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无源环形谐振腔(Passive ring resonator,PRR)是谐振式光学陀螺(Resonator optic gyros,ROG)的核心敏感器件,其光学传递函数的半峰全宽是决定陀螺标度因子的重要因素之一。根据多光束干涉理论,耦合系数将通过对反射式无源环形谐振腔的半峰全宽的作用而影响陀螺的标度因子。根据耦合模理论和调频检测原理,以标度因子最优为判据,推导了一般情形下耦合系数对标度因子的影响,论证了最佳耦合系数的存在与确定方法,并进行了仿真验证。结果表明,光纤陀螺中5%左右的最佳耦合系数取值不具有普遍意义,为较高波导传输损耗的聚合物集成光学陀螺结构优化提供一种新的思路。
Passive ring resonator (PRR) is the core sensitive device of Resonator optic gyros (ROG). The full width at half maximum of the optical transfer function is one of the important factors that determine the scale factor of gyroscope. According to the theory of multi-beam interference, the coupling coefficient will affect the scale factor of the gyroscope by acting on the full width at half maximum of the reflective passive ring resonator. According to coupling mode theory and FM detection principle, the influence of coupling coefficient on scale factor is deduced based on the optimal scale factor criterion. The existence and determination method of optimal coupling coefficient is demonstrated and verified by simulation . The results show that the optimal coupling coefficient of about 5% in FOG is not universal, which provides a new idea for the optimization of structure of the integrated optical gyro with higher waveguide loss.