Abstract

A fiber optic vector hydrophone is an interesting topic for many applications. Using a fiber Bragg grating (FBG) as a reflection unit, the vector hydrophone combines the advantages of miniaturization, high reliability, and low cost. In this paper, the interferometric vector sensing, multiplexing design, and cross-talk suppression of a fiber optic vector hydrophone based on FBG-based Fabry–Perot interferometry are discussed and validated. The average cross talk of the channels is reduced by 20 dB than that of a high-reflectivity grating by using 1% reflectivity fiber gratings. A three-component homovibrational vector hydrophone with a low-reflection FBG was developed and tested. The working band of the hydrophone is extended to 20 Hz, and the sensitivity of each vector channel is about 132.5dB at 500 Hz and its directivity index is more than 30 dB at 100 Hz.

© 2018 Optical Society of America

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