Cardinality enhancement utilizing Sequential Algorithm (SeQ) code in OCDMA system C. A. S. Fazlina, C. B. M. Rashidi, A. K. Rahman and S. A. Aljunid EPJ Web Conf., 162 (2017) 01022 Published online: 22 November 2017 DOI: 10.1051/epjconf/201716201022