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中文摘要：
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．
英文摘要：
Using two orthogonal polarization mode outputs from a vertical-cavity surface emitting lasers （VCSEL） with double optical feedback as two chaotic carriers, a dual-channel chaos secure communication system is established, and the synchronization and communication performances of such a system are numerically investigated. The results show that under suitable operated condition, the time-delay signatures of two chaotic carriers originating from two linear polarization modes in the T-VCSLE with double optical feedback can be suppressed efficiently. Under the strong injection locking case, high-quality chaos synchronization between two corre- sponding modes of T-VCSEL and R-VCSEL can be realized by polarization-preserved optical injection from T-VCSEL to R-VCSEL. Moreover, the tolerance of the synchronization quality on the frequency detuning between T-VCSEL and R-VCSEL is enhanced with the increase of the injection strength. Adopting additive chaos modulation encryption scheme, two pieces of 500 Mbit/s encoded message can be hidden efficiently in the two chaotic carriers in the propagation process and can be successfully extracted at the receiver. Although Q factor decreases with the increase of message transmission rate, the values of Q factor for two channels are still larger than 6 for 6 Gbit/s message.
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