RARE EARTH ELEMENT DOPED OPTICAL FIBER, AND METHOD FOR IMPROVING RADIATION RESISTANCE OF RARE EARTH

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PROBLEM TO BE SOLVED : To provide a novel rare earth element doped optical fiber which includes a rare earth element and phosphorous in a core part, nonetheless has high radiation resistance and is hard to be reduced in gain even when used in an environment where radiation is present. SOLUTION : The rare earth element doped optical fiber includes : a core portion; and a clad portion covering the periphery of the core portion. The core portion includes erbium, ytterbium, phosphorus, and germanium. SELECTED DRAWING : Figure 1 COPYRIGHT : (C)2019, JPO&INPIT