# Vector Finite Difference Mode Analysis

#1

Does the bent waveguide option in MODE solutions have a “Fully-vectorial finite difference mode solver”?
I need to apply this analysis to structures with cylindrical symmetry to find the mode effective index, distribution, and bending loss. Even with a simple silicon waveguide the bend radius can’t be decreased in MODE beyond 5 um. Is there any way to find the properties of a tightly bent waveguide?

#2

So, the trick is to set the simulation span to be less than the desired radius. I applied this to the attached file. Now, I can study the bend modes down to a radius of 2 um.