Lumerical Interconnect simulation result

- March 11, 2022 at 8:06 pm
  
  goldenalcheese
  Subscriber
  
  Hi,
  When I run my circuit (containing Phase shifter and Waveguide coupler) for the first time, I obtain a weird transmission figure. I check the simulation log on the bottom, and notice that there are several warnings like 'no s parameters found'.
  However, when I run it the second time, then it goes fine, and I obtain the desired figure. As in this case, I am only using it as a pure waveguide, so I obtain a flat transmission figure always equal to 1.
  All my simulation results are attached. I am wondering what is happening? Why are the first time and the second time different? And why is the s parameter not found the first time?
- March 23, 2022 at 4:04 am
  
  Guanhui Wang
  Ansys Employee
  
  Hi goldenalcheese
  The "no s-parameter found" warning message is a false alarm, and this is a known problem. You may ignore this warning. It is strange that you run the simulation twice and they gave you different reuslts. Could you please let us know more about this problem?

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