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偏振噪声是谐振式集成光学陀螺的主要光学噪声源,其存在大大降低了系统的精度,为了定量化研究谐振式集成光学陀螺偏振噪声的产生机理,利用琼斯矩阵和光束传播法建立了谐振式硅基集成光学陀螺偏振噪声模型,该模型综合考虑了波导传输介质中的光偏振态交叉耦合、应力双折射等的影响,有效地逼近了实际的物理系统。基于上述模型得出了谐振腔内二氧化硅波导本征偏振态交扰与陀螺极限输出之间的表达式。对波导谐振腔内与偏振相关的3个因素:输入光偏振态、温度波动和波导保偏性能进行了仿真分析。并通过在输入端插入高偏振度起偏器的实验装置,有效验证了所建偏振理论模型受输入光偏振态波动影响的正确性。
Polarization noise is the main optical noise source of resonant integrated optical gyroscope. Its existence greatly reduces the precision of the system. In order to quantitatively study the generation mechanism of the resonant optical polarization of integrated gyroscope, the resonant silicon is established by Jones matrix and beam propagation method Based on the polarization-independent optical model of optical gyroscope, this model considers the effects of polarization polarization cross-coupling and stress birefringence in waveguide transmission medium and effectively approximates the actual physical system. Based on the above model, the expression between the intrinsic polarization state of the silica waveguide in the resonator and the limit output of the gyroscope is derived. Three factors related to polarization in waveguide cavity are analyzed: polarization state of input light, temperature fluctuation and polarization maintaining performance of waveguide. The correctness of the polarization theory model is verified by the polarization state of the input light through the experimental device with the high polarization polarizer inserted at the input end.