Reply To: Checking neff in FDE mode solutions – 3D Model

[Guilin Sun]

So you want to get neff of the taper? 

you can use FDE, sweep the size of the waveguide cross section then you can get neff vs width or height. Make sure you use fixed mesh size and the change of the size is multiple of the mesh size.

EME and FDTD are propagators, not for mode analysis.