Hi Marton,
No worries. Thanks for the clarification. I don’t think you will be able to do that with FDE. FDE just calculates the eigenmodes of a waveguide at a given cross-section. Then you can calculate the far-field projection of each of these modes. For the interference, I believe you would have to propagate the modes a certain distance to see the fringes. This can be done in other solvers like FDTD. But let me double check with my colleagues and get back to you.
Regards,
Amrita
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