磷酸盐玻璃条形波导模场特性的FDTD数值模拟

FDTD Numerical Simulation of Mode Field Characteristic of Strip Waveguide Based on Phosphate Glass

应用时域有限差分(FDTD)法,对以相同的磷酸盐玻璃为基质的两类条形光波导:沟道型和掩埋型波导的模场特性进行了数值模拟比较,激励源都分别采用了1.54μm正弦平面波和1.54μm高斯光波,得到与理论相符合的光波传播模式,发现光波在掩埋型条波导中形成稳定模式所用时间比在同样大小的沟道型条波导中更短,并证实了波导中的光波模式仅取决于波导结构与光波波长。

The mode field characteristics of channel strip optical waveguide and buried strip optical waveguide based on the same phosphate glass had been simulated and compared by using finite-difference time-domain (FDTD) method. 1.54 μm sine plane wave and 1.54 μm Gauss wave were chosen as the stimulating source for the two types of waveguides. The light wave mode acquired from numerical simulation was consistent with waveguide theoretics. It was found that the time used to form steady mode in buried strip optical waveguide was shorter than that in channel strip optical waveguide for the same dimensions. It was substantiated that light wave mode depended on waveguide configuration and wavelength merely. The figures drawn employing FDTD method were explicit. All these were applicable to devising and optimizing optical waveguide.