Modeling of asymmetric Rib SOI waveguide for optical communications applications

Asymmetric SOI waveguide is suggested and analyzed in this paper. The total height and the total width of the proposed waveguide are 1 µm and 1.5 µm, respectively. Asymmetric SOI platform consists of a layer of silicon with a thickness of 0.2 µm over an insulating material (silica) with a thickness of 0.35 µm and a rib with height of 0.35 µm . The rib is divided into two parts. First part contains a layer of silicon and extending from the silica layer substrate and the second part contained (SCHOTT N-BK7) material. The width and height of the rib of the waveguide has been changed many times. Some properties of SOI slab such as the effective refractive index, propagation length and losses have been studied and calculated using the finite element method (FEM) and the supposed waveguide is modeled by using COMSOL Multiphysics software.