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Temperature sensing by mode–mode interference in birefringent optical fibers

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Abstract

Fiber-optic sensors are described that utilize the mode–mode interference of the two orthogonal linear polarizations of the HE11 mode in strongly birefringent single-mode fibers. The sensitivities of various versions of these one-fiber interferometers are calculated. When fibers with high internal stress are used, the temperature sensitivity is reduced by only a factor of 50 compared with that of two-fiber interferometers while the pressure sensitivity is reduced by 7.3 × 103. Thus the cross sensitivity is reduced by a factor of 150.

© 1981 Optical Society of America

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