Sumitomo Electric Industries, Limited

Toshimi Suzuki

Shinji Ishikawa

Motoki Kakui

Shinji Endo

Tomonori Kashiwada

Yasuhiko Shishido

Souichi Endo

An optical fiber bundle includes a plurality of optical fibers bundled on an input terminal side and on an output terminal side. The optical fiber bundle receives light from the input terminal side, and outputs the light to the output terminal side. The optical fiber bundle has a feature in that the optical fiber are divided, on the input terminal side, individually or into a plurality of groups in accordance with output terminal side positions of the optical fiber. The optical fiber bundle is arranged to adjust input light for each of the optical fibers or for each of the groups.

Optical fiber bundle, light source device using the optical fiber bundle, and method for manufacturing the light source device

This invention relates to an optical fiber for amplification suitable for amplifying signals in the L-band, an optical fiber amplifier including the optical fiber, and an optical transmission system. The optical fiber amplifier according to the invention includes a silica-based optical fiber as an optical fiber for amplification, which has a core region doped with Er and Al. The optical fiber for amplification has an Er concentration of 1,500 wt.ppm or less, and has the characteristics at a wavelength of 1.53 &#x3bc;m of: an absorption loss of 10 dB/m or more but 25 dB/m or less; and an unsaturated absorption of 900 dB or less.

Amplifying optical fiber, optical fiber amplifier and optical transmission system

Light-amplifying optical fiber and method of making the same

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Yokohama, Japan

Toshimi Suzuki