Fiber optic rotation-sensing gyroscope with (3.times.2) coupler

Details Fiber optic rotation-sensing gyroscope with (3.times.2) coupler Fiber optic rotation-sensing gyroscope with (3.times.2) coupler

1982-03-01

1984-05-01

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

350 9615, G01C 1964, G02B 514

Patent

active

044457804

ABSTRACT:
A Sagnac gyroscope, for measuring rotation rates, having an optical coupler, adapted for fabrication by integrated optical techniques, which is compact and provides for operation of the gyroscope at quadrature for small rotation rates. The optical coupler is a symmetrical, channel waveguide structure comprising a two-mode central waveguide branching into three one-mode input waveguides at one end and into two one-mode output waveguides at the other end. The output waveguides are optically coupled to the ends of a fiber-optic loop which provides a closed optical path in which the Sagnac phase shift is produced. The middle input waveguide is adapted to transmit an incident beam into the optical coupler while the outer input waveguides are adapted to transmit the output beams of the Sagnac gyroscope to a circuit for measuring and comparing the intensities of the beams in the outer waveguides so that the rotation rate may be determined.

REFERENCES:
patent: 3102953 (1963-09-01), Wallace
patent: 4013365 (1977-03-01), Vali et al.
Rashleigh and Burns, Dual-Input Fiber-Optic Gyroscope, Optics Ltrs., vol. No. 11, p. 482, Nov. 1980.
Patent Application No. 320,999.
"Dielectric Rectangular Waveguides and Directional Couplers for Integrated Optics" Bell Syst. Tech. J., vol. 48, pp. 2071-2102, Sep. 1967.

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