可变偏振滤波光反馈下VCSELs输出混沌的延时特征研究

发布时间：2018-01-02 09:35

本文关键词：可变偏振滤波光反馈下VCSELs输出混沌的延时特征研究　出处：《西南大学》2016年硕士论文　论文类型：学位论文

【摘要】：随着信息技术的快速发展,日常生活中信息的安全问题变得越来越受关注。光纤通信作为当前的主流传输方式之一,显然基于光纤通信的保密研究显得尤为重要。由于半导体激光器(SLs)输出的混沌信号能够很好的应用于光纤保密通信、混沌雷达和光逻辑门等领域,从而受到了广大科研工作者的关注。一般而言,用于使SLs输出混沌信号的方法主要有光电反馈、光注入、光反馈等。光反馈由于其具有能够较容易产生高维复杂混沌信号,一直作为SLs产生混沌信号的首选方案之一。通常,利用光反馈获得的混沌信号具有明显的时间延迟特征(TDS)。通过适当的数学算法,窃密者可以确定保密通信系统的混沌延迟时间,给保密通信系统的安全性带来重大威胁。垂直腔表面发射激光器(VCSELs)相比于传统的边发射激光器(EELs)具有一系列天然优势,且VCSELs能够同时输出两个相互垂直的偏振分量,这十分有利于实现双通道混沌保密通信。在此非常有必要寻找一种VCSELs混沌输出TDS抑制的系统方案。本文提出了在VCSELs中引入可变偏振滤波光反馈(VPFOF)实现输出混沌信号TDS抑制的系统方案。利用自旋反转模型(SFM)、自相关函数(SF)和排列熵算法(PE)对VPFOF-VCSEL系统混沌输出的TDS进行计算。结果表明:在固定其它反馈参数的情况下,通过分别改变VPFOF-VCSEL系统的反馈强度和可变偏振角度,得出VPFOF-VCSEL系统中的反馈强度和可变偏振角度对其输出混沌信号的TDS有很大影响,且在选择适当的反馈强度、可变偏振角度和滤波器半高半宽,VPFOF-VCSEL系统可以实现X偏振分量(X-PC)和Y偏振分量(Y-PC)的TDS同时抑制。接下来,通过分别模拟计算反馈强度和可变偏振角度以及反馈强度和滤波器半高半宽的空间演化图,得到了VPFOF-VCSEL系统输出X-PC和Y-PC的TDS同时抑制的区域。最后,将VPFOF-VCSEL混沌系统分别与可变偏振镜子光反馈(VPMOF)VCSEL混沌系统和偏振保持滤波光反馈(PPFOF)VCSEL混沌系统进行对比分析,在优化参数下,VPFOF-VCSEL系统能够更加容易实现X-PC和Y-PC的TDS同时抑制。
[Abstract]:With the rapid development of information technology, information security issues in daily life become more and more attention. As one of the main optical fiber communication transmission current, apparently based on secret research on optical fiber communication is very important. Because of the semiconductor laser (SLs) chaotic signal in optical fiber communication can very good application output, and radar optical logic gate field of chaos, thus by the majority of the attention of scientists. In general, the SLs output method for chaotic signals are mainly optoelectronic feedback and optical injection, optical feedback. By optical feedback which can easily generate complex high-dimensional chaotic signal, has been as one of the first scheme for SLs generating chaotic signal. Usually, with obvious time delay characteristics of chaotic signals obtained with optical feedback (TDS). By mathematic algorithm, QieMi can determine the secure communication system Time delay chaotic system, pose a major threat to the security of secure communication system. The vertical cavity surface emitting laser (VCSELs) compared with the traditional edge emitting laser (EELs) has a series of natural advantages, and VCSELs can simultaneously output two mutually perpendicular polarization, which is conducive to the realization of dual channel chaos this communication is very necessary to find out a VCSELs chaotic output TDS suppression system scheme is put forward in this paper. The introduction of variable polarization filter in VCSELs optical feedback (VPFOF) scheme of TDS output chaotic signal suppression. The spin flip model (SFM), autocorrelation function (SF) and permutation entropy (PE) the chaotic output VPFOF-VCSEL system TDS were calculated. The results show that under the fixed other feedback parameters, the feedback intensity and variable polarization angle change VPFOF-VCSEL system, the VPFOF- Has a great influence on the feedback strength and variable polarization angle in VCSEL system on the output of chaotic signal TDS, and in the selection of appropriate feedback intensity, polarization angle and variable filter half half width, VPFOF-VCSEL system can realize X polarization (X-PC) and Y (Y-PC) TDS polarization component and suppression. Next, evolution through the simulation of feedback intensity and variable polarization angle and feedback intensity and half width of the filter half space, the output of the VPFOF-VCSEL system and X-PC Y-PC TDS also inhibited the area. Finally, the VPFOF-VCSEL chaotic system with variable polarization mirror optical feedback (VPMOF) VCSEL chaotic system and the polarization maintaining optical feedback filter (PPFOF) comparative analysis of VCSEL chaotic system under optimized parameters, VPFOF-VCSEL system can more easily achieve X-PC and Y-PC TDS also suppressed.

【学位授予单位】：西南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN248

【相似文献】