关于叉指型PN结微环调制器的INTERCONNECT紧凑型模型的搭建的疑问

- April 15, 2023 at 2:33 am
  
  WENKAI YANG
  Subscriber
  
  老师您好，最近我在学习叉指型PN结MRM的搭建，目前想利用INTERCONNECT搭建出紧凑模型方便后续dynamic operating的实验。
  官网有关于这个案例的部分实验，URL如下：
  https://optics.ansys.com/hc/en-us/articles/360042327594-Interleaved-junction-microring-modulator
  
  叉指型PN结有着如下结构：
  
  可以看到这种PN结结构在环波导切线方向上是有周期性变化的，这样的话我们怎么计算这种波导的有效折射率呢，因为之后计算MRM的transmission distribution的话需要有效折射率。按照我以往的经验是用MODE中的eigensolver来计算波导截面的模式，获得对应的有效折射率；
  但是对于这种叉指型PN结这种类型的波导，使用MODE来计算是不是行不通的呢，请老师解惑，谢谢！
- April 21, 2023 at 7:27 pm
  
  Guilin Sun
  Ansys Employee
  
  既然要计算有效折射率，你应该是知道模式在哪里，大概什么分布，因此在FDE里做适当设置应该可以得到。
  如果有多个周期，可以使用周期边界条件；
  如果考虑掺杂，那么也必须是周期的，不能仅看几何形状的周期；要考虑掺杂，需要先用CHARGE 仿真载流子分布，然后输入到FDE中，比如：
  https://optics.ansys.com/hc/en-us/articles/360042327854-PIN-Mach-Zehnder-modulator
  https://optics.ansys.com/hc/en-us/articles/360042322794-Ring-Modulator

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