I have been trying to repeat this example -> (https://support.lumerical.com/hc/en-us/articles/360042322794-Ring-modulator) with my parameters. But the thing is I get too high coupling coefficients in FDTD. So when I import the results into Interconnect there are very poor results.
Also I have noticed that the results depend on the numbers given to core width, core thickness and slab thickness.
In the example, the ring radius is 10 um and in my work it is twice smaller.
1) Why it is happening?
2)How those core width, thickness and slab thickness are affecting the results and how to know what are the proper values for those parameters?
Below there are screenshots from the results which I get: