Reply To: Arbitrary sign for eigen mode

[Guilin Sun]

 

I think the root cause of this is: some modes flips signs:

My tests show that in the following two cases the port modes are the same:

1: the ports do not shift;

2: using one waveguide

Why they change is hard say, as mentioned previously, we cannot control the didrection of mode direction.

I would like to check the actual device, and suggest that you manually check if the modes are the same.