Wu Cheng, Xing Wenge, Xia Linghao, Huang Huixin, Xu Chi
Appl Opt. 2019 Jan 1;58(1):102-108. doi: 10.1364/AO.58.000102.
The detection performance of the single-photon lidar (SPL) receiver is investigated as a function of optical attenuation and superconducting nanowire single-photon detector (SNSPD) parameters (detection efficiency and dead time) in a strong background environment. With detection theory, it is found that there is optimal attenuation to make detection probability the highest at a given false alarm probability, namely, optimal working conditions. Optical attenuation is proved to be required only when the background photon number is higher than a certain value; otherwise, it is not necessary. Furthermore, the performance of a Geiger-mode avalanche photodiode (GMAPD) is compared. Under optimized working conditions, the SNSPD-based receiver exhibits higher detection performance in a strong background environment than that of the GMAPD-based receiver due to shorter dead time, while in a low-noise environment, attenuation is not essential, and detection efficiency becomes the dominant factor. The theoretical result gives a reference for the SPL receiver system design to achieve optimal detection performance.
研究了单光子激光雷达（SPL）接收器在强背景环境下的探测性能与光学衰减以及超导纳米线单光子探测器（SNSPD）参数（探测效率和死时间）之间的关系。通过探测理论发现，在给定的误报概率下，存在使探测概率最高的最佳衰减，即最佳工作条件。事实证明，仅当背景光子数高于某一值时才需要光学衰减；否则，就没有必要。此外，还比较了盖革模式雪崩光电二极管（GMAPD）的性能。在优化的工作条件下，基于SNSPD的接收器在强背景环境中由于死时间较短而表现出比基于GMAPD的接收器更高的探测性能，而在低噪声环境中，衰减并非必不可少，探测效率成为主导因素。该理论结果为SPL接收器系统设计以实现最佳探测性能提供了参考。
