G - Physics – 01 – C
Patent
G - Physics
01
C
26/197, 33/49, 8
G01C 19/64 (2006.01) G01C 19/72 (2006.01) G02B 6/28 (2006.01) G02B 6/34 (2006.01)
Patent
CA 1295828
FIBER OPTIC GYROSCOPE WITH IMPROVED BIAS STABILITY AND REPEATABILITY AND METHOD ABSTRACT OF THE DiSCLOSURE A fiber gyroscope provides improved bias stability and repeatability and has a greatly reduced polarizer extinction ratio requirement compared previous devices. This fabrication technique is compatible with both an all fiber gyroscope configuration and an integrated optics or bulk optics device. The present invention comprises a substrate that is preferably formed of fused silica. A pair of optical fibers, or two lengths of one fiber, are mounted to the substrate, and first planar surfaces are formed in the cladding. Optical couplers, polarizers and other components used in forming the rotation sensor are formed on the planar cladding surfaces of the fibers. Polarizers formed on the fibers have a transmission axis aligned with an axis of birefringence of the fiber to remove undesired linear polarization components from optical signals guided by the fibers while permitting a desired linear polarization component to propagate unattenuated. A sensing coil of optical fiber is arranged to guide light between the first and second optical fibers, the first and second optical fibers and the optical coupler cooperating to introduce counterpropagating light waves in the sensing coil.
576344
Litton Systems Inc.
Macrae & Co.
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