Rare earth doped コアマルチクラッドファイバ , fiber amplifier and fiber laser

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A rare-earth doped core multi-clad fiber that includes : a core that includes a rare-earth element; and a plurality of cladding layers that surround the core, in which : an outermost cladding of the plurality of cladding layers is made of 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 fiber laser that has low skew and is inexpensive.