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Novel boundary condition for the finite-element solution of arbitrary planar junctions

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3 Author(s)
M. I. Davanco ; Sch. of Electr. & Comput. Eng., Univ. Estadual de Campinas, Sao Paulo, Brazil ; C. E. Rubio-Mercedes ; H. E. Hernandez-Figueroa

A novel boundary condition for a two-dimensional finite-element method (2D-FEM) is developed to simulate accessing waveguides to planar optical junctions. This new boundary condition is based on a paraxial approximation to the field's derivatives over the junction's ports. The formulation is very easily adapted within the 2D-FEM framework while providing good simulation results. Two examples are provided to show the applicability and reliability of the present method: a waveguide step discontinuity and a sharp waveguide bend.

Published in:

IEEE Photonics Technology Letters  (Volume:13 ,  Issue: 1 )