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Proceedings Paper

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

Paper Details

Date Published: 14 February 2002
PDF: 10 pages
Proc. SPIE 4578, Fiber Optic Sensor Technology and Applications 2001, (14 February 2002); doi: 10.1117/12.456109
Show Author Affiliations
Gordon S. Kino, Stanford Univ. (United States)
Benjamin J. Vakoc, Novera Optics (United States)
Michel J. F. Digonnet, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 4578:
Fiber Optic Sensor Technology and Applications 2001
Michael A. Marcus; Brian Culshaw, Editor(s)

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