半导体激光器混沌相位共轭反馈控制方法

提出了半导体激光器混沌相位共轭反馈(PCF)控制方法,建立了相位共轭反馈控制条件下激光器电流激发混沌的物理模型,发现其混沌控制物理机制是相位共轭反馈影响改变了激光器非线性增益和线宽增强因子特性,控制了系统的动力学行为及频率特性,其影响程度与反馈系数、延迟时间和光线宽增强因子等有关。数值模拟结果表明,在不同强度的光反馈下,通过调节相位共轭反馈光的延迟时间可以控制混沌激光到周期态、双周期态、多周期态等;发现相位共轭反馈控制特点是反馈光场和输出激光处于相干增强状态去实现混沌控制,且能控制实现激光器功率增强的周期脉冲输出。

Controlling Chaos in Semiconductor Lasers by Phase Conjugation Feedback

A method of controlling chaos is presented by phase conjugation feedback(PCF) in a semiconductor laser.The physical model of controlling chaos produced by modulating the current of semiconductor laser is set up under the condition of PCF.The physical mechanism is found that the nonlinear gain coefficient and linewidth enhancement factor of laser are affected by PCF,the system dynamical behavior and its frequency characterization can be changed and controlled.The effect quantity relates to the feedback coefficient, the delay time and the linewidth enhancement factor.Numerical simulations show that chaos is controlled into the periodic state,the dual-periodic state,the multi-periodic state respectively by controlling PCF light delay time under the conditions of different PCF light intensity.And the laser emitting power is increased by PCF when chaos are controlled in all kinds of periodic states because that the performance characterization of the PCF light can produce the coherent function on the laser emitting light to realize controlling chaos in PCF controlling chaos processes.