Mode Interplay via Quadratic Cascading in a Lithium Niobate Waveguide for All-Optical Processing

A. De Rossi, C. Conti, and G. Assanto

Opt. Quantum Electron. 29, 53-63 (1997)


The effects of the nonlinear interplay between modes of a Lithium Niobate channel waveguide are numerically investigated. Based on the nonlinear phase-shift obtainable via up- and down- conversion of each mode at the input frequency into and from the second-harmonic modes generated through Type I and Type II interactions, the waveguide can operate as an all-optical transistor with large small-signal-gain, and as a mode-mixing device capable of spatial switching and routing. It exhibits good switching contrast at 1.55 Ám with low driving powers