A novel proposal for all-optical compact and fast XOR/XNOR gate based on photonic crystal

Abstract

In this paper, we aim to design an all-optical device, which can perform XOR and XNOR functions in a single structure. The proposed structure will be realized by cascading two nonlinear resonant rings. The functionality of the proposed structure is based on controlling the optical behaviour of optical rings via optical intensity. The final structure has one bias and two input control ports, along with two output ports. One port acts as an XOR and the other acts as an XNOR gate. The maximum delay times for the XOR and XNOR gates are 1.5 and 2.5 ps, respectively. Therefore, the working bit rates for the XOR and XNOR gates are 666 and 400 Gbit/s, respectively.