I am trying to find the coupling efficiency from a fiber to an inverse taper waveguide in Lumerical MODE EME . For that I am trying put two 2D EME monitors to get field profiles (E, H): one at the fiber and another at the waveguide (output section). I want to calculate the poynting vectors, and from there, power at that two monitors. I would like to see how much power is coupled finally, from fiber to the output waveguide and what percentage of input power that is. I also used two sets of data: 1) From the two EME monitors 2) The field profile at the port. My questions are:
Q1. I wrote code based on script given in Working with the Poynting Vector . Does this same method/code works for MODE EME monitors/ports?
Q2. When I change the inverse taper length ( or propagation distance) in EME analysis window (‘group spans’ in cell group definition), does the monitor at the waveguide shifts too according to the propagation length? Because I did not get any difference in the power calculated for two different length (10 um, 1000 um). I expect the power at the output waveguide to be less since there will be loss if the inverse taper size is smaller. In that case, Can you please take a brief look if I am writing the code correctly (pls see the attached lsf code file)?
Q3. Lastly, I also tried the same thing with Field profile from port 1 (input) and 2 (output). To my surprise, I got the power at two monitor to be same, even output waveguide have slightly higher power (ratio = 1.0019 something). Do you think the port method should be used or the monitor method?
I am sorry for the long post and I really appreciate your help. Thanks in advance.