Vali Zahra, Gholami Asghar, Ghassemlooy Zabih, Michelson David G, Omoomi Masood, Noori Hamed
J Opt Soc Am A Opt Image Sci Vis. 2017 Jul 1;34(7):1187-1193. doi: 10.1364/JOSAA.34.001187.
Turbulence affects the performance of underwater wireless optical communications (UWOC). Although multiple scattering and absorption have been previously investigated by means of physical simulation models, still a physical simulation model is needed for UWOC with turbulence. In this paper, we propose a Monte Carlo simulation model for UWOC in turbulent oceanic clear water, which is far less computationally intensive than approaches based on computational fluid dynamics. The model is based on the variation of refractive index in a horizontal link. Results show that the proposed simulation model correctly reproduces lognormal probability density function of the received intensity for weak and moderate turbulence regimes. Results presented match well with experimental data reported for weak turbulence. Furthermore, scintillation index and turbulence-induced power loss versus link span are exhibited for different refractive index variations.
湍流会影响水下无线光通信（UWOC）的性能。尽管此前已通过物理模拟模型对多次散射和吸收进行了研究，但对于存在湍流的UWOC，仍需要一个物理模拟模型。在本文中，我们提出了一种用于湍流海洋清水中UWOC的蒙特卡罗模拟模型，该模型的计算强度远低于基于计算流体动力学的方法。该模型基于水平链路中折射率的变化。结果表明，所提出的模拟模型能够正确再现弱湍流和中等湍流状态下接收强度的对数正态概率密度函数。给出的结果与弱湍流的实验数据吻合良好。此外，还展示了不同折射率变化下闪烁指数和湍流引起的功率损耗与链路跨度的关系。
