Hello,
Would you be able to tell me how many modes are you using in the two sections having the straight waveguides? Sometimes, when we have a large number of modes in the tapered section, we also need to use a large number of modes for expansion in the straight waveguides so that the mode-matching is more accurate.Â
If you are using a lower number, can you try increasing this value, and then run this convergence test?
Regards,
Amrita
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