2-D extended EDW : the new scheme of two dimensional wavelength-time coding for optical code division multiple access system

In recent years, there has been growing research interest in Optical Code Division Multiple Access (OCDMA) system especially in term of two dimensional (2-D) OCDMA coding. This is due to its ability to serve as an integrated broadband service that enables instant accesses to huge web of information with high reliability transmission system. However, with the enormous contributions, there are still limited solution for 2-D OCDMA coding. This work is aimed at presenting a new formulation of 2-D wavelengthtime code for Spectral Amplitude Code (SAC) OCDMA system which has been referred as 2-D Extended EDW. This 2-D code has been based from one-dimensional Enhanced Double Weight (1-D EDW). The system is designed to effectively increase simultaneous users and reduce noise with lower Bit Error Rate (BER) value to attain lower transmitted effective power consumption. This research work involved three main phases, that are designing of the code, extensive numerical analysis and implementation of the code in simulation environment. In designing the code, a good property of cross-correlation is formulated, which has resulted in effective Phase Induced Intensity noise (PIIN) and multiple access interference (MAl) suppression. The outcomes of the extensive numerical analysis have shown that 2-D Extended EDW code had significantly gained a better performance in terms of BER and cardinality when compared with 1-D ED W code and other 2-D codes, such as 2-D M Matrices and 2-D MQC. The achievement of the cardinality (maximum users under BER= 10-9) is about 200% and 36%, has been recorded in comparison with 1-D EDW and 2-D MQC respectively. Furthermore, the 2- D Extended EDW code also consumes lower power effectiveness for the system when compared with others 2-D codes, which is -19 dBm. In evaluating its performance in the simulation environment by using Optisys software system, the results revealed that the data can be transmitted efficiently in the optical network.