定向耦合器的port端口的S参数与透射率相差很大是什么原因导致

- August 28, 2023 at 9:43 am
  
  chen chen
  Subscriber
  
  请问老师，我在仿真微环的耦合区（等效于DC）时，发现同一个port的S参数的abs^2和其透射率T的差距非常大，并且我使用的波导宽度为500nm，理论上来说不会激发多模，结构如下：
  当左下角port作光源时，右下角的port的S参数abs^2如下：
  透射率T如下：
  请问是什么原因导致两者差距如此之大？
- August 28, 2023 at 10:29 pm
  
  Guilin Sun
  Ansys Employee
  
  如果S参数abs^2 与总透射率差别大，一般情况是：
  选择的模式错了；
  或者激发了其它模式。
  S是针对模式的，而总透射率是所有模式的结果。你可以多监测几个模式看看，另外也看看这些模式分别看看与你设想的是否一致。
- August 29, 2023 at 7:15 am
  
  chen chen
  Subscriber
  
  请问老师，那可以导出端口内所有模式的S参数在一个txt文件中吗
- August 29, 2023 at 4:58 pm
  
  Guilin Sun
  Ansys Employee
  
  不行，需要用脚本，参见
  Ansys Insight: 几个简单实用的脚本Script命令：用于结果分析
  Ansys Insight: 如何将结果数据如何保存成txt格式
  如果是为了Lumerical软件使用，建议使用Matlan格式(matlabsave) 或者LDF格式(savedata)，或者HDF5格式 https://optics.ansys.com/hc/en-us/articles/19055251802899

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