基于光纤的自由空间光通信与相干检测空间分集的性能分析

Performance analysis of fiber-based free-space optical communications with coherent detection spatial diversity.

作者信息

Li Kangning, Ma Jing, Tan Liying, Yu Siyuan, Zhai Chao

出版信息

Appl Opt. 2016 Jun 10;55(17):4649-56. doi: 10.1364/AO.55.004649.

DOI:10.1364/AO.55.004649

Abstract

The performances of fiber-based free-space optical (FSO) communications over gamma-gamma distributed turbulence are studied for multiple aperture receiver systems. The equal gain combining (EGC) technique is considered as a practical scheme to mitigate the atmospheric turbulence. Bit error rate (BER) performances for binary-phase-shift-keying-modulated coherent detection fiber-based free-space optical communications are derived and analyzed for EGC diversity receptions through an approximation method. To show the net diversity gain of a multiple aperture receiver system, BER performances of EGC are compared with a single monolithic aperture receiver system with the same total aperture area (same average total incident optical power on the aperture surface) for fiber-based free-space optical communications. The analytical results are verified by Monte Carlo simulations. System performances are also compared for EGC diversity coherent FSO communications with or without considering fiber-coupling efficiencies.

摘要

针对多孔径接收系统，研究了基于光纤的自由空间光（FSO）通信在伽马-伽马分布湍流中的性能。等增益合并（EGC）技术被视为一种减轻大气湍流的实用方案。通过一种近似方法，推导并分析了基于二进制相移键控调制相干检测的光纤自由空间光通信在EGC分集接收时的误码率（BER）性能。为了展示多孔径接收系统的净分集增益，将EGC的BER性能与基于光纤的自由空间光通信中具有相同总孔径面积（孔径表面上相同平均总入射光功率）的单个整体孔径接收系统进行了比较。分析结果通过蒙特卡罗模拟得到验证。还比较了考虑或不考虑光纤耦合效率的EGC分集相干FSO通信的系统性能。