Abstract
Heterodyne fiber-optic hydrophone systems of the single fiber type and the Mach-Zehnder type using a transverse Zeeman laser were studied. The carrier frequency obtained from the optical beat of two orthogonally polarized laser lights of different frequencies was 488 kHz and a S/N ratio of 60 dB was obtained. The frequency shift caused by underwater sound was evaluated by the spectrum analysis of the frequency modulated output signal. The ratio of the optical frequency shift per meter of the fiber to the sound pressure of 6 kHz was 9.95×10-6 Hz/µPa·m for the single fiber scheme and 1.46×10-3 Hz/µPa·m for the Mach-Zehnder scheme.
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