Optical gyroscope with large propagation constant difference

Details Optical gyroscope with large propagation constant difference Optical gyroscope with large propagation constant difference

1982-03-03

1984-11-20

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

350 9630, 356351, G01B 902, G01C 1964

Patent

active

044836171

ABSTRACT:
In an optical gyroscope comprising a coil of an optical fiber having opposite ends on which linearly polarized input light beams are incident and from which output light beams are derived which create an interference pattern to be detected, the optical fiber has orthogonal principal axes along which the light beams propagate at a large propagation constant difference. The application of the linearly polarized input light beams to the opposite ends of the optical fiber coil is such that the polarization plane of the linearly polarized light beam coincides with the same principal axis on the opposite ends. Thus, polarization characteristics of the output light beam from the optical fiber coil becomes time invariant and the light paths for the two light beams coincide with each other. In particular, in order to minimize the influence of external disturbances, the optical fiber has a structure defined by

REFERENCES:
patent: 4179189 (1979-12-01), Kaminow et al.
patent: 4274854 (1981-06-01), Pleibel et al.
Schiffner et al., "Reciprocity of Birefringent Single--Mode Fibers for Optical Gyros", Applied Optics, vol. 18, #13, Jul. 1, 1979, pp. 2096-2097.
Ramaswamy et al., "Single Polarization Optical Fibers", Exposed Cladding Technique", Appl. Phys. Lett. 33 (9), Nov. 1, 1978, pp. 814-816.
"Birefringence in Elliptically Clad Borosilicate Single--Mode Fibers" Ramaswamy et al., Applied Optics, vol. 18 #24, Dec. 15, 1979, pp. 4080-4084.
"Linear Polarization in Birefringent Single--Mode Fibers", Stolen et al., Appl. Phys. Lett. 33 (8), Oct. 15, 1978, pp. 699-701.
"Fiber--Ring Interferometer: Polarization Analysis", Ulrich et al., Optics Letters, vol. 4, No. 5, May 1979, pp. 152-154.

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