Polarization-based folded Sagnac fiber optic sensor array for acoustic waves

Gordon S. Kino; Benjamin J. Vakoc; Michel J. F. Digonnet

doi:10.1117/12.456109

14 February 2002 Polarization-based folded Sagnac fiber optic sensor array for acoustic waves

Gordon S. Kino, Benjamin J. Vakoc, Michel J. F. Digonnet

Proceedings Volume 4578, Fiber Optic Sensor Technology and Applications 2001; (2002) https://doi.org/10.1117/12.456109
Event: Environmental and Industrial Sensing, 2001, Boston, MA, United States

Abstract

The basic Sagnac acoustic sensor array consists of a set of fiber hydrophones placed asymmetrically in a long Sagnac loop. It uses time division multiplexing (TDM) to address individual sensors. A new Sagnac-based array is described that uses a folded loop to reduce acoustic pick-up along the loop. This configuration also enables the use of polarization biasing to provide every sensor in the array with a stable phase bias of arbitrary value (including +/- (pi) /2, for maximum sensitivity), thus eliminating signal fading. A further benefit is the use of balanced detection to eliminate the excess noise from the broadband Er-doped fiber source. These improvements are demonstrated experimentally, as well as a minimum detectable signal close to the shot-noise limit (~0.06 (mu) rad/(root)Hz).

Citation Download Citation

Gordon S. Kino, Benjamin J. Vakoc, and Michel J. F. Digonnet "Polarization-based folded Sagnac fiber optic sensor array for acoustic waves", Proc. SPIE 4578, Fiber Optic Sensor Technology and Applications 2001, (14 February 2002); https://doi.org/10.1117/12.456109

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