用线性化近似方法,计算了具有色关联的色抽运噪声和色量子噪声驱动的光学双稳系统的 光强相对涨落,讨论了噪声间的关联和输入信号对光强相对涨落的影响,发现光强相对涨落随抽 运噪声强度和量子噪声强度的变化过程中存在极小值,且光强相对涨落与噪声间的关联程度密切 相关,但输入信号对其影响不大。

The stochastic resonance (SR) of an optical bistable system with cross-correlated additive white and multiplicative colored noises and periodic signal is studied using the unified colored noise approximation and the theory of signal-to-noise ratio (SNR). Results show that cross-correlation intensity \lambda enforces the SR of the system. The position of the peak on the SNR-\tau curves moves to the right direction along with the increase of \lambda (\tau is the self-correlation time of the multiplicative colored noise). We find the SR phenomenon in the SNR-D and SNR-Q curves (D and Q are the intensities of the additive and multiplicative noises, respectively), but not in the SNR-\lambda curves.

Considering an optical bistable system with cross-correlated additive white noise and multiplicative colored noise, we study the effects of correlation between the noises on the correlation function C(s) using the unified colored noise approximation and the Stratonovich decoupling ansatz formalism. The effects of the self-correlation time \tau of the multiplicative colored noise and the correlation intensity \lambda between the two noises are studied with numerical calculation. It is found that C(s) increases with the increase of the self-correlation time \tau, but decreases with the increase of the correlation intensity \lambda. At large value of \tau, there is almost no change for C(s) when  changes.

根据声光双稳系统混沌驱动下的动力学行为,提出利用系统的相位特性实现信息的混沌加密,并且由接收端混沌驱动产生的混沌信号完成信息提取的原理。发现在较大的噪声覆盖下仍然可以实现信息的安全传送,由于信息解密不需要与载波完全同步的混沌信号而只利用传输信号与接收端被驱动系统输出信号的相位关系,因此这种方法具有实际应用价值。