论文部分内容阅读
根据广义的Huygens-Fresnel原理和修正Von Karman谱模型,推导出了无线光通信(Free Space Optics,FSO)系统中相互独立的部分相干高斯-谢尔模型(Gaussian-Schell Model,GSM)阵列光束在大气湍流中传输时的光强分布、均方根束宽和桶中功率(Power in the bucket,PIB)解析式,并对不同因素影响下的自耦合特性、光束扩展和PIB进行了数值分析。结果表明:部分相干GSM阵列光束在大气传输过程中,当到达某一距离时多束光能合成一个平顶光束,再演变为高斯光束,且阵列光束在大气湍流中的自耦合特性比自由空间的要好;湍流外尺度对光强分布、光束扩展影响很小,可以忽略;部分相干GSM阵列光束与部分相干单GSM光束相比,具有更强的抑制湍流特性,有利于实现远距离通信。
Based on the generalized Huygens-Fresnel principle and the modified Von Karman spectrum model, we derive the independent, partially coherent Gaussian-Schell Model (GSM) array beams in the Free Space Optics (FSO) system The light intensity distribution, root mean square beam width and PIB (analytical solution of power in the bucket) in atmospheric turbulence are analyzed, and the self-coupling characteristics, beam expansion and PIB under the influence of different factors are numerically analyzed. The results show that when a partially coherent GSM array beam propagates in the atmosphere, the multi-beam light can combine into a flattened beam and then evolve into a Gaussian beam when it reaches a certain distance. The self-coupling characteristics of the array beam in atmospheric turbulence are better than those in free space The turbulence outer scale has little effect on the light intensity distribution and beam expansion, which can be neglected. Compared with some coherent single GSM beams, the partially coherent GSM array beams have stronger suppression turbulence characteristics and are conducive to long-distance communication.