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Proceedings Paper

Laser-driven fiber optic gyroscope with reduced noise
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Paper Abstract

We demonstrate experimentally that a fiber optic gyroscope (FOG) using an air-core fiber coil can be operated with a laser and still exhibit a fairly low phase noise. This noise is measured to be 1000 μrad/√Hz with a single-frequency laser, and 150 μrad/√Hz when the frequency is swept. When the fiber is replaced with SMF-28 fiber, these figures drop to 100 and 14 μrad/√Hz, respectively. This last value is 35 times lower than the previous record. Comparison to a new model shows that this noise is limited by coherent backscattering, and that the backscattering coefficient inferred for the air-core fiber is ~11 times higher than for the SMF-28 fiber. By reducing the air-core fiber loss from its current high value (24 dB/km) to its theoretical limit (~0.15 dB/km), we predict that this laser-driven air-core FOG will have a noise of only ~0.3 μrad/√Hz, and thus outperform commercial FOGs in terms of not only noise, but also improved thermal and mean-wavelength stability.

Paper Details

Date Published: 16 May 2008
PDF: 4 pages
Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 70044Y (16 May 2008); doi: 10.1117/12.786167
Show Author Affiliations
Vinayak Dangui, Stanford Univ. (United States)
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

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