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Ansys Learning Forum Forums Discuss Simulation Photonics FDE simulation shows negative effective refractive index Reply To: FDE simulation shows negative effective refractive index

Amrita Pati
Ansys Employee

Hi Victoria,

My first thought is that the simulation span (especially in the y-max direction) has to be properly set to avoid this. But my first question is, when you uncheck the "correct backward propagating modes", are you seeing gain?

Regards,
Amrita