J Opt Soc Am A Opt Image Sci Vis. 2023 Mar 1;40(3):492-501. doi: 10.1364/JOSAA.479018.
The calculation of optical system performance for laser beam propagation in optical turbulence, such as bit error rate (BER), signal-to-noise ratio, and probability of fade, requires the knowledge of scintillation. In this paper, we show the analytical expressions of the aperture-averaged scintillation using a new recently introduced power spectrum of the refractive index fluctuations for underwater turbulence, the oceanic turbulence optical power spectrum (OTOPS). In addition, we use this main result to investigate the impact of weak oceanic turbulence on free-space optical system performance for a propagating Gaussian beam wave. Similar to the atmospheric turbulence case, results show that aperture averaging can reduce the mean BER and the probability of fade several orders of magnitude if the receiver aperture is chosen with a diameter larger than the Fresnel zone, /. Being valid for weak turbulence regime in any natural waters, results present the variations of irradiance fluctuations and the performance of underwater optical wireless communication systems depending on the practical values of average temperature and average salinity concentration that can be encountered in any world's waters.
激光在光学湍流中传播的光学系统性能的计算，如误码率（BER）、信噪比和衰落概率，需要了解闪烁现象。在本文中，我们使用新的海洋湍流光学功率谱（OTOPS），即折射率波动的功率谱，展示了孔径平均闪烁的解析表达式。此外，我们使用这一主要结果研究了弱海洋湍流对传播高斯光束波的自由空间光学系统性能的影响。与大气湍流情况类似，结果表明，如果接收孔径的直径大于菲涅尔区，/，则孔径平均可以将平均 BER 和衰落概率降低几个数量级。由于在任何天然水中都适用于弱湍流情况，因此结果显示了辐照度波动的变化以及水下光无线通信系统的性能，这取决于在任何世界水域中都可能遇到的平均温度和平均盐度浓度的实际值。
