Abstract. The influence of elastic strain on variation of light wave phase in a fiber-optic gyroscope is studied both numerically and experimentally. Solution to the stationary thermos-elasticity problem for a structurally inhomogeneous fiber circuit is derived to determine local elastic strains in the fiber. The temperature effect on the object under investigation is taken as a load. The numerical solution to the problem is found out by the finite element method in the ANSYS software. Calculated distributions of elastic strain along the fiber are presented. The frequencies of stimulated Brillouin scattering at two temperatures are determined experimentally using an optical time domain analyzer. The influence of temperature variations and elastic strain on the Brillouin frequency shift is established. The calculated strain values are shown to be in accordance with the experimental data.

Keywords: fiber-optic gyro, fiber circuit, refractive index, elastic strain, finite element method

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