Optimization of Chaotic Output Synchronization for Unidirectional Coupled Semiconductor Laser Systems
The synchronous chaotic light output of semiconductor laser system has important research significance and appli-cation value in the field of secure optical communication.In a unidirectional coupled chaotic synchronization system,the output of chaotic laser by a driving semiconductor laser and a responding semiconductor laser with external cavity optical feedback and the output of chaotic light by these two semiconductor lasers are numerically analyzed.Firstly,the parameters of external cavity optical feedback semiconductor laser are globally optimized by multi-objective genetic algorithm.The optimized parameters for the simultaneous enhancement of bandwidth,security and complexity of chaotic light output by a single semiconductor laser are obtained.Aiming at the different optimized chaotic light,the injection intensity and frequency mismatch in the unidirectional coupled semiconductor laser system are further searched globally,and the correlation number of chaotic laser output between the two lasers is finally obtained.The influence of the closed-loop structure response to the external cavity optical feedback structure of the laser on the chaotic synchronization degree is investigated.Finally,the two lasers can output chaotic lasers with no delay characteristics and wide bandwidth and good complexity.Generalized synchro-nization with the number of cross-relations up to 0.995 can be realized.
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