调制信号对光学双稳态系统输出信噪比的影响

摘要

In order to investigate the influence of modulating signal on the output signal-to-noise ratio of the optical bistability system,the intensity correlation function and the output signal-to-noise ratio of an abortive optical bistability system driven by a periodic signal were calculated by using the linear approximation method.With the change of the amplitude and the frequency of the modulation signal,the intensities of the pump and quantum noise of the modulation signal were studied to find their influences on the signal-to-noise ratio.The results show that when the pump noise intensity and the frequency of the modulation signal increase and the quantum noise intensity decreases,the signal-to-noise ratio increases.%为了探讨调制信号对光学双稳态系统输出信噪比的影响,采用线性化近似方法计算得到了受周期性信号调制的光学双稳态系统的光强关联函数和输出信噪比;分析了输出信噪比随调制信号振幅、调制信号频率变化时,泵噪声强度、调制信号频率、量子噪声强度、调制信号振幅对输出信噪比的影响.研究表明,增大泵噪声强度和调制信号频率,减小量子噪声强度,均能够增加系统输出信噪比.