Optically-locked fiber-optic resonant gyro

Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer

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372 6, 372 20, 372 32, 372 94, G01B 902

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053981111

ABSTRACT:
A fiber optic resonance gyroscope which has a laser diode as the coherent light source and employs direct optical feedback to that laser diode from light propagating in one direction around a fiber optic resonance ring operating in the peak resonance mode, to maintain the laser output locked to the resonance frequency of the ring. Light propagated around the fiber optical ring in the opposite direction is phase and frequency modulated before being coupled to the ring and a portion of that light exiting the ring is photodetected, the resultant electrical signal being demodulated and used as an error control signal to maintain the modulation frequency at a specific value related to the resonance frequency of the ring for light transmitted in that direction. This error control signal is taken as the gyroscope output of the system.

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