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