Sensitivity limits of a Sagnac interferometer due to fundamental thermal-induced phase fluctuations in the fiber coil

Sverre Knudsen; Alan B. Tveten; Anthony D. Dandridge

doi:10.1117/12.191843

1 November 1994 Sensitivity limits of a Sagnac interferometer due to fundamental thermal-induced phase fluctuations in the fiber coil

Sverre Knudsen, Alan B. Tveten, Anthony D. Dandridge

Author Affiliations +

Proceedings Volume 2292, Fiber Optic and Laser Sensors XII; (1994) https://doi.org/10.1117/12.191843
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

We briefly review the theory of fundamental thermal induced phase fluctuations in the fiber- loop of a Sagnac interferometer and compare it to novel experimental data. Loop lengths of 1.1 and 2.2 km are considered, showing phase noise levels between approximately 0.2 - 1.4 (mu) rad rms/(root)Hz in the frequency range 1 - 100 kHz. Excellent agreement between theory and experiment is demonstrated, showing that this noise source can have considerable impact on the threshold detection of a Sagnac interferometer based sensor for both detection of reciprocal and non-reciprocal measurands, using practical system parameters. We discuss the impact of this noise source when the Sagnac interferometer is configured for rotation sensing, and show the dependence of the random walk coefficient when the bias frequency and system parameters are varied.

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Sverre Knudsen, Alan B. Tveten, and Anthony D. Dandridge "Sensitivity limits of a Sagnac interferometer due to fundamental thermal-induced phase fluctuations in the fiber coil", Proc. SPIE 2292, Fiber Optic and Laser Sensors XII, (1 November 1994); https://doi.org/10.1117/12.191843

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