Quality of Service Improvement of 2D-OCDMA Network Based on Two Half of ZCC Code Matrix

Abstract

In this paper, a novel code construction of two dimensional spectral/spatial code based on halve matrices code named two dimensional-Half Spectral/Spatial zero cross correlation (2D-HSSZCC) code, is developed to be implemented in a non-coherent Spectral Amplitude Coding Optical Code Division Multiple Access (SAC-OCDMA) systems. The proposed 2D-HSSZCC code is characterized by a high capacity and a zero cross correlation property that completely remove the influence of multiple access interference (MAI), which is considered the main drawback of the OCDMA system. According to numerical results, they indicate that the SAC-OCDMA system has been improved with our proposed code whatever capacity, data rate and optical bandwidth terms. As a result, the proposed 2D-HSSZCC code is able to save the optical bandwidth around 2.4 and 6 THz comparing to 2D-Dynamic Cyclic Shift (2D-DCS) and 2D-Perfect Difference (2D-PD) codes, respectively. In addition, it can increase the cardinality percentage up to 63.2%, 70.8% and 19.4% comparing to one dimensional-ZCC (1D-ZCC), 2D-PD and 2D-DCS codes, respectively. Moreover, data rate has been tested in SAC-OCDMA systems where the greatest share belonged to 2D-HSSZCC code. On the other hand, the system performance has been studied using Optisystem software where the simulation result shows that the proposed code produces a low bit error rate (BER) and a high Q-factor of closely 1.8e-16 and 8.1 dB for four users with a low power source of −115 dBm.