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针对用于量子保密通信中单光子探测器需要高精度温控系统的情况,分析了其温控系统中数字平均方案对系统信噪改善比的影响,给出了信噪改善比与平均次数、采样周期、总采样时间和白噪声带宽的函数关系.针对实际应用中总采样时间有限的情况,分别就平均次数、采样周期两个物理参量对系统信噪改善比的作用进行了计算,给出了总采样时间一定的情况下,信噪改善比的表达式,并定义了最佳的采样次数.
For the single-photon detector used in quantum secure communication, a high-precision temperature control system is needed. The influence of the digital average scheme in the temperature control system on the signal-to-noise improvement ratio of the system is analyzed. The improvement ratio of signal to noise and the average number of times, Sampling period, total sampling time and white noise bandwidth.According to the practical application of the total sampling time is limited, respectively, the average number of sampling period of the two physical parameters of the system to improve the performance of signal to noise ratio is given, given In the case of a certain total sampling time, the signal to noise ratio is improved, and the optimal number of sampling times is defined.