面向水下应用的改进型光子计数通信方法

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532 nm、通信速率为50 kb/s、信噪比为5.14的情况下，实现84.24 bit-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。

Abstract

Underwater laser communication is influenced by the absorption and scattering of water, which causes severe signal energy attenuation during propagation. Laser communication based on the photon counting is considered as an effective way to resist signal loss and increase communication distance because of its ultra-high detection sensitivity. However, since communication data recovery is usually realized by detecting electrical pulse at the output of single photon detector directly in traditional photon counting communication, the communication bit error rate would be easily influenced by background light noise. In this paper, an improved method is proposed and studied to solve this problem. In our approach, the photons arrived at the communication receiver are converted into electrical pulses by single photon detector first. Then, communication data is recovered through counting the electrical pulse number on unit time. The experimental result shows that detection sensitivity of 84.24 bit-1 can be realized by the proposed method, when the communication wavelength is 532 nm, the communication rate is 50 kb/s, and the signal to noise ratio is 5.14. The novel approach proposed in this paper provides a new technical idea for high-sensitivity underwater laser communication.

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韩彪, 赵卫, 汪伟, 苏玉龙, 刘继芳. 面向水下应用的改进型光子计数通信方法[J]. 光学学报, 2016, 36(8): 0806004. Han Biao, Zhao Wei, Wang Wei, Su Yulong, Liu Jifang. Modified Photon Counting Communication Method for Underwater Application[J]. Acta Optica Sinica, 2016, 36(8): 0806004.

面向水下应用的改进型光子计数通信方法

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