FDTD仿真的耦合效率和FDE计算的重叠积分的关系的问题

- June 17, 2022 at 6:54 am
  
  johnnie_029
  Subscriber
  
  您好，我设计了沿着传输方向上紧密相连的两个波导，现在尝试计算这两个波导基模之间的耦合效率。首先我使用FDE计算了重叠积分最大的对准位置，然后在FDTD中设置以其中一个波导的基模为光源，向第二个波导中传输，使用监视器和模式扩展器查看了耦合到第二个波导基模的耦合效率；FDE计算的重叠积分和FDTD计算的耦合效率之间有误差，因为在文献中看到耦合损耗主要就是模式失配带来的，而模式失配可以用重叠积分计算。我想请问下这个误差是由于什么造成的呢？是因为这两个基模的有效折射率不匹配，带来了反射损耗吗？
  期待得到您的回复，万分感谢!
- June 24, 2022 at 2:45 pm
  
  Guilin Sun
  Ansys Employee
  
  重叠积分是一种简单快速评估耦合效率的指标，但并不等于真正的耦合效率，这两个结果有差别很正常。文献也都是泛泛而讲，并没有给出严格的数学推导和定义。你看看Overlap计算的推导过程，看看有什么假设，再与EME方法比较。有效折射率并不能精确计算反射率，否则就不要重叠积分或者再仿真耦合效率了。

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