The Furukawa Electric Co., Ltd.

Yoko Moriai

Keiichi Aiso

Takeshi Yagi

Toshihiro Nakamura

Hisashi Koaizawa

An optical amplification fiber for an optical fiber amplifier that amplifies a signal light using a pumping light has an absorption coefficient that satisfies conditional relations &#x3b1;s&#x2267;2.0 dB/m and &#x3b1;p/&#x3b1;s&#x2267;&#x2212;0.0697&#xd7;&#x3b1;s+1.30, where &#x3b1;p is the absorption coefficient in a pumping light wavelength band, and &#x3b1;s is the absorption coefficient in a signal light wavelength band.

Optical amplification fiber, optical fiber amplifier, and optical communication system

An optical fiber for optical amplification, characterized in that a full width at half maximum of gain spectrum is 45 nm or more; and a maximum value of power conversion efficiency is 80% or more. A method for producing a rare earth element-doped glass for use in manufacturing the optical fiber, which comprises a deposition step of depositing fine silica glass particles and a co-dopant (a) to prepare an aggregate of fine silica glass particles doped with the co-dopant (a); and a immersion step of immersing the aggregate of fine silica glass particles prepared in the deposition step in a solution containing the rare earth element and the co-dopant (b) to thereby dope the aggregate of fine silica glass particles with the rare earth element component and the co-dopant (b).

Growing community of inventors

Tokyo, Japan

Yoko Moriai