Combined modulation and code design approach for MAI canelation in OCDMA system

Optical code division multiple access (OCDMA) is a promising technology for optical networks especially for optical signal multiplexing as it offers huge bandwidth, secure transmission and high speed. The OCDMA system performance is limited by multiple access interference (MAI) due to asynchronous nature of transmission. This paper discuss an MAI cancellation technique for OCDMA system by incorporating M-ary-FSK Modulation and also by employing double padded modified prime code as a signature sequence. The FSK-OCDMA system performance is compared with the existing pulse position modulation (PPM)-OCDMA system. The results reveal that the FSK-OCDMA system achieve better MAI cancellation by providing lower bit error rate than the PPM-OCDMA system.