RARE-EARTH DOPED CORE MULTI-CLAD FIBER, FIBER AMPLIFIER, AND FIBER LASER

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A rare-earth doped core multi-clad fiber includes a core that includes a rare-earth element and a plurality of cladding layers that surround the core. An outermost cladding of the plurality of cladding layers is made of a polymer cladding, the plurality of cladding layers have a polygonal inner cladding, and a shape of a boundary between a second cladding from the outside and the outermost cladding does not have two-fold rotational symmetry. As a result, it is possible to provide a rare-earth doped core multi-clad fiber for an optical amplifier and a fiber laser that has low skew and is inexpensive.