Abstract.A hybrid subcarrier multiplexing (SCM) technique incorporating spectral amplitude coding and optical code division multiple access (SAC-OCDMA) technologies is investigated using both numerical and simulation methods. The hybrid SCM/SAC-OCDMA system combines the two above schemes in such a way that it is robust to multiple access interference and reveals much enhanced channel data rate. We improve the overall performance of the hybrid SCM/SAC-OCDMA system based on spectral amplitude coding to suppress a number of impairments and improve its sensitivity at a bit error rate of 10 -9 . As a result, the system suggested by us, which is based on a dynamic cyclic shift code, shows better performance when compared with the standard SAC-OCDMA systems employing the conventional code.Keywords: dynamic cyclic shift code, spectral amplitude coding -optical code division multiple access systems, phase induced intensity noise, modified quadratic congruence code, random diagonal code.

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Abstract. In this paper we have modelled and simulated a 1.6 Tb/s (100×16 Gb/s) optical system based on spectral amplitude coding for the optical code-division multiple-access (SAC-OCDMA) scheme. In order to reduce the effect of multiple-access interference, we have employed a new family of SAC-OCDMA codes called as a multi-diagonal (MD) code. The new code family based on the MD code reveals properties of zero cross-correlation code, flexibility in selecting the code parameters and support of a large number of users, combined with high data rate. Both the numerical and simulation results have demonstrated that our optical system based on the MD code can accommodate maximum numbers of simultaneous users with higher data rate transmission and lower bit error rates, when compared to the former SAC-OCDMA codes.Keywords: spectral amplitude coding for the optical code-division multiple-access (SAC-OCDMA), multi-diagonal (MD) code, high data rate optical systems, random diagonal (RD) code, modified quadratic congruence (MQC) code.

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