Stochastic Resonance in a Single-Mode Laser Driven by Pump Noise and QuantumNoise with Cross-Correlated Real and Imaginary Parts  

作　　者：CHENGQing-Hua CAOLi WANGJun WUDa-Jin 

机构地区：StateKeyLaboratoryofLaserTechnology,HuazhongUniversityofScienceandTechnology,Wuhan430074,China

出　　处：《Communications in Theoretical Physics》2004年第4X期553-556,共4页理论物理通讯（英文版）

基　　金：国家自然科学基金，the Emphases Item of Education Office of Hubei Province of China under

摘　　要：We present an analytic investigation of the signal-to-noise ratio (SNR) by studying a signal modulated model of a single-mode laser system driven by pump noise and quantum noise with correlated real and imaginary parts,and find there is a maximum in the curve of the dependence of SNR upon the cross-correlation coefficient λq between the real part and the imaginary part, i.e., stochastic resonance appears in the SNR vs. λq curve. Moreover, when the SNR is at the maximum, the cross-correlation coefficient λq = 0, which is coincidentally at the minimum of the mean normalized intensity fluctuation. The influences on stochastic resonance by the intensities of the pump and the quantum noise, the amplitude of the modulation signal, and the net gain of the laser are also studied. Furthermore, in order to ensure that the results obtained in this paper is reliable, the valid range for the linear approximation method is discussed.

关 键 词：泵浦噪声 量子噪声 单模激光器 随机响应 信噪比 

分 类 号：TN911.4[电子电信—通信与信息系统] TN249[电子电信—信息与通信工程]