耦合反馈控制双环掺铒光纤激光器混沌

 提出双环掺铒光纤激光器耦合反馈控制混沌的物理模型，利用定向耦合器将系统的输出变量反馈到系统中，通过间接控制损耗系数，并选取适当的反馈系数，实现对系统混沌的控制。分析了反馈系数对激光器由混沌态进入周期态和稳定态的动力学行为的影响。数值模拟表明：改变系统损耗系数，双环掺铒光纤激光器可由周期态进入混沌态；加入耦合反馈，适当调制反馈系数，可以将双环光纤激光器混沌控制到周期态和稳定态上；提高系统反馈系数，系统进入稳定态的时间变短。选取不同的系统初值，激光器总能得到两种不同的奇怪吸引子，可见双环掺铒光纤激光器具有双稳态特征。

Controlling chaotic behaviour in erbium-doped fiber ual-ring laser with coupling feedback

A method of controlling chaotic behavior in erbium-doped fiber dual-ring laser is proposed by using couplers to feed the laser outputs back into the system and control the decay rate of the system indirectly. The chaotic fiber laser is controlled by selecting appropriate feedback coefficients which are defined by the decay rate and the coupling coefficient of the system. The simulation results show that couplers are used to modulate the decay rate and the feedback coefficient, and the chaotic fiber can be controlled into the single-leriod, dual-period and stable states respectively. The larger the feedback coefficients is, the faster the laser enters into a stable state.