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Proceedings Paper

Fiber-optic gyroscope operated with a frequency-modulated laser
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Paper Abstract

We propose using a frequency-modulated laser in a fiber-optic gyroscope (FOG) in a minimum configuration. Compared to the traditional broadband source, a narrow-band laser offers two significant advantages, namely the elimination of excess noise and thus improved sensitivity to rotation, and a more stable mean wavelength, hence a greater scale-factor stability. We show that the strong back-reflection and coherent backscattering noise introduced by the use of a laser is greatly reduced by modulating the laser frequency. In both a conventional FOG and in a FOG using an air-core fiber, we demonstrate experimentally that this technique reduces these two sources of noise by at least a factor of 4 compared to the same gyros operated with an unmodulated laser.

Paper Details

Date Published: 16 May 2008
PDF: 4 pages
Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 70044X (16 May 2008); doi: 10.1117/12.786165
Show Author Affiliations
Stéphane Blin, Ecole Nationale Superieure des Sciences Appliquées et de Technologie (France)
Michel J. F. Digonnet, Stanford Univ. (United States)
Gordon S. Kino, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 7004:
19th International Conference on Optical Fibre Sensors
David Sampson; Stephen Collins; Kyunghwan Oh; Ryozo Yamauchi, Editor(s)

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