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提出光纤环形外腔延时光反馈半导体激光器混沌自相位调制(SPM)提高混沌载波发射机带宽方法,建立了有光纤环形腔传输的SPM光反馈控制下的激光动力学物理模型.理论导出SPM作用下激光双反馈频率失谐公式,指出SPM产生的非线性相移影响了激光器增益和线宽增强因子,其光纤二阶非线性效应使激光振幅和相位变化更加丰富,其产生的非线性相移进一步增加了新的频率分量并使频谱展宽.数值结果表明,SPM确能让激光器混沌带宽增加到4倍以上,能使激光混沌张弛振荡频率增加到2.56倍,激光混沌带宽随光纤长度、光纤耦合比例系数、反馈系数、光纤二阶非线性系数等增加而增宽.
The method of chaotic self-phase modulation (SPM) for optical fiber ring-shaped external cavity time-lapse optical feedback semiconductor lasers is proposed to improve the bandwidth of chaotic carrier transmitters, and the laser dynamics model of SPM optical feedback control with optical fiber ring cavity transmission is established. It is pointed out that the non-linear phase shift caused by SPM affects the laser gain and linewidth enhancement factor. The second-order nonlinear effect of fiber makes the laser amplitude and phase change more abundant. The nonlinear phase shift The new frequency component is added and the spectrum is broadened.The numerical results show that SPM does increase the chaotic bandwidth of the laser more than 4 times and can increase the frequency of laser chaos relaxation to 2.56 times.The chaotic bandwidth of laser varies with the length of fiber and the coupling of fiber Proportional coefficient, feedback coefficient, optical fiber second-order nonlinear coefficient increases and widens.