Hello, I would like to design a grating coupler, so, I run the example that you have at Lumerical. In that example, the light goes from the fiber to the grating coupler. Also, in that example, finally, a CML model is created with the S parameters. But, my purpose is to design a coupler that the light will go from the grating coupler to the fiber. Also, I put a gaussian source (not a mode source, not ports). By using a movie monitor, I want to see that the light goes to the fiber at the angle of 10 degrees. But, when I open the movie monitor file, there is not any light that is transferred to the fiber. Could you please help me?
grating_coupler_2D_coupling efficiency optimization_best_solution.fsp (6.5 MB)
I could not upload the result from the video monitor but if you run the simulation you will see that no light goes to the fiber.