Abstract: A method which is theoretically and experimentally proved to have the ability of eliminating the micro-interference to the leading optical fiber in a bulk glass current sensor is presented here. The method is based on the fact that the polarization coupling is more sensitive to the environment than the intensity coupling is in an optical fiber. All of the two orthogonally polarized beams of the leading fiber are used in this method to improve the stability of the input light intensity. !3
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