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 170dB re:pm/μPa over a bandwidth between 100Hz and 500Hz. A sensitivity reduction exceeding 35dB is observed at 2500Hz. The tested static pressure sensitivity of the hydrophone is 226dB. 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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