Abstract
The passive Resonator Fiber Optic Gyroscope (RFOG) measures the angular velocity by tracking the resonances of two counter propagating probing beams shifted by the Sagnac effect. A light phase modulation is necessary to implement such a tracking, for instance by creating a frequency error signal to lock the frequency of a laser on one of the cavity resonance. It might be accompanied by a Residual Amplitude Modulation (RAM) at the modulation frequency, which constitutes an important limitation to the precision and stability of a resonance frequency measurement. To control the RAM, the classical method was popularized by Wong and Hall in 1985: a dedicated photodetector monitors the intensity of the light before entering in the cavity. The limit of this technique appears when using a phase modulator with an imperfect polarizer at its output following by an optical setup exhibiting polarization dependent losses (PDL). To overcome this problem, we propose a new method based on using a single photodetector generating two errors signals to counteract simultaneously on the laser frequency and the RAM. We demonstrate the effectiveness of our method in the case of fibered systems presenting PDL following a phase modulator without any output polarizer.
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