Ansys Learning Forum Forums Discuss Simulation Photonics How to simulate a big Si3N4 ring resonator in varFDTD or FDTD Reply To: How to simulate a big Si3N4 ring resonator in varFDTD or FDTD

Amrita Pati
Ansys Employee

Hi Minming,

It is hard to predict the reasons without actually having looked at the simulation file. Usually to confirm the validity of results, we recommend customers to perform convergence testing on different parameters. One of the main parameters, I would say is the mesh accuracy. Have you tried running the simulation for different mesh accuracies and compared the results? Is the screenshot that of transmission? I would recommend reducing the auto shutoff level of the varFDTD simulation (and run the simulation longer), looks like the transmission is going above 1. 

Regards,
Amrita