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提出具有高群有效折射率的双环级联作为核心元件的谐振式平面光波导陀螺结构,基于光学Sagnac原理得到了双微环耦合谐振式光学陀螺理论灵敏度与群有效折射率的一般表达式和双环与单环陀螺系统的灵敏度关系,并由耦合模理论方法得到了双环系统耦合器的两个透射系数对应的群有效折射率变化情况.在环腔半径R1=R2=100μm、环腔传输损耗系数t1=t2=0.95的情况下,针对环与环之间耦合器和环与波导之间耦合器透射系数对群有效折射率的不同影响,得到了最大群有效折射率的产生条件.采用文中参数(R=100μm,t=0.95)计算的单环谐振式陀螺灵敏度为(104—105) °/h,而双环级联谐振系统理论灵敏度能够达到10°/h.该研究对微环耦合谐振腔在角速度检测上的应用有重要的意义.
Based on the optical Sagnac principle, the theoretical sensitivity and effective refractive index of the double-loop coupled resonant optical gyroscope are obtained. The general expression of double ring resonators and double ring And the sensitivity of the single-ring gyroscope system, the group effective refractive index change corresponding to the two transmission coefficients of the two-ring system coupler is obtained by the coupled-mode theory method. When the ring cavity radius R1 = R2 = 100μm, the ring cavity transmission loss coefficient t1 = t2 = 0.95, the maximum effective refractive index of the group is obtained under the different influence of the transmission coefficient of the coupler between the ring and the ring and the ring and the waveguide on the effective refractive index of the group. (R = 100μm, t = 0.95), the sensitivity of single loop resonant gyroscope is (104-105) ° / h, while the theoretical sensitivity of double loop resonant system can reach 10 ° / h. The application of angular velocity detection is of great significance.