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For practical applications, a noise floor of an interferometric fiber-optic hydrophone system mainly originates from optical phase noise, electronic noise and demodulation algorithm noise. To assess an influence of each noise on the noise floor of the system and explain their interrelation among them, the paper demonstrates theoretically a demodulation scheme for PGC-ATAN (PGC-Arctangent) in detail,...
To meet the sensibility and frequency band need of an fiber-optic Hydrophone system, phase demodulation approaches are proposed to research, which are a PGC-DCM (phase generated carrier-Differentiate Cross Multiply), a PGC-Arctangent, a Heterodyne-DCM and a Heterodyne-Arctangent. The paper demonstrates Heterodyne and PGC schemes in detail, and compares their properties. By Matlab numerical modeling...
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