【摘要】：無線激光通信對(duì)比其他無線通信方式的獨(dú)特優(yōu)勢(shì)使人們對(duì)其越來越重視。數(shù)字微鏡器件是集成了幾十萬上百萬的微鏡單元的光調(diào)制器,能夠?qū)崿F(xiàn)幾十萬路光信號(hào)同時(shí)調(diào)制,滿足無線激光通信系統(tǒng)多信道同步調(diào)制傳輸需求,顯著提高系統(tǒng)效率,節(jié)約了經(jīng)濟(jì)成本,又能明顯提升系統(tǒng)性能。開展基于數(shù)字微鏡的無線激光通信系統(tǒng)研究順應(yīng)時(shí)代對(duì)通信技術(shù)提出的新的需求,具有重要經(jīng)濟(jì)及戰(zhàn)略意義。本論文針對(duì)基于數(shù)字微鏡無線激光通信系統(tǒng),從多方面闡述了無線激光通信系統(tǒng)結(jié)構(gòu)及原理;具體描述了半導(dǎo)體激光器激光輻射原理及特性,研究分析了大氣激光信道對(duì)激光束通信的影響因素,明確了大氣衰減系數(shù)對(duì)通信系統(tǒng)中光功率容限的影響,選定820nm波長半導(dǎo)體激光器為光源,設(shè)計(jì)了激光器控制驅(qū)動(dòng)電路及基于PIN光電管的激光信號(hào)接收檢測(cè)電路。對(duì)比分析了無線激光通信系統(tǒng)常用的OOK調(diào)制、PPM和DPIM調(diào)制方式的原理及性能;重點(diǎn)研究設(shè)計(jì)了基于FPGA的(m,3)MPPM調(diào)制解調(diào)模塊,分析了MPPM相關(guān)性能,驗(yàn)證了MPPM調(diào)制方式優(yōu)良的調(diào)制性能。研究了DMD內(nèi)部機(jī)械機(jī)構(gòu)及電氣連接,分析了DMD器件光調(diào)制的工作原理及流程,重點(diǎn)設(shè)計(jì)了FPGA為主控芯片的DMD驅(qū)動(dòng)控制系統(tǒng),實(shí)現(xiàn)了基于數(shù)字微鏡的無線激光通信系統(tǒng)樣機(jī)。室內(nèi)通信測(cè)試中采用示波器對(duì)系統(tǒng)通信的輸入信號(hào)、調(diào)制輸出信號(hào)、接收轉(zhuǎn)換信號(hào)、解調(diào)輸出信號(hào)采樣,結(jié)果表明系統(tǒng)能夠完成無線激光通信,驗(yàn)證了基于數(shù)字微鏡的無線激光通信系統(tǒng)方案可行,在提高無線激光通信系統(tǒng)通信容量和通信效率的道路上邁出了新的一步,為無線激光通信系統(tǒng)的發(fā)展提供了新的技術(shù)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.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN929.1

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