调频信号的单模激光线性模型随机共振  

Stochastic resonance of frequency modulated signals in a linear model of single-mode laser

作　　者：张良英[1] 金国祥[2] 曹力[3] 

机构地区：[1]襄樊学院物理与电子信息技术系,襄樊441053 [2]武汉工程大学计算机科学与工程学院,武汉430073 [3]华中科技大学激光技术国家重点实验室,武汉430074

出　　处：《物理学报》2008年第8期4706-4711,共6页Acta Physica Sinica

基　　金：湖北省教育厅科研基金重点项目(批准号:D200725001)资助的课题~~

摘　　要：对单模激光增益模型的光强方程加入调频信号,用线性化近似方法计算了以δ函数形式关联的两白噪声驱动下光强的输出功率谱及信噪比.结果表明,信噪比随抽运噪声和量子噪声强度的变化可出现典型随机共振,受调制信号振幅的影响,信噪比随载波信号频率和调制信号频率的变化出现抑制、单调上升、共振、抑制和共振等几种情况.By adding frequency modulated signal to the equation of the laser intensity of the gain-noise model of the single-mode lasers,we use the linear approximation method to calculate the power spectrum and signal-to-noise ratio（SNR） of the laser intensity,which is driven by two white noises correlated in the form of δ function.The result shows that the SNR shows typical stochastic resonance with the change of intensities of the pump noise and quantum noise.As the amplitude of a modulated signal has an effect on the SNR,it shows suppression,monotonic increase,resonance,suppression and resonance and so on,with the varing of the frequencies of the carrier signal and modulated signal.

关 键 词：抽运噪声 单模激光 随机共振 调频信号 

分 类 号：TN911[电子电信—通信与信息系统]