论文部分内容阅读
利用双光反馈垂直腔面发射半导体激光器(VCSELs)两个正交偏振模式输出的两个混沌信号作为混沌载波,构建了一个双信道的混沌保密通信系统,并对该系统的通信性能进行了数值仿真研究.研究结果表明:通过合理的选取反馈参量,双光反馈VCSELs两个偏振模式输出的混沌信号能很好地隐藏外腔反馈延时特性;双光反馈VCSEL两个偏振模式输出的混沌信号通过偏振保持注入到接收VCSEL中,在强注入锁定条件下可以实现很好的混沌同步,同步性能对频率失谐的容忍性随着注入强度的增加而加强;在附加混沌调制加密方式下,500Mbit/s的信号在传输过程中能够得到很好的隐藏,同时在接收端可以成功解调;随着通信速率的增加,Q因子呈现下降的趋势,但对于6Gbit/s的信息,Q因子仍大于6.
By using two chaotic signals from two orthogonal polarization modes of double-beam vertical-cavity surface-emitting semiconductor lasers (VCSELs) as chaos carrier, a two-channel chaotic secure communication system is constructed and the communication performance of the system is numerically Simulation results show that the chaotic signal output by the two polarization modes of double optical feedback VCSELs can well hide the feedback characteristic of the external cavity by selecting the feedback parameters reasonably. The chaotic signals of the two polarization modes of the dual optical feedback VCSEL Through the polarization maintaining injection into the receiving VCSEL, good chaotic synchronization can be achieved under strong injection locking condition, and the tolerance of synchronization performance to the frequency detuning increases with the increase of injection intensity. In the additional chaotic modulation encryption mode, 500 Mbit / s signal can be well concealed during transmission, and can be successfully demodulated at the receiving end. With the increase of the communication rate, the Q factor shows a downward trend, but for the 6 Gbit / s information, the Q factor is still larger than 6.