Abstract
Abstract
In this paper, we investigate the impact of modulation index on the performances of SCM SAC-OCDMA system. Knowing that zero cross-correlation (ZCC) codes remove the effect of multiple access interference and of phase-induced intensity noise, SCM SAC-OCDM has been investigated using ZCC codes with two types of direct detection, one and all wavelengths of the code. In this hybrid system, the SNR depends on the modulation index for a given effective power of broadband source. In order to maximize the SNR, the optimum values of the modulation index, for different number of subcarriers, are determined analytically for two types of detection. The performance of the optimized system is evaluated based up on BER. The obtained numerical results show that, by optimizing the modulation index, the number of subcarriers (number of active users per ZCC code) is increased and the performance is significantly improved.
Subject
Electrical and Electronic Engineering,Condensed Matter Physics,Atomic and Molecular Physics, and Optics
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