| Recently, chaos synchronization has attracted much attention for its potential applications in secure communications in which a chaotic signal is utilized as an information carrier. Semiconductor laser (SL), which can generate large band-with and hyper-dimension chaos signal through feedback and injection, has been enthusiastically studied. And various schemes based on the semiconductor lasers have been proposed and investigated for chaotic transmission.At present, researches on chaos of semiconductor lasers and chaos synchronization are generally based on Lang-Kabayashi rate equation. But in most researches, constant carrier life approximation method (CCLA) is often adopted. For semiconductor lasers working above threshold the approximation is applicable, but for chaotic conditions the method is not appropriate. Therefore, after considering the actually recombination mechanism of the carrier in the SL, the characteristics of the semiconductor optical chaotic system have been investigated numerically, and the obtained results have been compared with those obtained with CCLA. It has been shown that CCLA will not only result in the wrong definition of the chaotic region but also influence the analysis on the relation of the master-slave synchronization error with parameter mismatching.Based on the above analysis, the influence of optical feedback on the complete synchronization of the external-feedback SL has been investigated in this paper. The results show that, during the variations of the feedback coefficient, the complete...
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