Research on quadrature crosstalk in the time-division-multiplexing optical fiber vector sensor array based on PGC technology

摘要

We investigate the quadrature crosstalk characteristics of three-dimensional optical fiber vector sensor in a time-division-multiplexing (TDM) array based on phase generated carrier (PGC) technology in theory and experiment. A theoretical model based on PGC demodulation technology is established. The numerical simulation based on the theoretical model is carried on and indicates that the quadrature crosstalk of the optical fiber vector sensor is governed by the path difference of the interferometer, the length of the delay fiber, the number of array channels and the extinction ratio of the acousto-optic modulator (AOM). A four channels TDM array based on four cascaded interferometers was set up to verify the theoretical analysis. The experimental results agree well with the theoretical analysis. This research provides insight into the quadrature crosstalk in a TDM optical fiber vector sensor array, and can be used to optimize the array design in specific applications.