用于大气相干激光通信的自适应光学应用基础研究

项目名称： 用于大气相干激光通信的自适应光学应用基础研究

项目编号： No.61308082

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 刘超

作者单位： 中国科学院光电技术研究所

项目金额： 25万元

中文摘要： 空间激光通信具有码率高、功耗低和保密性高等优点，是解决微波通信瓶颈、实现高速通信的有效手段。其中，相干激光通信因其具有接近散粒噪声极限的接收灵敏度、很强的抗噪声干扰性能，而备受青睐。然而，在大气通信链路中，相干激光通信遇到了困难。大气湍流引起传输激光光强、相位和传输方向随机变化，严重影响通信质量。抑制大气湍流的办法有多种，但在提高通信质量的同时，存在着各自的问题。在该背景下，本项目提出把自适应光学技术引入相干激光通信系统中，主动补偿大气湍流的随机扰动，恢复传输激光的相干性，以改善通信质量。项目将分别从理论分析、数值仿真和实验验证等方面，研究自适应光学改进大气相干激光通信效能的机理，研究在各种湍流条件下实现高质量通信的自适应光学系统设计方法。可以预见，通过本项目的深入研究，必将找到一种突破长距离、高码率大气激光通信技术瓶颈的途径，推动我国大气激光通信技术不断向前发展。

中文关键词： 自适应光学；激光通信；大气；；

英文摘要： Free-space laser communication is an attractive alternative to radio-frequency links for long-range and high-speed communication, for its wider communication bandwidth, smaller antenna size, lower power consume and higher security. The coherent laser communication is attractive as its receiver is very sensitive and is immune to the background noise. However, the coherent laser communication is helpless when it is used in the atmospheric communication links. The atmospheric turbulence distorts the intensity, wavefront and the propagation direction of the transmission laser, which degrades the communication performance. There are many methods that can be used to overcome the disturbance caused by the atmospheric turbulence. Howerver, all of the methods have their own disadvantages. Under the condition, we propose that the adaptive optics can be used in the coherent laser communication system. The adaptive optics can correct the distorted wavefront and the scintillation caused by the atmospheric turbulence. The coherent laser communication can work well as if there is no atmospheric turbulence in the communication links. Our work will be conducted using theory analysis, computer simulation and experiment validation. We will study the principle that the adaptive optics improves the performance of the coherent commun

英文关键词： adaptive optics；optical communicaitons；atmospheric turbulence；；