Simulating More than Two Orthogonal Modes in INTERCONNECT

- July 24, 2023 at 1:24 pm
  
  Aneek James
  Subscriber
  
  Hello all,
  Is there a way to change interconnects settings such that more than 2 orthognal modes are supported at any given time? It seems like it default assumes you'd only be interested in a TE and TM like mode, but what if you wanted to simulate more than just these two? When I load an s parameter file (generated from an FDTD sim) with 3 modes defined, the ONA element only shows the results for the first two modes, but not the last one.
  Thanks!
- July 26, 2023 at 10:30 pm
  
  Dev
  Ansys Employee
  
  Hello,
  ONA will show results for the mode corresponding to the orthogonal identifier. If you like to visualize mode 3, change the value to 3 and run the simulation.
  You can find more information on ONA here : Optical Network Analyzer (ONA) - INTERCONNECT Element – Ansys Optics
  Thank you.
  - July 27, 2023 at 3:44 pm
    
    Aneek James
    Subscriber
    
    So this works for modes 1 and 2 but not 3. When I do this for mode 3, it says that no results are saved:
    Similarly, when I launch from the other input port I only see the results for two modes:
    So it seems to be ignoring the third mode defined in the .dat file.
- July 27, 2023 at 3:54 pm
  
  Dev
  Ansys Employee
  
  This seems like no mode 3 data in S-parameter file. I tried with my simulation and I am getting result. Can you doble check S-parameter file?
- July 27, 2023 at 3:57 pm
  
  Aneek James
  Subscriber
  
  The .dat file was generated from an S-parameter sweep, so it should be formatted correctly. I'm checking and there's data for each port and mode as expected. The data in the file also matches the data I saw in the vizualizer in FDTD.
  I can't upload the file for CUI reasons, but can you upload the .dat file that you're using? So I can compare what's different?
- July 27, 2023 at 4:03 pm
  
  Dev
  Ansys Employee
  
  We cannot download any file. But I can definitely try simulating a similar device and test. Which component are you using to generate S-parameters? Please let me know.
- July 27, 2023 at 4:06 pm
  
  Aneek James
  Subscriber
  
  I don't think I can mention what device it is, but showing me how this would work for a multi-mode waveguide that supports 3 modes would help.
- July 27, 2023 at 10:03 pm
  
  Dev
  Ansys Employee
  
  I generated S-parameter of MMI splitter. Then I run a simulation using that S-parameter in interconnect. I am getting results without any problem.
  Make sure generated S-parameter does have mode 3 data.