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水下激光通信由于受水体吸收和散射的影响,信号传输过程中能量衰减严重。基于光子计数的激光通信具有极高的探测灵敏度,是抑制信号衰减、提高通信距离的有效方法。传统的光子计数通信是通过检测单光子探测器有无电脉冲输出来实现通信数据还原的,通信误码率容易受到背景光噪声的影响。针对这一问题,提出并研究了一种改进方法,首先在通信接收端利用单光子探测器将光子转换为电脉冲,然后通过统计单位比特时间内的电脉冲数目来还原通信数据。实验结果表明:提出的方法能够在通信波长为532nm、通信速率为50kb/s、信噪比为5.14的情况下,实现84.24bit-1的探测灵敏度。所提出方法能够为高灵敏度水下激光通信提供一种新的技术思路。
Due to the influence of water absorption and scattering, underwater laser communication has serious energy attenuation during signal transmission. Based on photon counting laser communication with high detection sensitivity, it is an effective method to suppress signal attenuation and improve communication distance. The traditional photon counting communication is to detect the presence or absence of electrical pulse output of a single-photon detector to restore the communication data. The communication bit error rate is easily affected by background light noise. To solve this problem, an improved method is proposed and studied. Firstly, a photon detector is used to convert photons to electrical pulses at the receiving end of the communication, and then the communication data is restored by counting the number of electrical pulses per bit time. The experimental results show that the proposed method can achieve 84.24bit-1 detection sensitivity with a communication wavelength of 532nm, a communication rate of 50kb / s and a signal to noise ratio of 5.14. The proposed method can provide a new technical idea for high sensitivity underwater laser communication.