论文部分内容阅读
为了实现基于光弹效应的光波导压力和加速度传感器,需要了解光弹波导中的模场变化。根据晶体的光弹效应理论,分析了在压力作用下M-Z结构LiNbO_3脊形波导中折射率的改变,采用三维FD-BPM法对光弹波导中的导模场进行仿真,并运用光波导的电磁理论对仿真结果进行分析。由仿真及分析结果得出:在压力的作用下,波导的折射率增加,波导中导模光场增大,并且波导对光波能量的约束作用增强。
In order to realize the optical waveguide pressure and acceleration sensor based on the photoelastic effect, it is necessary to know the mode field variation in the photoelastic waveguide. According to the photoelastic effect theory of crystal, the change of refractive index in LiNbO_3 ridge waveguide with MZ structure under pressure was analyzed. The guided mode field in photoelastic waveguide was simulated by three-dimensional FD-BPM method. Theoretical analysis of the simulation results. The results of simulation and analysis show that under the action of pressure, the refractive index of the waveguide increases, and the guided mode light field in the waveguide increases, and the confinement effect of the waveguide on the light energy increases.