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用时域有限元差分的子域合成法(Synthetic subdomain method of FDTD)对大规模的光波导模拟,把仿真的光波导划分成两个或多个区域,在不影响仿真精度的条件下,删除对仿真对象影响不大的区域,并相应改变吸收边界条件进行时域有限元差分法数值模拟,考查光的传播和损耗状况,并与常规方法的运算结果相比较,结果一致且不影响计算精度。与常规方法相比,两段子域合成法所占内存约为前者的55%,时间约为前者的60%,三段子域合成法所占内存约为前者的31%,时间约为前者的28%,可见子域合成法比常规方法更有利于应用于大规模集成光波导的数值模拟仿真,对节省硬件及时间资源具有实际意义,提高工作效率。
Synthetic subdomain method (FDTD) is used to simulate large-scale optical waveguides. The simulated optical waveguides are divided into two or more regions. Without affecting the accuracy of simulation, The influence of the simulation object on the area is not obvious. The absorbing boundary conditions are changed correspondingly to simulate the finite element method in time domain. The propagation and loss of light are examined. Compared with the conventional method, the results are consistent and the calculation accuracy is not affected. Compared with the conventional method, two sub-domain synthesis accounted for about 55% of the former memory, the time is about 60% of the former, three-stage sub-domain synthesis accounted for about 31% of the former, the time is about the former 28 %, Visible subdomain synthesis method is more conducive to the numerical simulation of large-scale integrated optical waveguide than conventional methods, which has practical significance for saving hardware and time resources and improves work efficiency.