| In recent years, with the development of high speed and large capacity all-optical network, the chaos-based secure optical communication has become a new research hot spot. Chaos synchronization is the foundation and premise of realization of chaos-based secure communication. The existing chaos-based secure optical communication researches are based on the system parameters of transmitter and receiver are identical or there are only small mismatch on the premise. However, in the optical communication network, all system parameters of each node for communication or key distribution are almost the same is not possible. In addition, unidirectional chaos synchronization obviouy does not meet the actual communication requirements. Therefore, it is very important to study the chaos synchronization of optoelectronic oscillators with a part of different parameters, bidirectional chaos-based secure optical communication and chaos synchronization of a star optical network based on optoelectronic oscillators.Chaos synchronization of optoelectronic oscillators with a part of different parameters is discussed in this thesis. According to the stability theorem, we give a sufficient condition for realizing stable zero-lag chaos synchronization. We also design two different simple and realizable synchronization control functions which meeting the sufficient condition. At last, chaos synchronization of optoelectronic oscillators with a part of different system parameters is numerically investigated. The results show that the synchronization control functions can greatly improve the synchronization performance of such sender-receiver set-up. Numerical results are in excellent consistent with theoretical results.The bidirectional chaos-based secure optical communication of optoelectronic oscillators is discussed in this thesis. The synchronization performance, safety performance and communication performance of the system are numerically analyzed. Research results show that in the case of other parameters matching, the mismatches between delay time, information signal power, laser power or phase will not significantly reduce the synchronization performance of the bidirectional communication system. The synchronization performance is more sensitive to gain coefficient mismatch, with the increasement of the gain coefficient mismatch, chaos synchronization quality decreased linearly.Finally, chaos synchronization of a star network based on optoelectronic oscillators is discussed in this thesis. The general mathematical model of chaos-based secure optical communication network based on optoelectronic oscillators is described and the form of the network coupling function of each node is given. Finally, chaos synchronization of the star network with 50 nodes is numerical investigated through cross correlation function. The results show that stable zero-lag chaos synchronization can be achieved of the star network based on optoelectronic oscillators. |
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