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SYSTEM FOR SUPPRESSION OF RELATIVE INTENSITY NOISE IN A FIBER OPTIC GYROSCOPE
SYSTEM FOR SUPPRESSION OF RELATIVE INTENSITY NOISE IN A FIBER OPTIC GYROSCOPE
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机译:光纤陀螺仪中相对强度噪声抑制系统
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摘要
A system is disclosed which suppresses relative intensity noise in a fiber optic gyroscope. A high-speed intensity modulator is placed in the gyroscope light path between the fiber light source and a tap coupler which provides a sample of the modulated signal for use in a feedback loop. A photodetector receives the sampled signal and provides current-to-voltage conversion of the signal. A high-bandwidth voltage amplifier then adjusts the gain and phase of the converted signal and drives the intensity modulator in such a manner as to stabilize the control loop and provide suppression of relative intensity noise. The present system modulates the intensity of the light at a frequency which is sufficiently high to allow suppression of high frequency components of the relative intensity noise.
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