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In this paper, the performance of a hybrid scheme of Subcarrier Multiplexing (SCM) technique in a Spectral Amplitude Coding (SAC) Optical Code Division Multiple Access (CDMA) transmissions system is evalu ated. The hybrid system is design using new code family; we call it Dynamic Cyclic Shift (DCS) code. The DCS code design for SACOCDMA system to reduce the effect of Multi Access Interference due to it property of low cross correlation (λ C ≤ 1) between code words. In contrast, the SCM scheme shows the ability to increase the data rate of SACOCDMA system. Consequently, the hybrid SCM/SAC OCDMA system could be one promising solution to the high capacity access network with low cost effective, good flexi bility and enhanced security, which makes an attractive candidate for nextgeneration broadband access network.

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Hybrid Subcarrier Multiplexing (SCM) incorporating spectral amplitude coding optical code division multiple access (SAC-OCDMA) technology was investigated both mathematically and by simulation. The hybrid SCM/SAC-OCDMA system combined two schemes in such as a way that the resulting hybrid system is robust against the Multi-Access Interference (MAI) and much enhanced the channel data rate. In this paper, we describe the improved performance of the hybrid SCM/SAC-OCDMA system based on the use of spectral amplitude coding to suppress impairments and to improve the overall system improve the overall sensitivity of system performance at a BER of 10-9. As a result, the proposed system based on Multi-Diagonal (MD) code shows better performance in comparison to the conventional code that employs the SAC-OCDMA system. We also evaluate the different design parameters under the maximum number of subcarriers (18 subcarriers in each optical channel) multiplexed for integrating OCDMA technology onto the existing fiber-wireless infrastructure at 155 M bit/s data rate for different fiber lengths. Further, a BER of 4.4 × 10-10 was achieved based on the proposed system for 45 km at 1.21 GHz.