摘要
将噪声和信号以相乘的形式引入单模激光系统,采用线性化近似方法计算了具有色关联的色泵噪声和色量子噪声驱动下光强的相关函数,通过对相关函数的傅里叶变换,得到光强的功率谱及信噪比.研究结果表明,不仅信噪比随着泵噪声自关联时间τ1的变化可以出现随机共振现象,研究输出总信号功率随着泵噪声自关联时间τ1的变化时也发现了共振现象.并详细讨论了输入信号频率Ω及激光系统本身性质的参量γ对随机共振的影响.
The noise and the signal were introduced multiplicatively into a single-mode laser system, Using the linear approximation method, the intensity correlation function was calculated of a gain-noise with an exponential function. The intensity power spectrum and signal-to-noise ratio were got through. Fourier transform of intensity correlation function. It shown that stochastic resonance appears both in the signal-tonoise ratio and the output signal power versus self-correlation time τl of pump noise curve, influences on stochastic resonance of modulation signal frequency Ω and parameter γ of the laser system.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2005年第8期119-120,共2页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(19975020)
襄樊学院自然科学基金资助
关键词
噪声
指数形式互关联
功率谱
信噪比
随机共振
noise
correlation exponential function
power spectrum
signal-to-noise ratio
stochastic resonance
