Dear all,
I am trying to model EM wave propagation through a tapered step-index fiber. Because of the large size of my geometry and the symmetry of the problem I use the 2D axisymmetric settings. My fiber has a numeric port on one end and a small opening at the other. My problem is that the mode index and the e-field distribution at the port side i find with respectively the boundary mode analysis and the frequency domain study do not match the results I find when I run a mode analysis study in regular 2D on the port side of the geometry.
For example in the axisymmetric case I find a lower effective mode index from the boundary mode analysis study and I find a much more spread out mode with. Does anybody know how to setup a numeric port in the 2d axisymmetric case? Or how to properly compute the effective mode index for what is basically a line in the 2 axisymmetric case using the boundary mode analysis study?
Cheers!
Boris