压力作用于LiNbO_3脊形波导的模场分析

The mode field analysis of pressure acting on the LiNbO_3 ridge waveguide

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 achieve the optical waveguide pressure and acceleration sensor based on the photo-elastic effect, the change of the mode field in the photo-elastic waveguide needed to be known. According to the crystal photo-elastic effect theory, it is analyzed the changes of the refractive index under pressure in the LiNbO3 M-Z ridge waveguide. Also, the guided mode field in the waveguide is simulated through 3D-FD-BPM. Additionally, in this article it is used the electromagnetic theory of the optical waveguide to carry the analysis on the simulation results. The conclusion is obtained by the simulation and the analysis result., under the pressure, the waveguide＇ s refractive index increases, the model field in the waveguide increases, and the confinement that the waveguide to the optical wave energy enhances.