August 24, 2021 at 3:49 am
Chih-Hao Chen
Ansys Employee
您好 看您的結構像是EME模擬。 如果是這樣的話，可以檢查耦合區解出來的本徵模是否合理。 此外，可以試著把波導寬度變化區的cell數目加大，或是mode數目加大。 如果還是沒有幫助，有可能需要檢查一下設計。 您可以參考以下範例的設計方式
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Evanescent waveguide couplers

https://support.lumerical.com/hc/en-us/articles/360042304694-Evanescent-waveguide-couplers
One method to make waveguide or fiber couplers is to use straight sections of the guides where the evanescent…