The background index setting for FDE MODE solver

- November 27, 2023 at 7:11 am
  
  jianping.wang
  Subscriber
  
  Dear,
  Hello!
  When I refer to the example "Traveling Wave Mach-Zehnder Modulator", in the sep4 "to calculate the RF properties of the transmission line the MODE solver", i find the background index is 1.95 in FDE. From my understanding, the top of transmission line should be the air, so its setting is 1.Can you please help check this setting?
  Thank you very much!
  JP
- November 27, 2023 at 8:26 pm
  
  Amrita Pati
  Ansys Employee
  
  Hi Jianping,
  The background index here corresponds to the oxide box. Here for oxide in RF, we used a refractive index of 1.95.
  Regards,
  Amrita
- November 28, 2023 at 1:54 am
  
  jianping.wang
  Subscriber
  
  Thank you, Amrita.
  Have a good day.