Y
Yoshinori Yamamoto
Researcher at Sumitomo Electric Industries
Publications - 101
Citations - 1125
Yoshinori Yamamoto is an academic researcher from Sumitomo Electric Industries. The author has contributed to research in topics: Optical fiber & Graded-index fiber. The author has an hindex of 21, co-authored 101 publications receiving 1033 citations.
Papers
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Journal ArticleDOI
The First 0.14-dB/km Loss Optical Fiber and its Impact on Submarine Transmission
Yoshiaki Tamura,Hirotaka Sakuma,Keisei Morita,Masato Suzuki,Yoshinori Yamamoto,Kensaku Shimada,Yuya Honma,Kazuyuki Sohma,Takashi Fujii,Takemi Hasegawa +9 more
Abstract: We achieved the lowest-ever transmission losses of 0.1419 dB/km at 1560 nm wavelength and 0.1424 dB/km at 1550 nm in a Ge-free silica-core optical fiber. It was an improvement by 4 mdB/km from the previous record realized in 2015. The Ge-free silica core included fluorine co-doping, which helps to reduce disorder in the microscopic glass network structure that causes Rayleigh scattering loss without a significant increase in waveguide imperfection loss. A two-layered polymer coating with an inner layer having lower elastic modulus than before also contributed to the ultralow loss without influence of microbending loss increase even with an enlarged effective area of 147 μm2. The present fiber with ultralow loss and a large effective area benefits an ultralong haul optical transmission system including transoceanic submarine cable systems. We estimate system performance based on the fiber figure of merit theory that the present fiber enables a 0.10 bit/s/Hz increase in spectral efficiency or 7% reduction in the number of repeaters, compared to the previous record-loss fiber.
Patent
Optical fiber module
TL;DR: In this article, an optical module is connected to external optical equipment with low loss, and excess length portion of a pigtail fiber does not cause an obstruction; the optical fiber module includes a functional optical fiber, a receptacle configured and arranged to accommodate the functional optic fiber, and a pig tail fiber that is attached to the functional optical fibre, and disposed so as to be extendable or retractable from the receptacle.
Journal ArticleDOI
GN-Model Validation Over Seven Fiber Types in Uncompensated PM-16QAM Nyquist-WDM Links
Antonino Nespola,Stefano Straullu,Andrea Carena,Gabriella Bosco,Roberto Cigliutti,Vittorio Curri,Pierluigi Poggiolini,Masaaki Hirano,Yoshinori Yamamoto,Takashi Sasaki,Johan Bauwelinck,Koen Verheyen,Fabrizio Forghieri +12 more
TL;DR: In this article, a set of transmission experiments over seven different uncompensated fiber links carrying a 22-channel Nyquist-WDM signal comb based on polarization-multiplexed 16-quadrature amplitude modulation at RS=15.625 GBd(RB=125 Gb/s).
Proceedings ArticleDOI
Lowest-ever 0.1419-dB/km loss optical fiber
Yoshiaki Tamura,Hirotaka Sakuma,Keisei Morita,Masato Suzuki,Yoshinori Yamamoto,Kensaku Shimada,Yuya Honma,Kazuyuki Sohma,Takashi Fujii,Takemi Hasegawa +9 more
TL;DR: Lowest-ever 0.1419-dB/km loss at 1560-nm wavelength was realized in a silica-core fiber with 1290-°C low fictive temperature, 147-μm2 large effective area and low microbending loss due to soft primary coating.
Proceedings ArticleDOI
Record low loss, record high FOM optical fiber with manufacturable process
Masaaki Hirano,T. Haruna,Y. Tamura,T. Kawano,S. Ohnuki,Yoshinori Yamamoto,Y. Koyano,Takashi Sasaki +7 more
TL;DR: Record-low loss of 0.149dB/km at 1550nm is realized by pure-silica-core fiber having optimally enlarged Aeff, which indicates record-high figure-of-merit for digital coherent system.