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通过分步傅里叶算法对光纤传输模型——非线性薛定谔方程进行求解,研究光纤的色散和非线性对新型闭环双向三激光器混沌保密通信系统的影响。分析了在色散、非线性以及色散和非线性共同作用下,光纤传输距离对混沌信号和解调信息质量的影响。结果表明:随着传输距离增加,色散导致混沌信号展宽,展宽比率也随之增大;混沌信号同步性逐渐变差,导致解调信息质量变差。非线性不影响混沌信号的时域波形,但非线性与色散的共同作用,导致混沌信号迅速变化,混沌信号同步性迅速变差,使解调信息质量急剧恶化。
The fiber transmission model - nonlinear Schrödinger equation was solved by a fractional Fourier algorithm, and the influence of dispersion and nonlinearity of the fiber on the chaotic secure communication system of a new type of closed-loop bi-directional three-lasers was studied. The influence of optical fiber transmission distance on the quality of chaotic signal and demodulation information under dispersion, nonlinearity, dispersion and nonlinearity is analyzed. The results show that with the increase of transmission distance, the chromatic dispersion leads to broadening of the chaotic signal and broadening of the broadening ratio, and the synchronization of the chaotic signal becomes worse. As a result, the quality of the demodulated information becomes worse. Nonlinearity does not affect the time-domain waveform of chaotic signal, but the combination of nonlinearity and dispersion leads to the rapid change of chaotic signal and the rapid deterioration of synchronization of chaotic signal, which deteriorates the quality of demodulated information rapidly.