Application of nonlinear photonic crystal ring resonators in realizing all optical OR/NOT/AND gates

Abstract

Arithmetic logic unit (ALU) is the core of any digital processing systems. For creating<br>an all optical ALU one needs basic logic gates such as optical NOT, OR and AND gates<br>along with an optical full adder and optical multiplexer. In this paper we aim to design<br>and propose these three basic logic gates using nonlinear photonic crystal ring resonators.<br>The simulations will be done using plane wave expansion and finite difference time<br>domain methods. The proposed structures work based on controlling the optical behavior<br>of the nonlinear resonators using optical power. The simulation results show that the<br>switching threshold for this resonant ring is about 15 mW/μm2. Reduced delay times and<br>switching optical power are the main advantages of the proposed structures. Also by adding<br>two resonant rings in input ports we reduced the cross reflection between the input<br>ports.