半导体环形激光器不可预测特性及时延信息隐藏特性研究

发布时间：2018-05-26 06:01

本文选题：半导体环形激光器 + 不可预测度　；参考：《西南交通大学》2015年硕士论文

【摘要】：随着现代化信息技术的发展,混沌保密通信系统的安全性受到了一定的威胁。一方面,由于时间序列分析方法的不断进步,使得窃听者可以成功恢复混沌载波信号的时延信息；另一方面,载波信号的不确定性也影响着系统的安全。半导体环形激光器(semiconductor ring laser, SRL)作为一种新型光源,在激光混沌通信系统中起着非常重要的作用。SRL的谐振腔可以使激光器工作在顺时针和逆时针两个方向,为增强激光混沌通信系统的安全性提供可能。本文从提高载波信号的安全性出发,定量分析了两个混沌通信系统载波信号的不可预测度和时延信息隐藏。首先,研究了基于主-从式平行注入半导体环形激光器混沌载波产生方案,借助量化工具排列熵,从对称注入和非对称注入两个角度定量分析从激光器输出信号的不可预测程度,同时分析了输出信号带宽。结果表明：从激光器输出信号的不可预测性高于主激光器,该方案可以产生优于单一SRL的载波信号；非零高失谐频率下,非对称注入有利于实现载波信号不可预测度增强,排列熵值可达到0.8；载波信号带宽主要受失谐频率影响,负失谐可以显著增强的载波信号带宽：选择适当的注入强度及负失谐频率,从激光器可以输出两路高不可预测度及带宽增强的载波信号,一定程度上提高了在混沌保密通信系统的安全性。然后,研究了基于自反馈式平行互注入半导体环形激光器(SF-PMISRLs)混沌通信方案,并与平行互注入半导体环形激光器(PMISRLs)混沌通信系统进行对比。针对对称和非对称两种注入方式,利用自相关函数的峰／谷最大值定量分析混沌强度时间序列的时延标记,借助量化工具排列熵分析混沌强度时间序列的不可预测度特性。结果表明：SF-PMISRLs系统与PMISRLs系统相比,前者满足时延隐藏的参数区域随失谐频率的增大而拓宽,后者对应的参数区域范围较窄,说明SF-PMISRLs系统可以使时延信息有效隐藏,特别地,在高失谐频率下选择非对称注入使得该系统时延信息隐藏效果最佳；SF-PMISRLs系统和PMISRLs系统相比,二者实现；不可预测性增强的参数区域基本相同,选择高失谐频率和适当注入强度大小可以有效提高SRL输出信号的不可预测度。
[Abstract]:With the development of modern information technology, the security of chaotic secure communication system is threatened. On the one hand, due to the development of time series analysis methods, eavesdroppers can successfully recover the delay information of chaotic carrier signals; on the other hand, the uncertainty of carrier signals also affects the security of the system. As a new type of light source, semiconductor ring laser, SRL) plays a very important role in laser chaotic communication system. The resonator of semiconductor ring laser can make the laser work in both clockwise and counterclockwise directions. It is possible to enhance the security of laser chaotic communication system. In order to improve the security of carrier signals, the unpredictability and delay information hiding of carrier signals in two chaotic communication systems are quantitatively analyzed in this paper. Firstly, chaotic carrier generation scheme based on master-slave parallel injection semiconductor ring laser is studied, and entropy is arranged by quantization tool. The unpredictable degree of output signal of laser is quantitatively analyzed from two angles of symmetric injection and asymmetric injection, and the bandwidth of output signal is analyzed at the same time. The results show that the unpredictability of the output signal from the laser is higher than that of the main laser, and the scheme can produce a carrier signal better than the single SRL, and the asymmetric injection can enhance the unpredictability of the carrier signal at the non-zero high detuning frequency. The carrier signal bandwidth is mainly affected by detuning frequency, and the carrier signal bandwidth which can be significantly enhanced by negative detuning can be selected with proper injection intensity and negative detuning frequency. Two carrier signals with high unpredictability and bandwidth enhancement can be output from the laser, which improves the security of chaotic secure communication system to a certain extent. Then, the chaotic communication scheme based on self-feedback parallel mutual injection semiconductor ring laser (SF-PMISRLs) is studied and compared with the parallel mutual injection semiconductor ring laser (PMISRLs) chaotic communication system. For symmetric and asymmetric injection modes, the time-delay markers of chaotic intensity time series are quantitatively analyzed by using the peak / valley maximum of autocorrelation function, and the unpredictable degree characteristics of chaotic intensity time series are analyzed by means of quantization tool permutation entropy. The results show that compared with PMISRLs system, the parameter region of the former can be widened with the increase of detuning frequency, and the parameter range of the latter is narrower, which indicates that the delay information can be effectively hidden by the SF-PMISRLs system, especially when the detuning frequency increases. Under the condition of high detuning frequency, the asymmetric injection makes the delay information hiding effect of the system best compared with that of PMISRLs system, and the unpredictability enhancement parameter region is basically the same. The unpredictability of SRL output signal can be improved by choosing high detuning frequency and proper injection intensity.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248.4

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