You are welcome, Chenxi!
If you edit the analysis group, then go to Analysis--Variables, there should be a variable called "target wavelength", is there any chance that this value is set to something other than 1.55 um:
If yes, I would recommend changing it to 1.55 um and then recalculating the overlap. If it is already 1.55, let me know, I will try to think if there is any other reason that this could be happening.
Regards,
Amrita
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