本文選題：自由空間光通信　切入點(diǎn)：光纖耦合　出處：《西安理工大學(xué)》2016年博士論文　論文類型：學(xué)位論文

【摘要】：自由空間光通信(Free Space Optics,FSO)以帶寬高、無需頻譜許可和安裝方便等優(yōu)點(diǎn)受到了人們的廣泛關(guān)注,空間光耦合技術(shù)和光束控制技術(shù)是FSO通信光學(xué)系統(tǒng)的關(guān)鍵技術(shù)。本文針對(duì)上述兩種技術(shù)展開研究,主要工作如下:(1)在理想條件下,分析了空間平面波、高斯光束經(jīng)透鏡耦合進(jìn)單模光纖的耦合效率,并實(shí)驗(yàn)證明了耦合效率隨透鏡相對(duì)孔徑的變化過程中存在極值,為耦合結(jié)構(gòu)設(shè)計(jì)奠定理論基礎(chǔ)。(2)在湍流大氣條件下,利用Von Karman湍流譜平面波入射光場(chǎng)的互相關(guān)函數(shù)、交叉互相關(guān)函數(shù),建立了空間平面波經(jīng)單透鏡、透鏡陣列和馬克蘇托夫-卡塞格林望遠(yuǎn)系統(tǒng)(馬卡天線)耦合進(jìn)單模光纖的耦合效率、耦合光功率相對(duì)起伏方差的數(shù)學(xué)模型。分析了空間平面波經(jīng)不同光學(xué)結(jié)構(gòu)耦合進(jìn)單模光纖對(duì)耦合效率及耦合光功率抖動(dòng)方差的影響,實(shí)驗(yàn)驗(yàn)證了陣列接收和大口徑接收技術(shù)可以抑制湍流引起的耦合性能下降,為基于光纖耦合的FSO接收技術(shù)提供了實(shí)驗(yàn)依據(jù)。(3)研究了空間光耦合自動(dòng)對(duì)準(zhǔn)系統(tǒng)。對(duì)比模擬退火算法和粒子群算法,分析算法中相關(guān)參數(shù)對(duì)耦合自動(dòng)對(duì)準(zhǔn)系統(tǒng)的影響,為智能算法與空間光耦合自動(dòng)對(duì)準(zhǔn)技術(shù)的結(jié)合奠定理論基礎(chǔ)。(4)分析了陣列高斯光束在空間中傳輸?shù)淖择詈犀F(xiàn)象。提出了光纖高斯陣列光束環(huán)形排布離軸發(fā)射技術(shù),解決了馬卡天線次反射鏡對(duì)發(fā)射光束的遮擋問題,提高發(fā)射效率。為實(shí)現(xiàn)基于光纖的FSO發(fā)射技術(shù)提供了實(shí)驗(yàn)依據(jù)。(5)研制了基于馬卡系統(tǒng)的收發(fā)一體天線。實(shí)現(xiàn)了單模光纖發(fā)射和多模光纖接收的收發(fā)一體功能。本文的工作為實(shí)現(xiàn)FSO系統(tǒng)與光纖通信系統(tǒng)兼容提供了一種途徑,為陣列耦合接收技術(shù)和大口徑耦合技術(shù)在湍流大氣中的應(yīng)用奠定了理論基礎(chǔ)、提供了實(shí)驗(yàn)依據(jù)。
[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.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：TN929.1

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