Abstract
The Resonant Integrated Optic Gyroscope (RIOG) is a type of high accuracy gyroscope based on the Sagnac effect. A symmetrical resonance curve is very important to the performance of the RIOG. To further investigate and design a RIOG with a waveguide ring resonator, an in-depth research of the asymmetric resonance curve and its influence on the RIOG is fully developed. Four possible optical noises inducing the resonance curve asymmetry are analyzed and their mathematic models are established. These four optical noises are the normal mode effect, the backscattering noise, the backreflection noise and the polarization noise. Any asymmetry of the resonance curve will not only induce a large output bias error into the gyro output, but also seriously decrease the frequency discrimination parameter of the demodulation curve. By using a tunable fiber laser, the high aspect ratio silicon nitride WRR and the silicon dioxide WRR were tested. The experiment measured resonance curves can be well fitted with the theoretical simulation results. The experimental results show that a high aspect ratio silicon nitride waveguide can effectively suppress the polarization noise in the RIOG.
Highlights
Optical gyros based on the Sagnac effect are attractive sensors for inertial navigation systems [1,2,3,4].both the Fiber Optic Gyroscope (FOG) and Ring Laser Gyroscope (RLG) have some serious disadvantages, as they are bulky, expensive, and energy intensive [5,6,7,8]
In order to overcome these shortcomings in traditional optical gyroscopes, the Micro Optic Gyroscope (MOG), which includes the Resonant Integrated Optic Gyroscope (RIOG) and the Interferometric Integrated Optical Gyroscope (IIOG), based on a waveguide ring resonator (WRR) was proposed [9,10,11,12,13,14,15,16]
The and the demodulation signal is fed back to the proportional integrator (PI) to lock the laser frequency demodulation output of the LIA2 is proportional to the angular velocity and the rotation rate can be at the resonant frequency of the CCW lightwave
Summary
Optical gyros based on the Sagnac effect are attractive sensors for inertial navigation systems [1,2,3,4]. The key to further noise sources including the normal requiring mode effect, backreflection the backscattering noise, improve the performance of the is to suppress the optical noise. The mathematic model of the RIOG base on a wave phasenoises modulation resonance curve, a parameter of resonance asymmetry degree is sinusoidal defined. To quantitatively characterize the asymmetry of backreflection the resonance were established, including the normal mode effect, the backscattering noise, the curve, a parameter of resonance defined. On the basisdegree of theistheoretical simulation established, including the normal mode effect, the backscattering noise, the backreflection noise and the recommendations are given.
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