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Ansys Learning Forum Forums Discuss Simulation Optics FDTD:: simulation of directional coupler Reply To: FDTD:: simulation of directional coupler

Guilin Sun
Ansys Employee

You can enforce the mesh to be symmetry if the coupling center is at the symmetry point: 

Plane monitors can be at the center plane, or where you think the scattering is strong. You can extend the monitors to the inside of PML:

 

 You first need to identify what causes the diverge. You may also use a monitor monitor.