Simulative performance of optical CDMA network with subcarrier multiplexing technique using zero cross correlation code

This paper demonstrates the transmission performance of a subcarrier multiplexing over optical CDMA for a simple point-to-point network design. This integrated system is expected to improve the spectral efficiency and the channel data rate of the OCDMA network. The simulation is done using Optisys version 7.0. Spectral amplitude coding (SAC)-OCDMA is employed in this study because of its ability to suppress the Multiple Access Interference (MAI) using code sequences with fixed in-phase cross correlation. This system utilizes the zero cross correlation (ZCC) code. 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. It has been observed from the simulation results that up to eight RF channels can be added up in one optical channel for a successful transmission of 45km. It is also shown that higher subcarrier frequencies contribute to a better BER performance. This new hybrid system is proven to provide better spectral efficiency by accommodating larger number of simultaneous users with fewer optical channels, hence lowering the implementation cost. Thus, this system could be one promising solution to the symmetric high-capacity access network with high spectral efficiency, cost effective, good flexibility and enhanced security, which makes an attractive candidate for next-generation broadband access network.