关于port计算微环耦合率的问题

- April 3, 2023 at 7:45 am
  
  byzhan
  Subscriber
  
  老师您好，我想计算直波导到微环在TE0模式的耦合系数，但是当我以直波导上的port 1作为光源，微环上的port 2作为监视器计算S参数得到的结果和以微环上的port 2作为入射光源，直波导上的port 1作为监视器计算S参数，为什么两者的计算结果会有差别呢？两个端口计算耦合系数应该是互易的，计算的结果应该一致才对。
- April 4, 2023 at 10:06 pm
  
  Guilin Sun
  Ansys Employee
  
  你是怎么定义耦合率与耦合系数的？如果是按功率透射计算，这种耦合是指激发波导模式的功率有多少被耦合到了另一个输出波导指定模式。目前你是看的abs(S)^2 吗？差别多大呢？由于其中一个Port是在弯曲波导上，应该有一定的弯曲损耗，不可能完全100%互易。你如果仿真半圆可能差别更大。
- April 5, 2023 at 3:07 am
  
  byzhan
  Subscriber
  
  是的老师，我的耦合系数定义为abs(S)^2，然后port1和port2中的模式都是设置为TE基模，同时我也仿真了半圆，但是在半圆下，分别用port1和port2作为入射光源，port2和port1作为监视器计算耦合系数的话，两种方式算出来的结果几乎一致，但是只仿真耦合区域这一部分的时候，差别就很大，是不是和port2在微环上设置了旋转角有关系？因为在只仿真半圆的时候，port无需设置旋转角。
- April 5, 2023 at 3:34 pm
  
  Guilin Sun
  Ansys Employee
  
  那你要检查耦合区仿真时，光源位置对应的旋转角是否正确。你这两次仿真的器件不一样啊，先就一个器件仿真比较看看。如果可能，光源几何面积应该大一些，保证不将光源模式切割。可以用对数坐标显示，看看光源边缘强度是否足够低。比如低于1E-6 或者更小。另外你也监测其它两个端口，看看功率是否守恒为1.

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