Learning Forum

[wuhao zhang‘’]

老师您好，我在mode里进行仿真，选用TE基模，第一次设置波长1.5-1.6um,第二次1.4-1.6um,对比发现波长重叠部分结果不一致，请问是什么原因？

[Guilin Sun]

这是因为材料拟合、网格尺寸以及PML可能不同造成的。之前我写过一个帖子

Ansys Insight: 光谱宽度会影响同波长的透过率吗？分段仿真如何得到光滑的结果

目前不工作，你可以找一下国内一些网站看看有没有。

基本设置是：固定材料拟合与网格计算的波长范围相同。简单的操作是这样：

你试一下。

有时也可能需要修改PML。

 

[wuhao zhang‘’]

老师您好，我按照您的建议修改了设置，无明显变化，且PML使用Standrd,增加到14层，也无明显变化，请问还有什么方法使谱线平滑？

[wuhao zhang‘’]

器件长度在1600um左右，这个会不会有影响？

[Guilin Sun]

14层太少，你用32，48 或者64 层看看。

器件长应该增加仿真时间，让autoshutoff min 决定何时停止仿真。

参见

Ansys Insight: 为什么说仿真时间要足够长才能得到正确的频域结果

[Joy Marry]

Hello! Inconsistent results in the overlapping wavelength portion may be caused by differences in simulation models or parameter settings. Please check the following possible causes:

Model settings: Make sure you use the same model settings in both simulations, including material properties, boundary conditions, light sources, detectors, and other relevant heardle parameters.

Discretization parameters: Ensure that the same mesh density and discretization parameters are used in both simulations. Different grid settings can lead to inconsistent results.

Wavelength range: The choice of wavelength range may affect simulation results. Make sure your wavelength range covers the spectral range of your interest.

Numerical stability: When simulating over a wide wavelength range, smaller time steps or other numerical tricks may be required to ensure simulation stability.

Initial conditions: Check that the initial conditions are the same, including the excitation mode and the initial distribution of the fields.