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注入锁定式光混沌同步通信系统对收发机的参数失配有较大的容忍度,这在一定程度上降低了信息的安全性.提出采用反馈强度的调制来提高系统的保密性.数值模拟分析了调制前后系统提取信号质量的变化,以及收发机调制的速率失谐、延时对提取信号质量的影响.研究发现:仅在发射机增加反馈强度调制后,同步性恶化、误码率增大两个数量级,无法提取信号;而在接收机引入相同的调制后,系统同步性及误码率得到恢复.此外,收发机的反馈强度调制速率失谐和延时范围分别在±5MHz和±0.1倍调制周期时,信息提取质量较高.反馈强度调制能够有效地增强传统混沌通信系统的保密性.
The injected lock-in optical chaos synchronization communication system has greater tolerance to the parameter mismatch of the transceiver, which reduces the information security to a certain extent. The feedback strength modulation is proposed to improve the system confidentiality. Numerical simulation analysis The quality of the extracted signal before and after the modulation is changed, and the rate mismatch and delay of the transceiver modulate the quality of the extracted signal.It is found that after the transmitter increases the feedback intensity modulation, the synchronization is worsened and the bit error rate is increased Two orders of magnitude, unable to extract the signal; and in the receiver after introducing the same modulation, the system synchronization and error rate is restored.In addition, the transceiver feedback strength modulation rate detuning and delay range of ± 5MHz and ± 0.1 When the modulation period is doubled, the quality of information extraction is high. Feedback intensity modulation can effectively enhance the confidentiality of traditional chaotic communication system.