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Measurements of fundamental thermal induced phase fluctuations inthe fiber of a Sagnac interferometer
Authors:Knudsen   S. Tveten   A.B. Dandridge   A.
Affiliation:Div. of Opt. Sci., Naval Res. Lab., Washington, DC ;
Abstract:
We demonstrate measurements of fundamental thermal induced phase fluctuations in the fiber-loop of a Sagnac interferometer. Loop lengths of 1.1 and 2.2 km are considered, showing phase noise levels between ~0.2-1.4 μrad rms/√(Hz) in the frequency range 1-100 kHz. Good agreement between theory and experiment is demonstrated. We show that the frequency dependent noise floor can have a considerable impact on threshold detection's for a Sagnac based sensor for detection of reciprocal measurands, as well as on the random walk coefficient in fiber optic gyroscopes
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