Hi Jason,

I suppose you are using the FDE to calculate the modes of a bend. FDE is just used for optical simulation so, you won't be able to apply voltages. First, you can use the CHARGE solver to do the electrostatic simulation. But then, depending upon the material, you have to calculate the perturbed indices due to the applied voltage. These pertubed indices are then included in FDE to calculate the modes. For example, we have an example on Lithium Niobate waveguide, where we perform the electrostatic simulation in CHARGE. We obtain the electric field distribution for each applied voltage. Then we use Pockels formulation to calculate the perturbed indices due to electric field and import them to FEEM (FEM equivalent of FDE) to determine the eigenmodes.

Here are some examples that you might find useful:

Regards,

Amrita