CROSSTALK ANALYSIS AND SYSTEM-DESIGN OF TIME-DIVISION MULTIPLEXING OFPOLARIZATION-INSENSITIVE FIBER OPTIC MICHELSON INTERFEROMETRIC SENSORS

The time-division multiplexing of polarization-insensitive fiber optic Michelson interferometric sensors (TDM-PIFOMI) with compensating inte rferometer is presented. The lead crosstalk in a general time-division multiplexing of the fiber optic interferometric sensors is described and demonstrated. The sensor crosstalk of TDM-PIFOMI for optical gate with finite extinction ratio is analyzed and using a laser source with adequate coherence length to reduce sensor crosstalk is suggested. Th e delay fiber crosstalk and noise of TDM-PIFOMI by Rayleigh backscatte ring is analyzed and demonstrated. We also suggest some methods that c ould possibly reduce the effect of the Rayleigh backscattered light, F inally, the advanced system design of TDM-PIFOMI is described.