Abstract

A four-element hydrophone array system using a fiber Bragg grating laser system is described. The demodulation technique for the array combines a 3×3 coupler-based interferometer and three wavelength division multiplexers (WDMs). It is believed to be a new passive approach to use a WDM and a unique arithmetic method. The operational frequency limit depends only on the frequency of its electronic portion. The designed system has achieved a minimum of 7.2×107pm/Hz detectable wavelength perturbation for frequencies that are greater than 200  Hz.

© 2007 Optical Society of America

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