Performance evaluation of SAC-OCDMA using direct detection techniques

Abstract

In optical code division multiple access (OCDMA), noise give a big effect in degrading the performance of the system. Theoretically, direct detection technique can successfully suppressed or eliminate the dominant noise such as multiple access interference (MAI) and phase induced intensity noise (PIIN). This paper presents the performance’s comparison of the Modified Double Weight (MDW) code, Enhanced Double Weight (EDW) code, Zero Cross Correlation (ZCC) code and Random Diagonal (RD) code using direct detection. The MDW and EDW codes are the modification of the double weight (DW) code which has the variable code weight that greater than DW code. The MDW code has an even code weight which is greater than two while the EDW code has the odd code weight which is greater than three. The ZCC code is a code that is built using the concept of “non-overlapping of bit 1” in a codeword among users which can suppress phase induced intensity noise (PIIN) and also prevent the interference between users. RD code is constructed using code segment and data segment. One of the important properties of this code is that the cross correlation at data segment is always zero, which means that PIIN is reduced.