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Your search keyword '"Soma, Daiki"' showing total 10 results
Start Over Author "Soma, Daiki" Journal journal of lightwave technology
10 results on '"Soma, Daiki"'

1. 115.2-THz Aggregate Bandwidth O-band Coherent DWDM Transmission Over a High-Density 250-<inline-formula><tex-math notation="LaTeX">$\mu$</tex-math></inline-formula>m Coating Multicore Fibre

Author

Elson, Daniel J., Beppu, Shohei, Inoue, Ayumi, Soma, Daiki, Nagashima, Takuji, Mikhailov, Vitaly, Luo, Jiawei, Takasaka, Shigehiro, Inniss, Daryl, Yoshikane, Noboru, Tsuritani, Takehiro, Hayashi, Tetsuya, and Wakayama, Yuta

Abstract

The rising demand for high transmission bandwidths in optical fibres for short-distance applications can be addressed by increasing the number of cores. Higher core densities in the fibres can be paired with the bandwidth enhancements provided by a bismuth-doped fibre amplifier (BDFA) operating in the O-band due to the lower intercore-crosstalk. In this study, we showcase an ultrawide O-band coherent transmission using a 12-core fibre with a standard 250-$\mu$m coating diameter. By using bidirectional transmission, inter-core crosstalk was effectively reduced to below $-$45 dB across a distance of 31.7 km (including multi-core connectors). The total aggregate bandwidth achieved was 115.2 THz, while retaining the conventional coating diameter, confirming the fibre's suitability for space-constrained environments.

Published
2025
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2. 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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9. 10.16-Peta-bit/s Dense SDM/WDM Transmission over 6-Mode 19-Core Fiber across the C+L Band

Author

Soma, Daiki, primary, Wakayama, Yuta, additional, Beppu, Shohei, additional, Sumita, Seiya, additional, Tsuritani, Takehiro, additional, Hayashi, Tetsuya, additional, Nagashima, Takuji, additional, Suzuki, Masato, additional, Yoshida, Masato, additional, Kasai, Keisuke, additional, Nakazawa, Masataka, additional, Takahashi, Hidenori, additional, Igarashi, Koji, additional, Morita, Itsuro, additional, and Suzuki, Masatoshi, additional

Published
2018
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