Optical logic OR-AND-NOT and NOR gates in waveguides consisting of nonlinear material

Optical logic gates for OR, AND, NOT, and NOR operations in waveguides cons isting of nonlinear material are numerically investigated by means of FD-BP M (Finite Difference Beam Propagation Method). The proposed devices are des igned utilizing the self-routing characteristics of nonlinear X-crossing st ructures when they are operated with one input beam or two. The numerical s imulations show that the proposed structures can favorably be applied to op tical data processing and computing as fundamental logic gates.