imperfection-loss increase compared with on Rayleigh-scattering-loss increase induced by F-doped core and clad. We show the potential of F-doped core designs for reducing propagation delay of 1 μs after an over 500-km long transmission while suppressing the impact on loss increase.

Published
2024
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50. Applicability of Standard Cladding Diameter Multi-Core Fiber Cables for Terrestrial Field

Author

Mori, Takayoshi, Yamada, Yusuke, Shibahara, Kohki, Matsui, Takashi, Kikuchi, Masashi, Sagae, Yuto, Soma, Daiki, Beppu, Shohei, Nagashima, Takuji, Morishima, Tetsu, Hayashi, Tetsuya, Ohzeki, Masaki, Takenaga, Katsuhiro, Takahashi, Masanori, Sasaki, Tsubasa, Sugizaki, Ryuichi, Miyamoto, Yutaka, and Nakajima, Kazuhide

Abstract

In this paper, we investigate the deployment properties of step-index multi-core fibers (SI-MCFs) and trench-assisted multi-core fibers (TA-MCFs) in terrestrial high-density cables and links. We reveal that SI-MCFs and TA-MCFs can be designed with the same core pitch while maintaining their compatibility with conventional single-mode fiber (SMF) compliant with ITU-T Recommendation G.652. When SI-MCFs and TA-MCFs were implemented in high-density cables, we observed no significant increase in loss during the cabling and installation processes. Furthermore, the crosstalk deviation between processes is consistent with power coupling theory, indicating that effective bending is a key factor in determining the crosstalk under deployed conditions. We also confirm that good fusion splicing for MCF link connection is achievable by ensuring sufficient angular alignment accuracy. Additionally, our field experiments verify that accounting for the randomness of MCFs in the longitudinal direction of the link can reduce the characteristic deviation between MCF cores, leading to improved transmission characteristics.

Published
2024
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