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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.
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 相似文献
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采用线性化近似方法计算了单模激光系统的光强关联函数,讨论了光强关联函数随时间的演化关系,发现光强关联函数呈现周期振荡的现象.关联函数振荡的幅度和周期不受量子噪音强度、抽运噪音强度和交叉关联程度的影响,输入信号频率会改变关联函数振荡的周期和幅度,但不改变振荡的平衡位置,量子噪音强度会改变振荡极值的位置,四个参量都改变关联函数衰减的初始值,但关联函数对时间周期调制频率不敏感. 相似文献
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Stochastic resonance driven by time-modulated correlated coloured noise sources in a single-mode laser 总被引:1,自引:0,他引:1 下载免费PDF全文
This paper investigates the phenomenon of stochastic resonance in a
single-mode laser driven by time-modulated correlated coloured noise
sources. The power spectrum and signal-to-noise ratio R of the
laser intensity are calculated by the linear approximation. The
effects caused by noise self-correlation time τ1, τ2
and cross-correlated time τ3 for stochastic resonance
are analysed in two ways: τ1, τ2 and τ3 are
taken to be the independent variables and the parameters
respectively. The effects of the gain coefficient Γ and loss
coefficient K on the stochastic resonance are also discussed. It is found that besides the presence of the standard form and the broad sense of stochastic resonance, the number of extrema
in the curve of R versus K is reduced with the increase of the
gain coefficient Γ. 相似文献
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