Simulation of optical NOT gate switching by sum-frequency generation in LiNbO3 waveguides

Optically gated switching is simulated numerically by exploiting sum-frequency generation (SFG) in periodically poled LiNbO3 waveguides. The impacts of launched control signal parameters and waveguide length on the switching extinction and speed are analyzed and discussed. The results indicate that high switching extinction and speed can be potentially achieved by choosing appropriate control signal power and its pulse width. The short LiNbO3 waveguide is suitable for enhancing the device performance.