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把量子阱激光混沌耦合反馈同步系统应用于光纤保密通信中,提出光纤混沌双芯双向保密通信设想.通过耦合外部光注入多量子阱激光混沌全光耦合反馈同步系统和光纤传输信道,建立了光纤混沌双芯双向通信系统物理模型.理论和数值证明了激光混沌同步,理论分析指出光纤中的自相位调制是限制激光混沌在光纤传输中同步的主要原因,并推导出混沌信号双芯双向传输中的非线性相移以及混沌激光功率限制和传输距离公式.数值实现了该系统在长距离二根光纤传输中的同步,详细地分析了系统同步时间随光纤传输长度的关系.模拟了调制频率0.6GHz的混沌模拟通信和调制速率0.6Gbit/s的混沌数字通信以及调制速率0.05Gbit/s的混沌键控编码在光纤保密通信中的应用,计算出光纤混沌数字通信速率和同步误差的关系,还特别分析了系统解码特性和调制带宽.表明系统确有非常好的保密性能,光纤混沌双芯双向保密通信是可以实现的.
The quantum chaos laser chaos coupling feedback synchronization system is applied in optical fiber secure communication, and the conception of double-core optical fiber chaos bi-directional two-way secure communication is put forward. By coupling external light into multi-quantum well laser chaotic full optical coupling feedback synchronous system and optical fiber transmission channel, Chaos two-core two-way communication system physical model.The chaos synchronization of laser is proved theoretically and numerically, the theoretical analysis indicates that the self-phase modulation in optical fiber is the main reason to limit the synchronization of laser chaos in optical fiber transmission, The nonlinear phase shift and the power limitation and transmission distance formula of chaotic laser are obtained.Numerical results show that the system synchronizes with two optical fibers in long distance and the relationship between system synchronization time and optical fiber transmission length is analyzed in detail.The modulation frequency 0.6 GHz chaos simulation communication and the modulation rate of 0.6Gbit / s chaotic digital communication and the modulation rate of 0.05Gbit / s chaos-key coding in the optical fiber secure communication applications to calculate the optical fiber chaos digital communication rate and synchronization error, but also Special analysis of the system decoding characteristics and modulation bandwidth shows that the system does not Very good confidentiality, optical fiber chaos two-way bi-directional secure communication can be achieved.