The light wave stops propagating in EME.

- November 3, 2022 at 10:13 pm
  
  h.senyue
  Subscriber
  
  I use a taper structure to simulate a mode convertion from mode6 in port1 to mode6 in port2, it is the TE2 mode converting to TM3 mode. However, when I sweep the length of the taper in EME. I found the S parameters have a vertical decrease. And the optical field seems like the light stop propagating. It is weird. I can see the mode conversion is there, but I am confused about the results. I have changed the Cell number but it made no sense.
- November 4, 2022 at 2:26 pm
  
  Guilin Sun
  Ansys Employee
  
  Please make sure you plot abs(S) or abs(S)^2.
  From the profile monitor, it seems the fields are strongly discontinuous. Please check the overlap and power quantities in the later part, and check if the desired modes exist. You may need to modify the number of modes or groups or number of cells. make sure the port size is proper to capture the modes without truncation.
  More convergence testing techniques can be found here:
  Convergence Testing - Introduction
  Convergence testing process for EME simulations
  EME Convergence Testing - An Intuitive Approach
  - November 5, 2022 at 3:00 am
    
    h.senyue
    Subscriber
    
    It comes to the right result after I increase the mode number in each cell. Really appreciate for your help!
- November 4, 2022 at 6:32 pm
  
  Guilin Sun
  Ansys Employee
  
  Later please post any questions related to Lumerical products in the Photonics forum:https://forum.ansys.com/forums/forum/discuss-simulation/photonics/

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