Simulation and testing of a noise-limited demodulation system for a fiber-optic hydrophone system based on a Michelson interferometer

In order to demodulate an underwater acoustic signal detected by a fiber-optic hydrophone system, some different demodulation principles are proposed for study. Of all the principles, PGC (phase generated carrier) technology is more and more commonly used in a fiber-optic Michelson hydrophone system at present. In this paper, through SIMULINK and LABVIEW simulation, a mono-frequency signal, a double-frequency signal and a nine-frequency signal are all successfully demodulated with no distortion by using the PGC principle. Meanwhile, PGC demodulation technology can effectively suppress system noise and environment noise. Finally, in the fiber-optic Michelson hydrophone system experiment, acoustic signals can successfully be detected and demodulated. It is of important significance for the study and application of a fiber-optic hydrophone system based on a Michelson interferometer.