Hi everyone. I’m trying to simulate the coupling region for a ring region so I can get an approximation of the value for the coupling coefficient. I’ve already have the asymmetric coupling script working properly and I’m currently in the process of sweeping for different radiuses and gap sizes in order to get the S-parameters matrix. I’ve attached the analysis script so you can take a look at it. It’s basically the default one that comes up with the asymmetric coupler FDTD file. I am not sure how to proceed and figure the coupling coefficient I need. Basically the whole simulation is run twice for two different cases when the light is being coupled in the ring and the other case of the light coupling from the ring to the waveguide. The results come in two set of matrixes, one which has all values equal to 0 and the other one with a graph showing 4 matrix elements plotted.

I’m not sure how to proceed to extract the S-Params from these. Can anyone help me out