Light amplification optical fiber and light amplifier using the same
AssigneeFurukawa Electric Co., Ltd.
InventorsKeiichi Aiso, Yoshio Tashiro, Takeshi Yagi
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Abstract
A light amplification optical fiber capable of suppressing a decrease in an amplification efficiency thereof ascribed to the concentration quenching of erbium ions, and the nonlinearity thereof is provided. At least one rare earth element, for example, Yb, which is other than the erbium ions, and which has an ion radius not smaller than 70% and not larger than 130% of that of erbium ions is doped to a core portion of an erbium ion-doped light amplification optical fiber.
Claims15
A light amplification optical fiber having a core portion, and not less than one layer of clad portion surrounding an outer circumference of the core portion, erbium ions being doped to the core portion, comprising at least:
- one kind of rare earth element ions further doped to the core portion which are other than the erbium ions, and which have ion radius of not lower than 70% and not higher than 130% of that of the erbium ions.
Dependencies are inferred from the claim text.