自由空间光通信中的光耦合及光束控制技术研究

发布时间：2018-03-07 07:01

本文选题：自由空间光通信　切入点：光纤耦合　出处：《西安理工大学》2016年博士论文　论文类型：学位论文

【摘要】：自由空间光通信(Free Space Optics,FSO)以带宽高、无需频谱许可和安装方便等优点受到了人们的广泛关注,空间光耦合技术和光束控制技术是FSO通信光学系统的关键技术。本文针对上述两种技术展开研究,主要工作如下:(1)在理想条件下,分析了空间平面波、高斯光束经透镜耦合进单模光纤的耦合效率,并实验证明了耦合效率随透镜相对孔径的变化过程中存在极值,为耦合结构设计奠定理论基础。(2)在湍流大气条件下,利用Von Karman湍流谱平面波入射光场的互相关函数、交叉互相关函数,建立了空间平面波经单透镜、透镜阵列和马克苏托夫-卡塞格林望远系统(马卡天线)耦合进单模光纤的耦合效率、耦合光功率相对起伏方差的数学模型。分析了空间平面波经不同光学结构耦合进单模光纤对耦合效率及耦合光功率抖动方差的影响,实验验证了阵列接收和大口径接收技术可以抑制湍流引起的耦合性能下降,为基于光纤耦合的FSO接收技术提供了实验依据。(3)研究了空间光耦合自动对准系统。对比模拟退火算法和粒子群算法,分析算法中相关参数对耦合自动对准系统的影响,为智能算法与空间光耦合自动对准技术的结合奠定理论基础。(4)分析了阵列高斯光束在空间中传输的自耦合现象。提出了光纤高斯阵列光束环形排布离轴发射技术,解决了马卡天线次反射镜对发射光束的遮挡问题,提高发射效率。为实现基于光纤的FSO发射技术提供了实验依据。(5)研制了基于马卡系统的收发一体天线。实现了单模光纤发射和多模光纤接收的收发一体功能。本文的工作为实现FSO系统与光纤通信系统兼容提供了一种途径,为阵列耦合接收技术和大口径耦合技术在湍流大气中的应用奠定了理论基础、提供了实验依据。
[Abstract]:Free Space optical communication (FSO) has attracted wide attention due to its advantages of high bandwidth, no spectrum permission and easy installation. Space-light coupling technology and beam control technology are the key technologies of FSO communication optical system. The main work of this paper is as follows: 1) under ideal conditions, the space plane wave is analyzed. The coupling efficiency of Gao Si beam coupled into a single mode optical fiber through a lens is proved by experiments. It is proved that the coupling efficiency varies with the relative aperture of the lens, which lays a theoretical foundation for the design of the coupling structure in turbulent atmosphere. By using the cross correlation function and cross correlation function of the incident light field of the Von Karman turbulent plane wave, a single lens of the plane wave passing through the space is established. The coupling efficiency of a lens array and a Maxutov-Cassegrain Lookout system (Maka Antenna) coupled to a single-mode optical fiber, The mathematical model of relative fluctuation variance of coupled optical power is established. The effects of space plane wave coupled into single-mode fiber with different optical structures on coupling efficiency and dithering variance of coupled optical power are analyzed. The experimental results show that array reception and large aperture reception can restrain the coupling performance degradation caused by turbulence. This paper provides experimental basis for FSO receiving technology based on fiber coupling, and studies the spatial optical coupling automatic alignment system. Compared with simulated annealing algorithm and particle swarm optimization algorithm, the influence of relevant parameters in the algorithm on coupled automatic alignment system is analyzed. This paper provides a theoretical basis for the combination of intelligent algorithm and spatial light coupling automatic alignment technology. The self-coupling phenomenon of array Gao Si beam propagating in space is analyzed. The problem of shielding the emitting beam from the secondary mirror of the Maka antenna is solved. In order to provide experimental basis for FSO transmission technology based on optical fiber, a transceiver antenna based on Ma card system is developed. The function of single mode fiber transmission and multimode fiber receiving is realized. The work of this paper provides a way to realize the compatibility between FSO system and optical fiber communication system. It lays a theoretical foundation for the application of array coupled receiving technology and large aperture coupling technology in turbulent atmosphere and provides the experimental basis.
【学位授予单位】：西安理工大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：TN929.1

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