AMPLITUDE-IDENTICAL NONLINEAR TE0 FUNDAMENTAL WAVE IN A SYMMETRICAL PERIODIC REFRACTIVE-INDEX STRUCTURE WITH 2 NONLINEAR CLADDINGS

Expressions describing field profile, dispersion relation, and propaga tion power are presented for nonlinear TE waves in a symmetric periodi c refractive index structure with two nonlinear claddings beside the g uide core. In terms of these formulas, the shape of the field profile of the symmetric nonlinear TE0 fundamental wave is investigated. We fi nd that three shapes of the field profiles of the symmetric nonlinear TE0 fundamental wave exist in the symmetric periodic refractive index structure, and one of them has identical amplitudes in the guide core. The effects of the structural parameters on the amplitude-identical n onlinear if, fundamental wave are analyzed, and relative field profile s are illustrated. The results show that when the structural parameter s (e.g., the core thickness, the well number, and the ratio of the wel l thickness to the periodic length) and the propagation power (and hen ce the effective refractive index) are selected at appropriate values, the amplitude-identical nonlinear TE0 fundamental wave can be formed in the symmetric periodic refractive index structure with two nonlinea r claddings beside the guide core. (C) 1998 Society of Photo-Optical I nstrumentation Engineers.