Abstract
This experiment demonstrated the resonance asymmetry phenomenon in the resonant fiber optic gyro. The asymmetry of resonant curve affects the system open-loop bias and its stability, which directly affects the accuracy of angular velocity measurement. In this paper, a new mathematic model is established. The influence of the coupler normal mode loss difference (the phase difference between the coupler cross port output optical field and direct port is less than the ideal π/2) on the symmetry of resonant curve, the resonant signal modulated by the triangular wave, and the demodulation curve are analyzed. Moreover, the asymmetry of the resonant curve leads to the asymmetry of the resonant signal, as modulated by the triangular wave and the demodulation curve from the theoretical simulation and the experiment.
Highlights
Gyro is an inertial sensor for the rotation rate measurement [1]
A coupler with low/high coupling coefficients can be used into a fiber ring resonator (FRR) of the resonant fiber optical gyro; the phase difference between the coupler cross port output optical field and direct port is less than the ideal π/2, resulting in the asymmetry phenomenon of the resonant curve
The influence of the normal mode loss difference of the coupler on the symmetry of the resonant curve, the resonant signal modulated by the triangular wave, and the demodulation curve are all analyzed in detail
Summary
Gyro is an inertial sensor for the rotation rate measurement [1]. At present, fiber optic gyro, micro-optic gyro, laser gyro has great development potential because of its own advantages [1,2,3,4,5,6,7,8]. If the resonant curve is asymmetric, the demodulation curve is asymmetric, which will result in the laser’s center frequency being unable to be locked to the resonance frequency of one of the light waves This phenomenon affects the system open-loop bias and its stability, which directly affects the angular velocity measurement accuracy. A coupler with low/high coupling coefficients can be used into a FRR of the resonant fiber optical gyro; the phase difference between the coupler cross port output optical field and direct port is less than the ideal π/2, resulting in the asymmetry phenomenon of the resonant curve. The influence of the normal mode loss difference of the coupler (the phase difference between the coupler cross port output optical field and direct port is less than the ideal π/2) on the symmetry of the resonant curve, the resonant signal modulated by the triangular wave, and the demodulation curve are all analyzed in detail. The asymmetry of the resonant curve will lead to the asymmetry of the resonant signal modulated by the triangular wave and the demodulation curve from the theoretical simulation and the experiment
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