海洋湍流中部分相干艾里光-少模光纤耦合效率

Coupling Efficiency of Partially Coherent Airy Beam-Few Mode Fiber Under Oceanic Turbulence

部分相干艾里光束的自聚焦特性可有效抑制海洋湍流对空间光与光纤耦合性能造成负面影响。根据广义Huygens-Fresnel原理和部分相干光交叉谱密度函数,推导海洋湍流中部分相干艾里光束-少模(四模)光纤耦合效率的解析解。通过数值仿真分析光源参数、耦合参数,以及海洋湍流强度对耦合效率的影响。结果表明:耦合效率随着光源波长的增大、初始半径的增大、截断因子的增大,以及相干长度的减小而逐渐减小,随海洋湍流的增强逐渐减小;并在不同传输距离下,给出了最佳耦合参数,使得部分相干艾里光束与四模光纤的耦合达到最佳效果。

With the characteristics selffocusing,the partially coherent Airy beam can efficiently limit the adverse effects of ocean turbulence,which negatively affects the coupling performance of space light and fiber.In this paper,the generalized HuygensFresnel principle and the partial coherent optical crossspectral density function are used to derive the analytical expression of the coupling efficiency of partially coherent Airy beamfewmode(fourmode)fiber through ocean turbulence.The effects of light source parameters,coupling parameters and ocean turbulence intensity on coupling efficiency are numerically analyzed.The results show that the coupling efficiency gradually decreases with the increase of wavelength,initial radius,truncation factor and coherence length,and gradually decreases with the enhancement of ocean turbulence.At different transmission distances,the best coupling parameters are given,so that the coupling of partially coherent Airy beams and fourmode fibers achieves the best effect.