Wang Xinguang, Wang Le, Zhao Shengmei
Appl Opt. 2021 Sep 20;60(27):8321-8327. doi: 10.1364/AO.421880.
We introduce the model of a multi-Gaussian correlated Hankel-Bessel (MGCHB) beam generated by a multi-Gaussian Shell-model source and investigate the properties of the beam in anisotropic oceanic turbulence. Under Rytov approximation, the detection probability of the MGCHB beam and the channel capacity with MGCHB beams are derived; both the influence of oceanic turbulence and initial beam parameters on them are discussed by numerical simulations. The results show that the increase of the dissipation rate of kinetic energy per unit mass of fluid, the anisotropic coefficient, and the inner scale factor, as well as the decrease of the dissipation rate of mean-squared temperature and the temperature-salinity contribution ratio, can significantly improve the detection probability and the channel capacity. The results also indicate that the MGCHB beam is a better candidate than an Airy vortex beam for mitigating the influence of oceanic turbulence. Furthermore, smaller topological charge and larger orbital angular momentum modes number are beneficial to improve the detection probability and channel capacity, respectively. Moreover, the performance of the MGCHB beam with longer wavelength, smaller beam index, and larger transverse coherence width is conducive to enhancing the transmission quality through oceanic turbulence.
我们介绍了由多高斯壳模型源产生的多高斯相关汉克尔 - 贝塞尔（MGCHB）光束模型，并研究了该光束在各向异性海洋湍流中的特性。在 Rytov 近似下，推导了 MGCHB 光束的检测概率和基于 MGCHB 光束的信道容量；通过数值模拟讨论了海洋湍流和初始光束参数对它们的影响。结果表明，单位质量流体动能耗散率、各向异性系数和内尺度因子的增加，以及均方温度耗散率和温度 - 盐度贡献率的降低，都能显著提高检测概率和信道容量。结果还表明，在减轻海洋湍流影响方面，MGCHB 光束比艾里涡旋光束是更好的选择。此外，较小的拓扑电荷和较大的轨道角动量模式数分别有利于提高检测概率和信道容量。而且，波长较长、光束指数较小和横向相干宽度较大的 MGCHB 光束性能有利于提高通过海洋湍流的传输质量。
