运用绝热近似理论,研究了由加性噪声和乘性噪声及周期信号驱动的光学双稳系统的随机共振现象.发现该模型中输出信噪比R~随着加性噪声强度Da的变化曲线中会出现随机共振现象,而信噪比R~随着乘性噪声强度Dm的变化曲线是单调减小的,信噪比曲线中没有出现随机共振现象.因此,加性噪声和乘性噪声对输出信噪比的影响是不同的.
The stochastic resonance (SR) in an optical bistable system under the simultaneous action of muhiplicative and additive noises and periodic signal is studied using the adiabatic approximation theory. The signal-to-noise ratio( SNR) is a non-monotonic function of intensity of additive noise, in which the SR phenomenon appears. The SNR decreased with the intensity of multiplicative noise, and SR phenomenon does not appear. So the effects of additive and multiplicative noise on the output SNR are different.