关联白噪声作用下双模激光增益模型的随机共振  

Stochastic Resonance in the Gain-noise Model of a Two-mode Laser Driven by Cross-correlated White Noises

作　　者：汪志云[1] 陈培杰[1] 张良英[1] 

机构地区：[1]湖北文理学院物理与电子工程学院,湖北襄阳441053

出　　处：《河北师范大学学报（自然科学版）》2014年第5期463-468,共6页Journal of Hebei Normal University：Natural Science

基　　金：国家自然科学基金(11045004);湖北省教育厅重点研究项目(D20132603)

摘　　要：运用线性近似方法,计算得到了关联白噪声和输入周期信号共同作用下双模激光增益模型输出信号光强的自关联函数、功率密度谱和信噪比.讨论了信噪比随系统参数的变化.研究发现:在噪声关联程度λ<0时,信噪比随噪声强度的变化出现了传统的随机共振现象,系统双模参数都会影响信噪比大小和共振现象;在输入信号频率Ω较小、净增益系数a1较大时,信噪比随自饱和系数c2及双模交叉耦合系数b的变化均出现随机共振,且随着Ω的增大或a1的减小,共振现象逐渐减弱,直至消失.By means of linear approximation method, the steady-statemean intensity correlation function and opwer spectrum and signal -to-noise ratio （R） of a gain-noise model of two-mode laser driven by a periodic signal and two cross-correlated white noises are calculated, and the influences of system parameter on R are discussed. The results show that the typical stochastic resonance phenomena are detected in the laser system by virtue of the curves of R versus the intensities of pump noise and quantum noise when the crosscorrelation coefficient λ〈0. Both the values of R and the resonance phenomenon are influenced by the sys- tem parameter. Moreover,if the value of input signal frequency 12 is small or the net-gain coefficient a1 is large, the resonance phenomena are also found in the curves of R versus the saturation coefficient Cz and cross coupling coefficient b,and with the increase of Ω and the decrease of a1, the resonance gradually reduces until it disappears.

关 键 词：噪声 双模激光 信噪比 随机共振 

分 类 号：O414.2[理学—理论物理]