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为了实现强衰减条件下的无线光通信,研究利用单光子探测器检测接收端光信号。在分析门控模式盖革雪崩光电二极管(Gm-APD)工作原理的基础上,基于泊松分布,对单个门内Gm-APD的触发概率进行研究。根据二项分布,建立了基于单个Gm-APD的误码率模型,研究了单个门内的信号光子数、背景光子数与信号周期内开门次数对误码率的影响。理论分析与数值仿真结果表明,信号周期内开门次数决定了系统可能达到的最低误码率;误码率随信号周期内开门次数增加呈指数下降;将误码率控制在10-3相比于10-9,接收灵敏度将至少提高3 d B。最后通过实验测量了给定条件下的误码率,并与模型仿真结果进行对比,验证了模型的正确性。
In order to realize the wireless optical communication with strong attenuation, the single-photon detector is used to detect the optical signal at the receiver. Based on the analysis of the working principle of Gam-Avalanche Photodiode (Gm-APD) in gated mode, the trigger probability of Gm-APD in a single gate is studied based on Poisson distribution. According to the binomial distribution, a bit error rate model based on a single Gm-APD is established, and the effect of the number of signal photons, the background photons and the number of times of opening a gate in a single gate on the bit error rate is studied. The results of theoretical analysis and numerical simulation show that the number of times the door is opened in the signal period determines the lowest possible bit error rate. The bit error rate decreases exponentially with the increase of the number of times the signal is received. The bit error rate is controlled at 10-3, 10-9, the receiver sensitivity will be increased by at least 3 d B. Finally, the bit error rate under given conditions is measured experimentally, and compared with the simulation results to verify the correctness of the model.