Development of a new code family based on SAC-OCDMA system with large cardinality for OCDMA network

• Published in: Optical fiber technology 2011-07, Vol.17 (4), p.273-280
• Main Authors: Abd, Thanaa Hussein, Aljunid, S.A., Fadhil, Hilal Adnan, Ahmad, R.A., Saad, N.M.
• Format: Article
• Language: English
• Subjects: Modified Quadratic Congruence (MQC) code and Random Diagonal (RD) code; Multi-Diagonal (MD) code; Spectral Amplitude – Coding Optical Code Division Multiple Access (SAC-OCDMA)
• ISSN: 1068-5200; 1095-9912
• DOI: 10.1016/j.yofte.2011.04.002

► To develop a new SAC-OCDMA code (Multi diagonal (MD) code) based on zero cross correlation property. ► To develop a mathematical model for OCDMA based on the proposed code. ► To analysis the proposed code parameters such as code length, code weight, and number of users. ► To investigate the performance of OCDMA system under various system parameters such as the number of users, bit error rate (BER), eye diagrams, and signal to noise ratio (SNR). ► To compare the performance of the proposed code over other SAC-OCDMA codes. We have proposed a new Multi-Diagonal (MD) code for Spectral Amplitude – Coding Optical Code Division Multiple Access (SAC-OCDMA). Although this new MD code has many properties, one of the important properties of this code is that the cross correlation is always zero. Simplicity in code construction and flexibility in cross correlation control has made this code a compelling candidate for future OCDMA applications. The Multiple access interference (MAI) effects have been successfully and completely eliminated. Based on the theoretical analysis MD code is shown here to provide a much better performance compared to Modified Quadratic Congruence (MQC) code and Random Diagonal (RD) code. Proof-of-principle simulations of encoding with 5 and 10 users with 622 Mb/s data transmission at a BER of 10 −12 have been successfully demonstrated together with the DIRECT detection scheme.