论文部分内容阅读
提出了一种基于数字混沌与偏振移位键控(PolSK)技术的光保密通信系统。该系统选取几种偏振态部分或完全相同的PolSK方式,在系统不同时钟周期,发送端根据实时产生的数字混沌序列选用不同的PolSK方式调制信息,接收端利用同步的混沌序列与相应的PolSK方式解调信息。数字混沌序列的伪随机特性使得该系统的PolSK调制方式呈现无规则变化。当星座点个数不少于6且选用的PolSK方式不少于4种时,可选的PolSK组合超过1060种,系统的密钥空间庞大。用OptiSystem和Matlab软件相结合的方法进行了系统仿真,并做了一定的数值分析。仿真与分析结果表明,该光通信系统通信正常,具有较强的保密性。
An optical confidential communication system based on Digital Chaos and Polarization Shift Keying (PolSK) technology is proposed. The system chooses several kinds of polarization states or the same PolSK method. At different system clock cycles, the sender selects different PolSK modulation information according to the real-time digital chaotic sequence. The receiver uses the synchronized chaotic sequence and the corresponding PolSK method Demodulate information The pseudo-random nature of the digital chaotic sequence makes the PolSK modulation of the system show irregular changes. When the number of constellation points is not less than 6 and the number of selected PolSK modes is not less than 4, the optional PolSK combination exceeds 1060, and the system has a large key space. The system simulation was carried out by combining the OptiSystem and Matlab software, and a certain numerical analysis was done. Simulation and analysis show that the optical communication system has normal communication and strong confidentiality.