Aiming at the visibility of interferential stripe output of interferometer is affected by the polarization state’s transformation of input light and double refraction of single mode fiber with two arms during the course of signal demodulation of fiber laser sensor

a polarization-induced fading elimination method of fiber interferometer is introduced.Two Faraday rotator mirrors are added into Michelson fiber interferometer to improve visibility of stripe output.The Jones matrix is used to do theoretic calculation of the fiber interferometer system

which proves the polarization-induced fading can be eliminated when the rotator degrees of Faraday rotator mirrors are around 45°

and it is demonstrated effectively thragh experiments.