Gerçekcioğlu Hamza
J Opt Soc Am A Opt Image Sci Vis. 2014 Sep 1;31(9):1963-8. doi: 10.1364/JOSAA.31.001963.
Formulation of the on-axis scintillation index of a focused Gaussian beam in weak oceanic turbulence is derived by using the Rytov method, and using this formulation, the average bit error rate (BER) is evaluated. The scintillation indices of collimated, focused Gaussian, plane, and spherical beams are compared. The scintillation index and BER versus the average signal-to-noise ratio is found by using the log-normal distributed intensity for the collimated and focused Gaussian beams, which are exhibited for various source sizes α(s), focal lengths F(s), rates of dissipation of the mean squared temperature χ(T), and rates of dissipation of the turbulent kinetic energy per unit mass of fluid ε. Focused beams are found to have important advantages over collimated beams. For the focused beam, as the source size increases, the scintillation index and BER decrease. When the focal length is equal to the propagation length, the BER is found to possess the smallest value. The BER is proportional to χ(T), but inversely proportional to ε.
利用 Rytov 方法推导了弱海洋湍流中聚焦高斯光束轴上闪烁指数的公式，并使用该公式评估了平均误码率（BER）。比较了准直光束、聚焦高斯光束、平面光束和球面光束的闪烁指数。对于准直光束和聚焦高斯光束，通过使用对数正态分布强度，得出了闪烁指数和误码率与平均信噪比的关系，这些关系针对各种源尺寸α(s)、焦距F(s)、平均平方温度的耗散率χ(T)以及单位质量流体的湍动能耗散率ε进行了展示。结果发现聚焦光束相对于准直光束具有重要优势。对于聚焦光束，随着源尺寸的增加，闪烁指数和误码率会降低。当焦距等于传播长度时，误码率具有最小值。误码率与χ(T)成正比，但与ε成反比。
