Chen Xinwei, Jin Mengyin, Chen Honglan, Wang Yupeng, Qiu Pengjiang, Cui Xugao, Sun Baoqing, Tian Pengfei
Opt Lett. 2021 Apr 15;46(8):1938-1941. doi: 10.1364/OL.421807.
This work proposes an underwater wireless optical communication (UWOC) system based on computational temporal ghost imaging (CTGI) and a low-bandwidth high-sensitivity avalanche photodiode. After measuring the attenuation coefficient of water, a series of neutral density filters is used to attenuate the optical power to estimate the distance of UWOC. Experimental results show that under the conditions of 4 GHz transmitting frequency and 144.37 m estimated distance, through CTGI, we can achieve error-free transmission, and the peak signal-to-noise ratio is much higher than on-off keying. Additionally, after adopting the segmented reconstruction method, under the condition of 4 GHz transmitting frequency and 193.10 m estimated distance, we can also achieve error-free transmission. At the same time, the relationship between UWOC performance and the number of segments is also studied. This research provides a novel UWOC technique that enables high-frequency transmission signals to be detected by a low-bandwidth photodetector for long-distance UWOC.
这项工作提出了一种基于计算时间鬼成像（CTGI）和低带宽高灵敏度雪崩光电二极管的水下无线光通信（UWOC）系统。在测量水的衰减系数后，使用一系列中性密度滤光片来衰减光功率以估计UWOC的距离。实验结果表明，在4 GHz发射频率和估计距离为144.37 m的条件下，通过CTGI，我们可以实现无差错传输，并且峰值信噪比远高于开关键控。此外，采用分段重建方法后，在4 GHz发射频率和估计距离为193.10 m的条件下，我们也可以实现无差错传输。同时，还研究了UWOC性能与段数之间的关系。这项研究提供了一种新颖的UWOC技术，使高频传输信号能够被低带宽光电探测器检测到，用于长距离UWOC。
