Optical fiber for optical amplifier

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An optical fiber for an optical amplifier, which contains dysprosium ion (Dy) with an improved light amplification efficiency at the 1.31 mu m band. The optical fiber includes a germanium-gallium-sulfide (Ge-Ga-S) glass, an alkali metal halide, and Dy as a rare earth element. In the optical fiber, the interaction of electrons of Dy and phonons in the glass lattice can be minimized, so that the multiphonon relaxation of Dy from F11/2 and H9/2 to H11/2 is slowed down, and thus the fluorescence lifetime at 1.31 mu m is elongated, further improving the fluorescence efficiency of the optical fiber.