期刊名称：Journal of Emerging Trends in Computing and Information Sciences
电子版ISSN：2079-8407
出版年度：2015
卷号：6
期号：6
页码：299-307
出版社：ARPN Publishers
摘要：The optical code division multiple access (OCDMA), the most advanced multiple access technology in communication is gaining popularity because of its asynchronous access capability, faster speed, efficiency, security and unlimited bandwidth. Many codes are developed in spectral amplitude coding optical code division multiple access (SAC-OCDMA) with minimum cross correlation property to reduce the Multiple Access Interface (MAI) and Phase Induced Intensity Noise (PIIN) noises. This paper presents a novel SAC-OCDMA code with minimum cross correlation property that lies between zero to one, to further minimize the Multiple Access Interface (MAI) referred in this work as modified random diagonal code (MRDC), which is found to be more scalable compared to the other existing SAC-OCDMA codes. In this work, the proposed MRDC code is implemented in an optical system using the optisystem software for the spectral amplitude coded optical code-division multiple-access (SAC-OCDMA) scheme. The new code family based on the MRDC code reveals properties of minimum cross-correlation, flexibility in selecting the code parameters and supports a large number of users, combined with high data rate and longer fibre length. Simulation results depict that the optical code division multiple access system based on the proposed MRDC code accommodates maximum number of simultaneous users with higher data rate transmission, lower bit error rates (BER) and longer travelling distance without any signal quality degradation, as compared to the former existing SAC-OCDMA codes.
