Investigations On Chaos Synchronization Switching And Its Characteristics

Laser chaotic system has many merits such as broad bandwidth, complex dynamic behavior and the highly sensitive to parameters, which are suitable for high-speed and long-distance communications. In the optical chaos communications, how to make the system better to maintain the fidelity and high confidentiality becomes a key issues to address in the secure communication. In this paper, chaos synchronization switching and its characteristics are investigated, and the results will helpful to achieve fidelity and confidentiality under the case of parameters mismatch.A theoretical model characterizing a reported experiment on optical chaos synchronization switching is presented. Based on the model, the correlation function has been simulated with change of detuning frequency. The results show that: changing parameters of system (such as frequency detuning), the system synchronization state will be switched between complete chaos synchronization (CCS) state and generalized chaos synchronization (GCS) state, thus presenting a chaos synchronization switching phenomenon. In the paper, the characteristics of optical chaos synchronization switching have also been numerically simulated for different feedback strength and injection strength. The results show that: for a fixed feedback strength, both on-off switching ratio and width of the chaos switching will vary with the injection strength changed; When the injection strength equals to the feedback strength, the on-off switching ratio will reach a maximum; Furthermore, when both the feedback strength and the injection strength are increased synchronously, both the on-off switching ratio and the width of the chaos switching will enhance monotonously. Investigations of this manuscript will contribute to better understanding the mechanism of chaos synchronization switching, and provide theoretical base for development of new data hiding technology.