A novel proposal based on 2D linear resonant cavity photonic crystals for all-optical NOT, XOR and XNOR logic gates

Abstract

In this paper, we are going to propose a novel structure of all-optical NOT, XOR and XNOR logic gates are presented using a two-dimensional photonic crystal (2D-PhC). This structure is optimized by varying the radius of the cavity, to obtain a quality factor Q = 1192, and also has several ports of entry and one port of output. The size of each structure is equal to 85.8 μm2. The contrast ratios for the structures proposed all-optical NOT, XOR and XNOR logic gates between levels “0” and “1” are, respectively, 25.08, 25.03, and 14.47 dB. The response time for the three logical gates is 8.33 ps, and the bit rate is calculated at about 0.12 Tbit/s, all simulations are based on both numerical methods such as finite difference time domain (FDTD) and plane wave expansion (PWE). Designed logic gates are characterized by low power consumption, compactness and easy integration.

Performance evaluation of all-optical NOT, XOR, NOR, and XNOR logic gates based on 2D nonlinear resonant cavity photonic crystals

“…The 'Bias' port is always activated to operate our device when both the 'Input 1' and 'Input 2' ports The normalized steady-state power and the contrasts of the 0 and 1 logics for 'XNOR' gate are summarized in Table 7. According to Table 8, it can be concluded that the proposed 'XNOR' structure is characterized by a very high contrast ratio with an ultra-compact size than any previous work (Elhachemi and Rafah 2020;Rao et al 2020b;Xiao-Wen et al 2018;Moniem 2017). This feature is a very important advantage for optical devices.…”

“…The results obtained from the simulation of the 'NOT' logic gate is summarized in Table 1. Table 2 compares the functional parameters of our proposed design with previous designs (Kouddad and Naoum 2020;Elhachemi and Rafah 2020;Kordi et al 2020;Mohebbi et al 2015).…”

“…All-optical logic gates and devices are the main components of all-optical signal processing that play a very important role in modern integrated circuits (Yablonovitch 1987). As part of the efforts made to increase and optimize the speed of these circuits, the use of alloptical logic gates has been considered significant in recent decades (Dekkiche et al 2011;Kouddad and Naoum 2020;Elhachemi and Rafah 2020).…”

Efficient and Compact Optical NOR Gate based on Photonic Crystal Platform

“…The stated NOR output power was 58.4 % when turned on and 27 % at off state. Reference [24] presented an XNOR gate with a size of 85.8 μm 2 and output power of 56% at ON and 2% at OFF, with a time response of 8.33 Ps.This device also includes two optical NOR gates and two multimode-interfere structures, all of which are powered by PhC technology and have a response time of 1.2 Ps [14]. In this paper, an efficient compact optical NOR gate based on PhCs is proposed and analyzed.…”

“…The reported NOR output power of 58.4% at ON state and 27% at OFF state. Reference [24] proposed XNOR gate with dimension of 85.8 μm 2 while the output power of 56% at ON state and 2% at OFF state with time response of 8.33 Ps.…”