Hi,
I have the same problem. I want to simulate a rib waveguide (as in the attached file) for a 3D model. The rib is a single TM mode with a neff=3.538. If I try to simulate the same structure in 3D model I can see higher order modes at least for a propagation of 50microns. I think that it depends on the imput field chosen for the structure. I consider a boundary scattering condition at the imput port with a plane wave with E0y = 1V/m. It needs more than 50microns to propagate only the first mode. I can't consider longer waveguides because the limited memory of my computer.
I want to use the modal distribution of the first TM mode obtained by 2D model as the imput of the 3D model. Is it possible? I'm using a version of Comsol 3.5 RF module.
I hope someone could help me.
Thanks!
I have the same problem. I want to simulate a rib waveguide (as in the attached file) for a 3D model. The rib is a single TM mode with a neff=3.538. If I try to simulate the same structure in 3D model I can see higher order modes at least for a propagation of 50microns. I think that it depends on the imput field chosen for the structure. I consider a boundary scattering condition at the imput port with a plane wave with E0y = 1V/m. It needs more than 50microns to propagate only the first mode. I can't consider longer waveguides because the limited memory of my computer.
I want to use the modal distribution of the first TM mode obtained by 2D model as the imput of the 3D model. Is it possible? I'm using a version of Comsol 3.5 RF module.
I hope someone could help me.
Thanks!
