Optical fiber and its manufacturing method

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PROBLEM TO BE SOLVED : To provide an optical fiber whose conversion efficiency is not lowered by a thermal effect (heat dispersion) and a nonlinear effect and which has optimum absorption characteristics and to provide its producing method. SOLUTION : The optical fiber 1 comprises : a core 2 added with a rare earth element which acts as a gain medium; and a clad 3 formed on the outer periphery of the core 2, wherein the fictive temperature of the core 2 is 1, 500°C or lower. COPYRIGHT : (C)2009, JPO&INPIT