Security-Enhanced Electro-Optic Feedback Phase Chaotic System Based on Nonlinear Coupling of Two Delayed Interfering Branches

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Abstract
In this paper, a novel electro-optic feedback phase chaotic system based on nonlinear coupling of two delayed interfering branches is proposed and analyzed by numerical simulation. The feedback loop of proposed system contains two delay branches and a Mach-Zehnder modulator (MZM). The chaotic voltages generated from two branches are nonlinearly converted in order to reduce the temporal correlations. The dynamic characteristics and the complexity of generated chaotic signal are evaluated by the bifurcation diagram and permutation entropy. Besides, the simulated results show that the time-delay signature can be concealed effectively with a lower feedback gain, meanwhile the key space is extended considerably since more tunable parameters are nonlinearly coupled, thus the security can be improved greatly. Furthermore, the communication system based on proposed scheme is discussed, and the results demonstrate that this system can be applied in secure communication.
Funding Information
  • National Natural Science Foundation of China (61771073)
  • Funds of Beijing Advanced Innovation Center for Future Internet Technology of Beijing University of Technology, China

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