In real-life marine environments, the composition and grain size of suspended sediments and the resuspension and sedimentation of sediments caused by turbulence may have a significant impact on underwater wireless optical communication (UWOC). However, to date, researchers have not conducted quantitative research on this issue. To this end, we innovatively study the effects of different compositions and grain sizes of suspended sediments on UWOC and the effects of turbulence-induced sediment resuspension and sedimentation on UWOC in this paper. Quartz and kaolin with different grain sizes are used to simulate sediments in seawater. An oscillating grid that can vary frequency and stroke is used to generate turbulence of different intensities. By comparing the turbidity and optical power density of different simulated sediments with different grain sizes, we find that the smaller the grain size of the simulated sediments, the higher the bit error rate (BER) under the same turbidity. But different simulated sediments with different grain sizes have similar effects on BER performance under the same optical power density. Therefore, turbidity can be used to characterize the changes of underwater channels, and optical power density can be used to evaluate the attenuation of light at the receiving end after transmission through the underwater channel. By continuously changing the frequency of the grid to cause the sediments to resuspend and sink, we prove that the process of turbulence-induced sediment resuspension and sedimentation can seriously affect the BER performance. The larger the frequency of the grid, the greater the turbulence intensity and the worse the BER performance. This study lays a foundation for the practical application of UWOC in mobile ocean observation networks.

中文翻译：

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湍流引起的沉积物再悬浮和沉积对水下无线光通信的影响

在现实海洋环境中，悬浮沉积物的成分和粒度以及湍流引起的沉积物的再悬浮和沉积可能对水下无线光通信（UWOC）产生重大影响。但迄今为止，研究人员尚未对这一问题进行定量研究。为此，本文创新性地研究了不同成分和粒径的悬浮沉积物对UWOC的影响以及湍流引起的沉积物再悬浮和沉降对UWOC的影响。使用不同粒度的石英和高岭土来模拟海水中的沉积物。可以改变频率和冲程的振荡网格用于产生不同强度的湍流。通过比较不同粒径的不同模拟沉积物的浊度和光功率密度，我们发现模拟沉积物的粒径越小，相同浊度下的误码率（BER）越高。但在相同光功率密度下，不同颗粒尺寸的模拟沉积物对误码率性能的影响相似。因此，可以用浊度来表征水下通道的变化，用光功率密度来评估光通过水下通道传输后在接收端的衰减情况。通过不断改变网格的频率使沉积物重新悬浮和下沉，我们证明了湍流引起的沉积物重新悬浮和沉降的过程会严重影响BER性能。电网频率越大，湍流强度越大，误码率性能越差。本研究为UWOC在移动海洋观测网络中的实际应用奠定了基础。