Performance analysis of all-optical full-adder based on two-dimensional photonic crystals

An all-optical full-adder device is implemented using a two-dimensional photonic crystal waveguide. The design of the full-adder circuit is based on a beam-interference principle that utilizes a combination of Y- and T-shaped waveguide structures formed from silicon dielectric rods in air background. Available optical full-adder circuits are designed with either a semiconductor optical amplifier (SOA) or a nonlinear material. The proposed circuit has been implemented without using any nonlinear material and SOA to overcome previous limitations. Various combinations of inputs of the full-adder are used and optimized through multiple simulations. The difference in the output between logic 0 and 1 has been optimized to reduce the error probability in their identification. The simulated outputs are also verified with the help of the electric field intensity distribution at wavelengths near 1550 nm for different input combinations of the full-adder. Moreover, the proposed full-adder structure has very fast response time of 1.06 ps.