Field intensity and power confinement of four-layer slab waveguides with various refractive index profiles in the guiding region

Abstract

Relative field intensity distributions in three different types of structures, i.e. Step index Slab Waveguide (SSW), Semi-parabolic index Slab Waveguide (SPSW) and Parabolic index Slab Waveguide (PSW) have been analytically derived and computed. It is found that the field in the guiding region is maximum in case of the PSW structure. Analytical expressions for the relative power confinement factors have also been obtained. The applicability of these results in the estimation of coupling coefficient of some of the Distributed Feed Back (DFB) lasers have also been briefly shown. © by Fachverlag Schiele & Schön 1994