Laser-driven fiber optic gyroscope with reduced noise

Vinayak Dangui; Michel J. F. Digonnet; Gordon S. Kino

doi:10.1117/12.786167

16 May 2008 Laser-driven fiber optic gyroscope with reduced noise

Vinayak Dangui, Michel J. F. Digonnet, Gordon S. Kino

Proceedings Volume 7004, 19th International Conference on Optical Fibre Sensors; 70044Y (2008) https://doi.org/10.1117/12.786167
Event: 19th International Conference on Optical Fibre Sensors, 2008, Perth, WA, Australia

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.

Citation Download Citation

Vinayak Dangui, Michel J. F. Digonnet, and Gordon S. Kino "Laser-driven fiber optic gyroscope with reduced noise", Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 70044Y (16 May 2008); https://doi.org/10.1117/12.786167

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