Dual Input Gyroscope.
DEPARTMENT OF THE NAVY WASHINGTON DC
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This invention relates to a fiber-optic gyroscope designed to operate at maximum sensitivity by supplying two equal-intensity input beams with a specific phase difference to the gyroscope optical coupler. When the coupler outputs into the gyroscope optical fiber coil are of equal intensity, reciprocity requires the gyroscope to operate at quadrature. This device is realized by splitting a laser beam into two paths with a phase shifter in one of the paths to control the phase shift and thereby the intensity of the beams, and coupling the light from these paths into a fiber optic coil via a four-port 3dB coupler.
- Fiber Optics and Integrated Optics