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利用两个电流偏置在不同值的半导体激光器(SL)构建一个延时互耦系统,实验研究了两个SL的非对称偏置电流和频率失谐Δf(=f1-f2,f1,f2分别对应SL1和SL2的自由振荡频率)对系统混沌同步性能的影响.研究结果表明:对于两个振荡频率一致的SL,当两个SL的偏置电流差异较大时系统能实现较好的混沌同步;通过调节两个SL的温度,使两个SL的振荡频率失谐,对于SL1电流远大于SL2电流的情形,正频率失谐(即f1>f2)将使得系统的同步性能下降,而适量的负频率失谐有助于进一步提高系统的同步性能.理论仿真结果与实验结果基本符合.
A delay-time mutual coupling system is constructed by using two current biased semiconductor lasers (SL) with different values. The asymmetric bias current and frequency detuning Δf (= f1-f2, f1, f2 Which corresponds to the free oscillation frequency of SL1 and SL2) on the chaotic synchronization performance of the system.The results show that the system can achieve better chaos synchronization when the bias currents of the two SLs are quite different for two SLs with the same oscillation frequency ; By adjusting the temperature of the two SL, the two SL oscillation frequency detuning, SL1 current is much larger than SL2 current situation, the positive frequency detuning (ie f1> f2) will make the system’s synchronization performance degradation, while the amount of Negative frequency detuning can help to further improve the system synchronization performance.The theoretical simulation results are in good agreement with the experimental results.