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Proceedings Paper

Near shot-noise limited performance of an open loop laser-driven interferometric fiber optic gyroscope
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Paper Abstract

We report for the first time experimental evidence of near shot-noise limited performance for an open loop interferometric fiber optic gyroscope interrogated with a narrowband laser instead of a broadband source. Using a highly coherent laser source (▵f = 2.2 kHz), the measured gyroscope noise is 350 nrad/Hz for an average returning power of 20 μW, while the measured noise for the same gyro operated with a broadband source (▵λ ≈ 30 nm) was 850 nrad/√Hz. This measured noise is only ~2 dB above the calculated shot noise for this power. This result was made possible by using a very narrow linewidth, which greatly reduces the laser phase noise and thus the phase-noise-mitigated coherent backscattering. This excellent noise performance has applications for future fiber gyroscope technologies as well as other sensors utilizing a Sagnac interferometer. The bias drift of the laser-driven gyroscope was higher than anticipated but could be reduced to roughly Earth-rate using a frequency sweeping technique. In addition to improved sensitivity, the benefits of using a laser include much higher scale factor stability, lower power consumption, and lower component cost.

Paper Details

Date Published: 19 May 2011
PDF: 4 pages
Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 7753A3 (19 May 2011); doi: 10.1117/12.899550
Show Author Affiliations
Seth W. Lloyd, Edward L. Ginzton Lab., Stanford Univ. (United States)
Michel J. F. Digonnet, Edward L. Ginzton Lab., Stanford Univ. (United States)
Shanhui Fan, Edward L. Ginzton Lab., Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 7753:
21st International Conference on Optical Fiber Sensors
Jacques Albert; Wojtek J. Bock, Editor(s)

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