摘要
在色噪声间的关联程度受时间周期调制的激光系统中,研究噪声受信号调制情况下的随机共振.用线性化近似的方法计算了光强关联函数及信噪比.具体讨论信噪比随噪声强度、噪声自关联时间、信号频率以及时间周期调制频率的变化关系.发现一种新的随机共振:信噪比随时间周期调制频率的变化出现周期振荡型随机共振;发现广义随机共振:信噪比随抽运噪声自关联时间的变化、随信号频率的变化出现随机共振;同时也存在典型的信噪比随噪声强度的变化而出现的随机共振.而信噪比随量子噪声自关联时间的变化表现为抑制.
For the laser system in which the correlation intensity between color noises is modulated by the time period,we investigate the stochastic resonance with the signal modulation of the noise. By means of the linear approximation,we calculate the intensity correlation function and signal-to-noise ratio （SNR） and discuss the evolution of the SNR with the noise intensity and self-correlation time of noises and signal frequency and time period modulation frequency. A new stochastic resonance is found. The evolution of the signal-noise ratio with the time period modulation frequency reveals periodic oscillation. We obtain the generalized stochastic resonance,in which the evolution of the signal-noise ratio with the self-correlation time of the pump noises and signal frequency presents the stochastic resonance. The typical stochastic resonance of the signal-noise ratio with the noise intensity is obtained also. The evolution of the signal-noise ratio with the self-correlation time of the quantum noise shows the restrainment.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2009年第3期1403-1409,共7页
Acta Physica Sinica
关键词
信号调制
时间周期调制
噪声间关联程度
周期振荡型随机共振
signal modulation,time period modulation,correlation intensity between color noises,stochastic resonance with the period oscillation
