Excitation analysis of symmetric TE0 waves guided through symmetric Kerr-like nonlinear slab waveguides

Abstract

This paper deals with the excitation of a symmetric TE0 mode by a Gaussian beam in a symmetric five-layered slab waveguide made of a self-defocusing nonlinear layer sandwiched by two self-focusing nonlinear layers. First, the analytical solution for the symmetric TE0 mode and the relationship between the power and the effective index of refraction are derived. Next, the propagating waveforms in the case of Gaussian beam incidence on waveguides with several different core thickness values are derived by means of the finite difference beam propagation method. By comparison of this solution with the analytical solution, examples of waveguides that enable excitation less likely to be affected by the axial offset of the incident beam are found. The selection condition for an incident beam width providing a high excitation efficiency is obtained. Further, it is shown that in these waveguides the symmetric TE0 mode can be more efficiently excited than in a three-layered slab waveguide with self-focusing nonlinear core. © 1997 Scripta Technica, Inc. Electron Comm Jpn Pt 2, 80(5): 24–30, 1997