Crosstalk analysis and system design of time-division multiplexing of polarization-insensitive fiber optic Michelson interferometric sensors

The time-division multiplexing of polarization-insensitive fiber optic Michelson interferometric sensors (TDM-PIFOMI) with compensating interferometer 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. The delay fiber crosstalk and noise of TDM-PIFOMI by Rayleigh backscattering is analyzed and demonstrated. We also suggest some methods that could possibly reduce the effect of the Rayleigh backscattered light. Finally, the advanced system design of TDM-PIFOMI is described.