Fiber optic rotation sensor utilizing high birefringence fiber

Details Fiber optic rotation sensor utilizing high birefringence fiber Fiber optic rotation sensor utilizing high birefringence fiber

G - Physics

01

C

73/53, 340/136.1

G01C 19/64 (2006.01)

Patent

CA 1227660

FIBER OPTIC ROTATION SENSOR UTILIZING HIGH BIREFRINGENCE FIBER Abstract A fiber optic rotation sensor comprises a fiber optic interferometer loop formed from a highly birefringent optical fiber, and a short coherence length source for introducing light into the interferometer loop to provide a pair of waves which counter-propogate therethrough. A detector is included to detect the phase difference between the waves after they have traversed the loop to provide an indication of the loop rotation rate, in accordance with the Sagnac effect. Phase errors are reduced by selecting the coherence length of the source and the birefringence of the fiber, so that the loop is comprised of plural fiber coherence lengths. The term "fiber coherence length" should be distinguished from source coherence length. Fiber coherence length is the length of fiber required for the optical path length difference between the two polarization modes of a single mode fiber to equal one coherence length of the light source.

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