Optical rotation-sensing interferometer with (3.times.3)-(2.time

Details Optical rotation-sensing interferometer with (3.times.3)-(2.time Optical rotation-sensing interferometer with (3.times.3)-(2.time

1982-03-09

1984-10-30

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

350 9615, G01C 1964, G02B 514

Patent

active

044797150

ABSTRACT:
A Sagnac rotation-sensing interferometer with a fiber-optic loop for providing a closed optical path in which counter-propagating light beams are phase shifted due to the Sagnac effect and with an otical coupler for splitting an input beam into the counter-propagating light beams in the fiber-optic loop and for providing for interference between the output beams of the fiber-optic loop. The optical coupler includes a (3.times.3) coupler with two first output waveguides symmetrically disposed about an input waveguide for splitting the input beam into equal components and a (2.times.2) coupler with two second output waveguides adjacently disposed for providing interference between the output beams. The second output waveguides of the (2.times.2) coupler couple the first otput waveguides of the (3.times.3) coupler to the end of the fiber-optic loop.

REFERENCES:
patent: 3102953 (1963-09-01), Wallace
patent: 4013365 (1977-03-01), Vali et al.
Bulmer, Sheem, Moller and Burns, "High-Efficiency Flip-Chip Coupling Between Single-Mode Fibers and LiMb0.sub.3 Channel Waveguides" Appl. Phys. Lett., 37, pp. 351-353, 1980.
Rashleigh and Burns, "Dual-Input Fiber-Optic Gyroscope", Optics Letters, vol. 5, No. 11, p. 482, Nov. 1980.
Sang K. Sheem, "Fiber-Optic Gyroscope with (3.times.3) Directional Coupler", Appl. Phys. Lett. 37(10), Nov. 15, 1980.
Sang K. Sheem, "Optical Fiber Interferometers with (3.times.3) Directional Couplers: Analysis", Jr. Appl. Phys. 52(6), Jun. 1981.
Sang K. Sheem, "Optical Fiber Gyroscope with (3.times.3) Directional Coupler, " U.S. Patent Appl. No. 320,999.
W. K. Burns, "Fiber Optic Rotation-Sensing Interferometer with (3.times.2) Coupler", filed Feb. 25, 1982, Navy Case No. 65,127.

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