(2 + 1)D Soliton Pairs in a Planar Quadratic Nonlinear Crystal with Inhomogeneity

The process of formation and propagation of pulse pairs in a quadratically nonlinear crystal with two waveguides was investigated with varying parameters related to the position of the waveguides relative to each other, delay, and phase ratio between pulses. A change in the pulse propagation mode during the approach of waveguides and a dependence of the interaction between the pulses on the initial phase ratio were found.