Reply To: Loss of lithium niobate phase modulator

[kghaffari]

Hi Alessandro,

As you correctly mentioned, the mesh will be different if it not locked. I have the following recommendations to verify the effect that the mesh is having on your results:

A) Once you obtain the 10 loss with your permittivities, please keep the mesh locked but change the permittivity to obtain the loss again. The reason I’m suggesting this step is to make sure that your permittivity values are actually taking effect, while the mesh is locked. If the results don’t change it could mean that the original permittivity was not taking effect while the mesh was locked. Otherwise, please proceed to the next step.

B) If while the mesh is locked changing the permittivity demonstrates change in loss, then please repeat the simulation of unlocked mesh with a smaller mesh size. I expect the loss difference to be smaller for a more refined mesh (compared to the original 10db vs 1.5 db). In this step, it’s important to visualize the mesh to make sure a smaller mesh is actually generated. If you see no difference in the new mesh (while mesh is unlocked), try increasting the “max refine steps” under the mesh tab (in addition to reducing min and max edge length).

Hope this helps. Best regards,

Khash