VIBRATION-INDUCED NOISE IN A FIBER LEAD OF AN OPTICAL CURRENT MEASUREMENT SYSTEM

A comparative experimental study on the effect of the vibration of an optical fiber lead in an optical current measurement system has been m ade with the use of a polarimeter. The experimental results obtained h ave shown that both the depolarization effect and the decoherence effe ct of a multimode fiber can be used to suppress the vibration-induced noise in a fiber lead in such an optical current measurement system. W ith the use of a low-coherence source and a long multimode fiber of 22 00 m, an improvement of more than 40 dB of the output signal-to-noise ratio has been demonstrated. (C) 1996 American Institute of Physics.