谐振式光子带隙光纤陀螺谐振腔方案设计

Analysis of Resonator for Resonant Optic Gyro Based on Photonic Bandgap Fiber

为提高陀螺系统的精度,设计并实现了基于光子带隙光纤的谐振式光学陀螺方案。对用于该陀螺的核心器件谐振腔进行了研究,仿真比较了反射式和透射式两种谐振腔的清晰度和信噪比,发现反射式的清晰度高、输出信号强度大,由此确定谐振腔采用反射式结构方案。以谐振腔极限灵敏度为优化参考值,根据谐振腔频率响应特性和陀螺数据输出特性,仿真优化了谐振腔腔长、耦合器分光比等结构参数。在极限灵敏度极值对应的最佳分光比为约0.5时,谐振腔长取30m,陀螺极限灵敏度达0.03(°)/h,完成光子带隙光纤谐振腔的理论设计。

To improve the precision of gyro system,the resonator based on photonic bandgap fiber used in photonic bandgap fiber resonant optic gyro system was designed and implemented in this paper.The different resonators which were the key components in the gyro were studied.The fineness and signal-to-noised ratio of reflecting structure and transmission structure were compared by simulation.It found that the reflecting structure had higher finesse and higher intensity of output signal than those of the transmission structure,so the reflecting structure was selected for the resonator.According to the frequency response characteristic and gyro output signal feature,the structure parameters which were fiber length,coupler transmissivity and others were optimized while existing loss coefficient was served as optimal reference. When the optimal splitting ratio relative to limited sensitivity is about 0.5,the fiber length is 30 mand the limited sensitivity can reach 0.03(°)/h.The theoretical design of the photonic bandgap fiber resonant has been completed.