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Reduction of backscattering error in an optical fiber gyro

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Abstract

Rayleigh backscattering has recently been recognized as an important factor which may limit the sensitivity of optical fiber Sagnac rotation sensors.1 Each primary wave that counterpropagates around the sensing loop excites small scale inhomogeneities in the fiber, which in turn act as induced dipole radiators.2 The fiber captures a portion of the scattered radiation and guides it in the reverse direction. The contributions from each scatterer add vectorially to constitute a total backscattered field in each direction, which has an amplitude and phase that are stable in time if the loop is not perturbed.

© 1981 Optical Society of America

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