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基于两个在驱动混沌信号注入下的响应半导体激光器之间的混沌同步,提出了一种新型的可实现信息双向、长距离保密传输的系统,并建立了相应的理论模型.利用该理论模型,研究了系统的双向传输性能、安全性能以及系统性能随传输距离的变化.结果表明:两个响应激光器在受到发自同一驱动混沌激光器的混沌光注入下,其混沌输出虽然与注入混沌信号相差很大,但两个响应激光器的混沌输出却能实现非常好的无时间延迟的等时同步;对窃听者可能获取信息的各个途径进行了考察,结果显示该系统具有很好的安全性;采用普通单模光纤作为传输信道,信息经过50 km传输后,解调信息Q因子可达到6以上;采用色散位移光纤,信息经过200 km的传输,解调信息Q因子还可达6以上.
Based on the two chaotic synchronization between two semiconductor lasers driven by chaotic signal driving, a new type of system that can realize information bi-directional and long-distance secure transmission is established and a corresponding theoretical model is established.Using this theoretical model, The two-way transmission performance, safety performance and the change of system performance with the transmission distance are studied. The results show that the chaotic output of the two response lasers is very different from the chaotic signal injected by the same driving chaotic laser But the chaotic output of the two response lasers can achieve very good isochronous synchronization without time delay. The various ways that the eavesdropper may obtain the information are investigated, and the results show that the system has good security. The common Single-mode optical fiber as the transmission channel, the information after 50 km transmission, demodulation information Q factor can reach more than 6; the use of dispersion-shifted fiber, the information after 200 km transmission, demodulation information Q factor up to 6 or more.