基于数字微镜的无线激光通信系统研究

发布时间：2018-09-03 12:59

【摘要】：无线激光通信对比其他无线通信方式的独特优势使人们对其越来越重视。数字微镜器件是集成了几十万上百万的微镜单元的光调制器,能够实现几十万路光信号同时调制,满足无线激光通信系统多信道同步调制传输需求,显著提高系统效率,节约了经济成本,又能明显提升系统性能。开展基于数字微镜的无线激光通信系统研究顺应时代对通信技术提出的新的需求,具有重要经济及战略意义。本论文针对基于数字微镜无线激光通信系统,从多方面阐述了无线激光通信系统结构及原理;具体描述了半导体激光器激光辐射原理及特性,研究分析了大气激光信道对激光束通信的影响因素,明确了大气衰减系数对通信系统中光功率容限的影响,选定820nm波长半导体激光器为光源,设计了激光器控制驱动电路及基于PIN光电管的激光信号接收检测电路。对比分析了无线激光通信系统常用的OOK调制、PPM和DPIM调制方式的原理及性能;重点研究设计了基于FPGA的(m,3)MPPM调制解调模块,分析了MPPM相关性能,验证了MPPM调制方式优良的调制性能。研究了DMD内部机械机构及电气连接,分析了DMD器件光调制的工作原理及流程,重点设计了FPGA为主控芯片的DMD驱动控制系统,实现了基于数字微镜的无线激光通信系统样机。室内通信测试中采用示波器对系统通信的输入信号、调制输出信号、接收转换信号、解调输出信号采样,结果表明系统能够完成无线激光通信,验证了基于数字微镜的无线激光通信系统方案可行,在提高无线激光通信系统通信容量和通信效率的道路上迈出了新的一步,为无线激光通信系统的发展提供了新的技术方案。
[Abstract]:The unique advantages of wireless laser communication make people pay more and more attention to it. Digital micromirror device is an optical modulator which integrates hundreds of millions of micromirror units. It can realize the simultaneous modulation of hundreds of thousands of optical signals, meet the needs of multi-channel synchronous modulation and transmission in wireless laser communication system, and improve the system efficiency significantly. It saves economic cost and improves system performance obviously. The research of wireless laser communication system based on digital micromirror is of great economic and strategic significance. In this paper, the structure and principle of wireless laser communication system based on digital micromirror are described, and the laser radiation principle and characteristics of semiconductor laser are described in detail. The influence factors of atmospheric laser channel on laser beam communication are studied and analyzed. The influence of atmospheric attenuation coefficient on optical power tolerance in communication system is clarified. The 820nm wavelength semiconductor laser is selected as the light source. The laser control drive circuit and the laser signal receiving and detecting circuit based on PIN photodiode are designed. The principle and performance of OOK modulation and DPIM modulation in wireless laser communication system are compared and analyzed, and the (mt3) MPPM modulation and demodulation module based on FPGA is studied and designed. The correlation performance of MPPM is analyzed, and the excellent modulation performance of MPPM modulation is verified. The internal mechanical mechanism and electrical connection of DMD are studied. The working principle and flow chart of optical modulation of DMD devices are analyzed. The DMD drive and control system with FPGA as the main control chip is designed, and the wireless laser communication system prototype based on digital micromirror is realized. In the indoor communication test, the input signal of the system is modulated by oscilloscope, the output signal is modulated, the conversion signal is received, and the output signal is demodulated and sampled. The results show that the system can complete the wireless laser communication. It is proved that the scheme of wireless laser communication system based on digital micromirror is feasible. It takes a new step in improving the communication capacity and communication efficiency of wireless laser communication system, and provides a new technical scheme for the development of wireless laser communication system.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.1

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