POLARIZATION MAINTAINING FIBER, SYSTEM AND FIBER LASER

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PROBLEM TO BE SOLVED : To provide : a fiber minimized in an amount of polarization mode coupling and polarization mode dispersion and increased in a polarization maintaining function; a polarization maintaining fiber in which pump light is guided inside an inner cladding while a large outside cladding ensures a reduction of mode-coupling inside a fiber core; a system; and a fiber laser. SOLUTION : A polarization maintaining fiber includes : a multi-mode fiber core doped with a rare-earth doping material; a first cladding surrounding the multi-mode fiber core; and a stress producing region provided in the first cladding and producing birefringence which allows single-mode light to transmit through the multi-mode fiber core without causing waveform distortions in a range of a specified fiber length, in the multi-mode fiber core. COPYRIGHT : (C)2013, JPO&INPIT