{"id":377656,"date":"2024-08-08T07:16:31","date_gmt":"2024-08-08T07:16:31","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/ring-resonator-transmission-in-the-ring-is-greater-than-1\/"},"modified":"2024-08-08T07:17:34","modified_gmt":"2024-08-08T07:17:34","slug":"ring-resonator-transmission-in-the-ring-is-greater-than-1","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/ring-resonator-transmission-in-the-ring-is-greater-than-1\/","title":{"rendered":"Ring Resonator: Transmission in the Ring is greater than 1"},"content":{"rendered":"

Hello,<\/p>\n

I tried to simulate a ring resonator adapted from the given example with varFDTD. 
The calculated forward transmission at the end of the waveguide seems to be fine. However, inside the ring resonator transmission values of more than 1 are achieved. The transmission values also seem to increase with the simulation time.
Simulation times of 30000 and 100000 fs have been tried and the simulation status was 1. For the longest simulation time the oscillations have diminished significantly for the forward transmission into the end of the waveguide, but the transmission inside the ring resonator are still too big.
The standard PML boundaries have been used. <\/p>\n

Could you recommend changes I could try, like increasing the PML layers? Or could the simulation time still be too small?<\/p>\n

Kind regards.<\/p>\n

 <\/p>\n

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