EXCITATION ANALYSIS OF SYMMETRICAL TE0 WAVES GUIDED THROUGH SYMMETRICAL KERR-LIKE NONLINEAR SLAB WAVE-GUIDES

This paper deals with the excitation of a symmetric TE0 mode by a Gaus sian beam in a symmetric five-layered slab waveguide made of a self-de focusing nonlinear layer sandwiched by two self-focusing nonlinear lay ers. 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 b eam incidence on waveguides with several different core thickness valu es are derived by means of the finite difference beam propagation meth od. By comparison of this solution with the analytical solution, examp les of waveguides that enable excitation less likely to be affected by the axial offset of the incident beam are found. The selection condit ion for an incident beam width providing a high excitation efficiency is obtained. Further, it is shown that in these waveguides the symmetr ic TE0 mode can be more efficiently excited than in a three-layered sl ab waveguide with self-focusing nonlinear core. (C) 1997 Scripta Techn ica, Inc.