Average capacity of OAM-multiplexed FSO system with vortex beam propagating through non-Kolmogorov turbulence
Average capacity of OAM-multiplexed FSO system with vortex beam propagating through non-Kolmogorov turbulence
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DOI：
10.1109/cc.2016.7733040
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发表时间：
2016-10
影响因子：
4.1
通讯作者：
H. Tang;W. Xu;Guohua Wu
中科院分区：
文献类型：
--
作者：
H. Tang;W. Xu;Guohua Wu
涡旋光束在湍流大气中的传输具有重要的理论研究和实际应用价值。基于推广的惠更斯-菲涅耳积分和Rytov近似，给出了轨道角动量（OAM）复用拉盖尔-高斯（LG）光束通过非柯尔莫哥洛夫湍流传输的平均容量，推导出了LG光束螺旋谱的解析表达式.数值计算了FSO系统的平均容量，详细分析了指数参数、传输高度、结构常数、波长、外尺度和内尺度对平均容量的影响。结果表明，较小的结构常数、外尺度、较高的透射高度和较大的波长、内尺度都有利于不同程度地提高平均容量。所得结果在非Kolmogorov湍流环境下的光通信中具有潜在的应用价值。
The propagation of vortex beam in atmospheric turbulence is of significant importance in theoretical study and practical applications. Based on extended Huygens-Fresnel integral and the Rytov approximation, the average capacity of orbital angular momentum (OAM)-multiplexed Laguerre-Gaussian (LG) beam propagating through non-Kolmogorov turbulence is presented, and the analytical expression of spiral spectrum of LG beam has been deduced. The average capacity of FSO system is numerically calculated and the influence of exponent parameter, transmission height, structure constant, wavelength, outer scale and inner scale on average capacity are also analyzed in detail. Outcomes show that smaller structure constant, outer scale, higher transmission height and larger wavelength, inner scale are conducive to improve average capacity in different extent. Results acquires in this paper have potential application value in optical communication within non-Kolmogorov turbulence.