Leakage light processing structure of the optical fiber

PROBLEM TO BE SOLVED: To provide a processing structure for crosstalk light of an optical fiber capable of effectively removing crosstalk light propagated in the optical fiber, and an optical fiber laser. SOLUTION: The processing structure for crosstalk light of the optical fiber is provided with: the optical fiber which has a core part and a clad part formed around an outer periphery of the core part and having a lower refractive index than the core part; and a crosstalk light guide member which has a refractive index equal to or larger than that of the clad part and formed in a cylindrical shape having an internal diameter equal to the external diameter of the clad part and fixed in contact with the outer periphery of the optical fiber inserted into it. COPYRIGHT: (C)2009,JPO&INPIT