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For realizing an all optical photonic crystal (PhC)-based Arithmetic Logic Unit (ALU), one needs an optical 4 to 1 digital multiplexer. This device is a logic circuit in which by using two control ports one can connect four input lines to the output port. In this paper we used nonlinear ring resonators combined with optical waveguides to realize an optical digital multiplexer inside two dimensional PhC structure. The final structure was simulated using finite difference time domain method. The simulation results show that the maximum time delay of the final structure is about 3 ps.

A proposal for all optical digital multiplexer using photonic crystal-based nonlinear ring resonators