光电负反馈下1550nm垂直腔表面发射激光器的动力学特性

Nonlinear Dynamics of 1550 nm Vertical-cavity Surface-emitting Lasers Subject to Negative Optoelectronic Feedback

基于激光输出的时间序列、功率谱以及相图,对1 550 nm垂直腔表面发射激光器(1 550 nmVCSELs)在光电负反馈作用下的动力学特性进行了研究.结果表明:固定偏置电流,在不同反馈强度下,光电负反馈1 550 nm VCSEL可呈现规则脉冲态、准周期态、混沌脉冲态等非线性动力学态;固定反馈强度,偏置电流取不同值时.1 550 nm-VCSEL也可呈现脉冲态、准周期态、混沌脉冲态等不同的非线性动力学状态.给出了1 550 nm VCSEL非线性动力学状态在偏置电流和反馈强度构成的参量空间分布.分析了激光器的动态演化路径,结果表明:在较小偏置电流和弱光电反馈下,激光器主要工作在稳态:随着偏置电流增加,激光器输出的动力学态通常随反馈强度的增加以规则脉冲态-准周期态-规则脉冲态的方式循环演化到混沌脉冲态;当偏置电流增加到一定值后,激光器输出的动力学态随反馈强度的增加主要以规则脉冲态准周期态混沌脉冲态的方式循环演化.

Based on the observed time series,power spectra,and phase portraits of the laser output,the nonlinear dynamics of 1 550 nm Vertical-Cavity Surface-Emitting Lasers（1 550 nm-VCSELs） under the negative optoelectronic feedback were investigated.The results show that,for a given bias current,1 550nm-VCSEL subject to negative optoelectronic feedback can exhibit rich nonlinear dynamic states such as Regular Pulsing（RP）,Quasiperiodic Pulsing（QP）,and Chaotic Pulsing（CP） under different＂ feedback strength.On the other hand,for a fixed feedback strength,through adjusting the values of the bias current,diverse dynamical states can also be observed in 1 550 nm-VCSEL subject to negative optoelectronic feedback.Finally,a mapping of dynamical states was given in the parameter space of bias current and feedback strength,and the evolution routes of dynamic states were also analyzed.For the case of small bias current and weak optoelectronic feedback,the laser almost operates at stable state（S）.For the case of higher bias current,the dynamical behaviors of the laser follow a repeated RP-QP-RP route to CP state.When the bias current is increased to a certain level,the dynamical behaviors of the laser follow a repeated RP-QP-CP evolution route with the increase of optoelectronic feedback strength.