All-optical logic gates based optimized XY-branch waveguide utilizing SnO2 nonlinear material

Optical waveguide with XY-branch structure have been proposed in this paper as all-optical logic gates. SnO2 nanomaterial utilized as film material and PMMA as substrate material. SnO2 shows a large third order nonlinear susceptibility in range of 10
^-10
-10
^-12
esu, meanwhile, glass and silica fiber are only 10
^-14
esu. The proposed waveguide is designed to be the simplest form so it is easy to produce, but has as many as logical gate functions. Analysis is done by numerical simulation via Finite Difference Time Domain (FDTD) method with appropriate scattering boundary condition. The results show that XY-branch structure with SnO2 nanomaterial as film could really function as AND, OR, and ALWAYS ZERO logic gates with relatively low input power 0.3 W-0.5 W and relatively small size of length 5 mm and width 25 μm. Therefore, the proposed optical waveguide can favorably be applied to simple optical-signal processing in high capacity core network like wavelength converter.