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Proceedings Paper

Sensitivity limits of a Sagnac interferometer due to fundamental thermal-induced phase fluctuations in the fiber coil
Author(s): Sverre Knudsen; Alan B. Tveten; Anthony D. Dandridge
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Paper 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.

Paper Details

Date Published: 1 November 1994
PDF: 7 pages
Proc. SPIE 2292, Fiber Optic and Laser Sensors XII, (1 November 1994); doi: 10.1117/12.191843
Show Author Affiliations
Sverre Knudsen, Naval Research Lab. (United States)
Alan B. Tveten, Naval Research Lab. (United States)
Anthony D. Dandridge, Naval Research Lab. (United States)

Published in SPIE Proceedings Vol. 2292:
Fiber Optic and Laser Sensors XII
Ramon P. DePaula, Editor(s)

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