Abstract

A distributed-feedback fiber laser hydrophone with band-pass response is presented. The design of the hydrophone aims to equalize static pressure and eliminate signal aliasing of high-frequency acoustic components. Theoretical analysis is presented based on electro-acoustic theory. The experimental results agree well with the theory. The measured underwater responses show that the hydrophone has a pressure sensitivity of $-170\mathrm{dB}$ $\mathrm{re}:\mathrm{pm}/\mathrm{\mu Pa}$ over a bandwidth between $100\mathrm{Hz}$ and $500\mathrm{Hz}$. A sensitivity reduction exceeding $-35\mathrm{dB}$ is observed at $2500\mathrm{Hz}$. The tested static pressure sensitivity of the hydrophone is $-226\mathrm{dB}$. The proposed fiber laser hydrophone of this kind is expected to have important application in deep water fiber-optic sonar systems with anti-aliasing, and the understanding gained through this work can be extended to a guide of hydrophone design for required filtering bandwidth.

© 2011 Optical Society of America

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