Journal
OPTICAL AND QUANTUM SENSING AND PRECISION METROLOGY II
Volume 12016, Issue -, Pages -Publisher
SPIE-INT SOC OPTICAL ENGINEERING
DOI: 10.1117/12.2608101
Keywords
Residual Amplitude Modulation; Cavity; Resonant Fiber Optic Gyroscope; Frequency locking
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In a resonator fiber optic gyroscope (RFOG), residual amplitude modulation (RAM) affects the stability of resonance frequency measurement and limits the performance of the gyroscope. The traditional RAM suppression method is not suitable for certain setups, prompting the proposal of a new strategy.
In a resonator fiber optic gyroscope (RFOG), a residual amplitude modulation (RAM) may appear with the light phase modulation used to generate the error signals, which are necessary for locking the frequency of the laser on the optical cavity resonance and measure the angular velocity. The RAM causes an unstable bias on the resonance frequency measurement and thus limits the gyro performances. A well-known method to suppress the RAM was introduced by Wong and Hall in 1985. The intensity of the modulated beam is monitored, before entering the resonator, to generate a continuous voltage controlling the natural birefringence of the modulator crystal. We show that this technique seems to be not adapted to setup with an imperfect polarizer (having a limited extinction ratio) at the output of phase modulator followed by component exhibiting polarization dependent losses. To counter this limit, we propose a new strategy and we illustrate its effectiveness with two types of phase modulator to probe a cavity resonance in transmission and reflection.
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