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提出外部光注入半导体激光器激光混沌全光耦合-反馈同步系统,进行激光器系统稳定性动力学分析并计算出最大Lyapunov指数,导出系统的同步误差扰动方程以及系统有混沌隐藏编码时的同步误差公式和解调公式,数值证明并模拟实现了系统的混沌同步,分析同步瞬态响应和噪声影响,该系统具有较强的抗干扰能力。模拟具有正弦调制信号的调制频率0.2 GHz混沌模拟通信和数字信号调制速率0.2 Gb/s的混沌数字通信以及调制速率0.05 Gb/s混沌键控通信的应用,特别分析了系统解码特性和调制带宽,系统无论是在时域还是在频域,都具有非常好的保密性,该系统可以作为混沌双向保密通信使用。研究表明系统准许在一定范围内可以有参数失配,系统的实际应用是有可能的。
An external light injection laser diode laser chaotic all-optical coupling-feedback synchronization system is proposed. The laser system stability dynamics analysis is performed and the maximum Lyapunov exponent is calculated. The synchronization error disturbance equation of the system and the synchronization error formula when the system has the chaotic concealment code Demodulation formula, numerical proof and simulation of the system to achieve the synchronization of chaos, analysis of simultaneous transient response and noise effects, the system has strong anti-interference ability. Simulation of chaotic digital communication with modulation frequency of 0.2 GHz with modulation frequency of 0.2 GHz and chaotic digital communication with modulation rate of 0.2 Gb / s and application of chaos key modulation with modulation rate of 0.05 Gb / s. The system decoding characteristics and modulation bandwidth are analyzed in detail. The system has very good confidentiality whether it is in the time domain or the frequency domain. The system can be used as chaos bidirectional secure communication. Research shows that the system allows parameter mismatch within a certain range, and the practical application of the system is possible.