The time-division multiplexing of polarization-insensitive fiber optic Michelson interferometric sensors (TDM-PIFOMI) with compensating interferometer is presented. The crosstalk of lead fiber in a general time-division multiplexing of the fiber optic interferometric sensors is described and demonstrated. The experimental results match excellently with theoretical derivation. According to the experimental result and derived theory, only the induced phase signal of the sensitive lead fiber results in lead crosstalk , the sensing fiber of one sensor in the time-division multiplexing should not be placed on the effectively sensitive lead fiber of the other sensor to avoid the sensor crosstalk from lead crosstalk .
An optical fiber PZT cylinder phase modulator is frequently used in an optical fiber interferometric sensor for demodulating sensing signals. In this paper, we combine the piezoelectric equations and the fiber phase shift relations to deliver a thorough description of the phase response of the optical fiber PZT cylinder phase modulator. We also design an experiment to verify our derivation. The result is quite compatible with published data.
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