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在混沌通信系统中,混沌载波的时延特征直接影响着通信系统的安全性,因此隐藏混沌载波的时延特征信息十分重要。本文基于外腔反馈式半导体激光器(ECSL)的单光注入结构,引入激光器参数失配,详细阐述了一种通过主从激光器参数失配来消除混沌信号时延特征的方法。利用自相关函数作为量化工具,对混沌信号的时延隐藏效果进行量化分析,数值研究了主从激光器间的参数失配对混沌信号时延消除的影响,并结合注入强度与频率失谐开展了进一步综合研究。研究结果表明:引入激光器参数失配对时延隐藏的效果影响显著,参数失配率在-0.4~0范围时有助于在从激光器混沌输出中隐藏主激光器外腔引入的反馈时延;而且,当主激光器注入强度在10ns-1~20ns-1范围内,主从激光器频率失谐控制在-20GHz附近时,信号时延隐藏效果最佳。因此,由此单混沌光注入系统产生的混沌信号可显著提高混沌载波的安全性,进而增强其潜在应用的性能。
In the chaotic communication system, the chaotic carrier’s delay characteristic directly affects the security of the communication system, so it is very important to hide the chaotic carrier’s delay characteristic information. Based on the single-light-in structure of an external cavity feedback semiconductor laser (ECSL), the laser parametric mismatch is introduced in this paper. A method to eliminate the chaotic signal delay characteristics by mismatching the parameters of the master-slave laser is described in detail. The autocorrelation function is used as a quantitative tool to quantify and analyze the time delay concealment effect of chaotic signals. The effect of parameter mismatch between master and slave lasers on the elimination of chaos signal delay is numerically studied. Combining the injection intensity and frequency detuning, Comprehensive Study. The results show that the introduction of laser parameters mismatch has a significant effect on the time delay concealment. When the parameter mismatch rate is in the range of -0.4 ~ 0, it helps to hide the feedback delay introduced by the external cavity of the main laser from the laser chaotic output. Moreover, When the main laser injection intensity in the range of 10ns-1 ~ 20ns-1, the master-slave laser frequency detuning control in the vicinity of -20GHz, the signal delay hiding the best. Therefore, the chaotic signal generated by the single chaos light injection system can significantly improve the security of the chaotic carrier and further enhance its potential application performance.