I have a problem with using the bend analysis model. My customized file is attached to this discussion. My primary concern is that I am getting a decrease of bending loss with more bending, i.e., smaller the bending radius, which is obviously false.
In fact, these values are both smaller than that of without bending,
When I tried with the original example waveguide_bend.lms, I find the correct correlation, i.e. bending loss increases with more bending. Also, the power coupling does seem to decrease in the right direction but I am really puzzled by the loss here.
I read posts regarding boundary conditions and mesh cell size, thickness etc. but this does not seem to avert the false trend. Could you give me an insight on this? (The second file is the original example from Lumerical)