Abstract
An analysis, based on Jones calculus, is presented of polarization
effects in the merged Sagnac-Michelson interferometric sensor for
distributed disturbance detection. The nature of birefringence biasing in
the Sagnac interferometer is clarified: the cosine-response of the Sagnac
interferometer can be biased to a sine-response by introducing
birefringence with retardation equal to \pi/2 in the Sagnac-loop. In
addition, the input light should be linearly polarized and both the
direction of polarization and the optical axes of the birefringence region
should be oriented at \pi/4 with respect to the plane of the
fiber-loop.
© 1998 IEEE
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