what is the form correct to put the region FDE in the simulation or to do the simulation?

Gerard08Gerard08 Member Posts: 1

Hi everyone, I have got a problem with the region of FDE, I did the simulation of nitride rib waveguide on the silicon substrate

with a bottom cladding of air, I put the region of FDE with the silicon substrate and without a substrate of silicon, the results of mode loss are so different, so, what is the form correct to put the region FDE in the simulation or to do the simulation? 


Thank you so much!!!

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