Simulative performance of hybrid recursive combinatorial OCDMA subcarrier multiplexed technique based on single photodiode detection

Abstract

This paper presents the simulative performance of optical CDMA system incorporated with subcarrier multiplexing (SCM) technique. The system is designed based on the Recursive Combinatorial (RC) code in the Spectral amplitude coding (SAC) - OCDMA. SAC-OCDMA approaches is capable to reduce the effect of Multiple Access Interference (MAI) using code sequences with fixed in-phase cross correlation. The performance of this hybrid system is shown through simulative experiment results of bit error rate (BER) and eye patterns for various numbers of subcarrier channels and frequencies. The simulation is done using Optisys version 7.0. The simulation results shows decreasing the number of weight will produce better performance compared to increasing the number of weight. Increasing the number of weight will increase the spectral chips and makes the system more sensitive to the noise. For the weight = 3, the transmission distance is up to 9.5 km.