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通过在互耦合垂直腔面发射激光器(VCSELs)系统中增加外光注入,建立了一种基于偏振可调光反馈VCSEL驱动互耦合VCSELs混沌系统模型,分析了增加外光驱动对互耦合激光器随机特性的影响.以不可预测度作为随机特性的评价指标,采用信息论中的排列熵作为相应量化工具,对系统输出混沌信号的不可预测性进行定量分析.数值研究了光强度、时延、偏振旋转角度以及驱动激光器与耦合激光器间的频率失谐对输出信号随机特性的影响.结果表明:外光注入能够增大互耦合VCSELs输出混沌信号的排列熵,即外光注入能够有效提高耦合系统的随机特性;驱动激光器可调偏振片偏转角度调节到45?附近,注入强度适中,满足耦合强度大于驱动激光器自反馈强度条件,系统输出信号的排列熵较大;在耦合时延与驱动激光器反馈时延不相等的同时,增加驱动激光器与耦合激光器频率失谐,外光注入互耦合VCSELs的随机特性能够得到进一步提高.
A VCSEL chaotic system driven by VCSEL with polarization adjustable light feedback was established by adding extraneous light injection into the system of VCSELs. The chaotic system model of VCSELs driven by external light driving was analyzed. The unpredictability is taken as the evaluation index of stochastic character and the permutation entropy of information theory is used as the corresponding quantitative tool to quantitatively analyze the unpredictability of the chaotic signal output from the system.Numerical studies on the effects of light intensity, time delay, polarization rotation angle And the effect of the frequency detuning between the driving laser and the coupling laser on the random characteristics of the output signal.The results show that the extrinsic light injection can increase the permutation entropy of the output chaotic signal of the coupled VCSELs that the external light injection can effectively improve the random characteristics of the coupled system ; The driving laser adjustable polarizer deflection angle is adjusted to about 45 ?, injection intensity is moderate to meet the coupling strength is greater than the drive laser self-feedback strength conditions, the system output signal arrangement entropy larger; coupling delay and drive laser feedback delay Equal at the same time, increase the drive laser and coupled laser frequency detuning, outside Implanted VCSELs random nature mutual coupling can be further improved.