Back reflection from port object
I am wondering how to get rid of back reflection from a port injecting the fundamental mode into a waveguide. An image of the issue is shown here. I have not done an extreme amount of convergence testing, but the spacing from waveguide to edge in x,y,z directions is greater than 1um, the mesh is 10nm in x,y,z, I'm using stabilized PML and the input port object spans the entire x,z FDTD region. There used to be a lumerical forum where an answer was given but I see that its taken down now. Any help would be appreciated.