Chen Dan, Zhao Peiyan, Tang Linhai, Wang Minyan
J Opt Soc Am A Opt Image Sci Vis. 2024 Mar 1;41(3):424-434. doi: 10.1364/JOSAA.512023.
Underwater wireless optical communication is widely considered in the field of underwater communication due to its high bandwidth and low latency. In a real transmission link, the temperature and salinity of seawater, chlorophyll concentration, and bubble density vary with ocean depth. Therefore, the depth of the optical transmitter in seawater and the tilt angle of the beam will exhibit different beam transmission characteristics. In this paper, an underwater oblique-range layered channel model considering the combined effects of dynamic turbulence, absorption, and scattering is developed based on real data of seawater at different depths measured by the Global Ocean Observing Buoy Argo and the Woods Hole Oceanographic Institution BCO-DMO. The effects of transmission distance, transmitter tilt angle, and transmitter depth on the oblique-range transmission characteristics of the beam in seawater are discussed. The simulation results show that, at the same transmission distance, the beam centroid displacement increases with an increase in transmitter depth only when the transmitter is located above the interior of the thermocline. When the transmitter is located below the interior of the thermocline, the influence of the transmitter tilt angle on the beam centroid displacement decreases. This indicates that at different depths within the interior of the thermocline, the optical beam transmission characteristics exhibit significant variations.
由于其高带宽和低延迟，水下无线光通信在水下通信领域受到广泛关注。在实际传输链路中，海水的温度、盐度、叶绿素浓度和气泡密度会随海洋深度而变化。因此，光发射器在海水中的深度和光束的倾斜角度将呈现出不同的光束传输特性。本文基于全球海洋观测浮标Argo和伍兹霍尔海洋研究所BCO-DMO测量的不同深度海水的实际数据，建立了一个考虑动态湍流、吸收和散射综合影响的水下斜距分层信道模型。讨论了传输距离、发射器倾斜角度和发射器深度对海水中光束斜距传输特性的影响。仿真结果表明，在相同传输距离下，只有当发射器位于温跃层内部上方时，光束质心位移才会随着发射器深度的增加而增加。当发射器位于温跃层内部下方时，发射器倾斜角度对光束质心位移的影响减小。这表明在温跃层内部的不同深度处，光束传输特性呈现出显著变化。
