【摘要】：衛(wèi)星光通信具有獨(dú)特的優(yōu)于微波通信的特點(diǎn)，傳輸容量大，傳輸速率高，傳輸距離遠(yuǎn)，抗干擾能力強(qiáng),通信保密性好等，近年以來獲得了快速的發(fā)展。充分利用現(xiàn)有的成熟的光纖通信技術(shù)是無線光通信技術(shù)重要的發(fā)展條件，，與光纖通信充分的無縫連接，組成無線和有線的擴(kuò)展通信空間是無線通信的發(fā)展趨勢(shì)。衛(wèi)星光通信的研究中，空間光到單模光纖的耦合是衛(wèi)星光通信關(guān)鍵問題之一，本文意在研究聚焦系統(tǒng)系統(tǒng)對(duì)空間光到單模光纖耦合效率的影響，并針對(duì)自聚焦透鏡對(duì)空間光到單模光纖的耦合效率的影響進(jìn)行了研究。本文的主要研究工作有： 首先介紹了本課題研究的目的和意義，并論述了國內(nèi)外在單模光纖耦合方面的研究進(jìn)展和技術(shù)發(fā)展?fàn)顩r。闡述空間光到單模光纖耦合的理論模型，利用模式匹配理論推導(dǎo)單模光纖在理想狀況下耦合效率的表達(dá)式，并考慮非最優(yōu)耦合參數(shù)下當(dāng)光纖發(fā)生橫向偏移和軸向偏移時(shí)單模光纖耦合效率的變化，聚焦系統(tǒng)耦合參小于最優(yōu)耦合參數(shù)時(shí)，系統(tǒng)對(duì)光纖偏移的容忍性好，并通過光學(xué)仿真驗(yàn)證了理論分析的正確性。 其次隨機(jī)角抖動(dòng)條件下單模光纖耦合效率變化情況，考慮在最優(yōu)耦合參數(shù)下，單模光纖耦合效率隨橫向偏移歸一化標(biāo)準(zhǔn)差的變化，并考慮當(dāng)耦合參數(shù)變化時(shí)，單模光纖耦合效率隨橫向偏移歸一化標(biāo)準(zhǔn)差的變化，聚焦系統(tǒng)的耦合參數(shù)小于最優(yōu)耦合參數(shù)時(shí)，系統(tǒng)對(duì)抖動(dòng)的容忍性好，并分析考慮了影響單模光纖耦合效率的其他因素。 最后介紹變折射率透鏡的起源及發(fā)展，變折射率透鏡和普通透鏡的區(qū)別，并理論推導(dǎo)自聚焦透鏡的成像規(guī)律，光束經(jīng)過自聚焦透鏡的成像特性可以通過控制改變自聚焦透鏡的長度和直徑來實(shí)現(xiàn)。根據(jù)理論分析進(jìn)行自聚焦透鏡條件下單模光纖耦合的實(shí)驗(yàn)研究，分析自聚焦透鏡條件下空間光到單模光纖耦合的特征，自聚焦透鏡對(duì)光束偏差的容忍性好。 本文的研究工作對(duì)衛(wèi)星光通信中空間光到單模光纖的耦合起到基礎(chǔ)性作用，為光通信系統(tǒng)的優(yōu)化設(shè)計(jì)提供理論和實(shí)驗(yàn)依據(jù)。
[Abstract]:Satellite optical communication has unique advantages over microwave communication, such as large transmission capacity, high transmission rate, long transmission distance, strong anti-interference ability, good communication confidentiality and so on, which has gained rapid development in recent years. Making full use of the existing mature optical fiber communication technology is an important condition for the development of wireless optical communication technology. It is the development trend of wireless communication to make up the wireless and wired extended communication space with sufficient seamless connection with optical fiber communication. In the research of satellite optical communication, the coupling between space light and single mode fiber is one of the key problems in satellite optical communication. This paper aims to study the effect of focusing system on coupling efficiency between space light and single mode optical fiber. The effect of self-focusing lens on coupling efficiency between space light and single mode fiber is studied. The main research work of this paper is as follows: firstly, the purpose and significance of this research are introduced, and the research progress and technical development of single-mode fiber coupling at home and abroad are discussed. The theoretical model of coupling between space light and single mode fiber is described. The expression of coupling efficiency of single mode fiber under ideal condition is derived by mode matching theory. Considering the variation of the coupling efficiency of single-mode fiber when the transverse and axial shifts occur under the non-optimal coupling parameters, the system has good tolerance to the fiber offset when the coupling parameter of the focusing system is less than the optimal coupling parameter. The correctness of the theoretical analysis is verified by optical simulation. Secondly, under random angle jitter, the coupling efficiency of single-mode fiber is changed under the optimal coupling parameters, and the variation of the coupling efficiency with the normalized standard deviation of transverse deviation is considered, and when the coupling parameter changes, the coupling efficiency of the single mode fiber is considered when the coupling parameter is changed. When the coupling parameter of the focusing system is smaller than the optimal coupling parameter, the system has good tolerance to the jitter, and other factors affecting the coupling efficiency of the single-mode fiber are analyzed. Finally, the origin and development of variable-index lens and the difference between variable-index lens and ordinary lens are introduced, and the imaging law of self-focusing lens is deduced theoretically. The imaging characteristics of a beam passing through a self-focusing lens can be achieved by controlling the length and diameter of the self-focusing lens. According to the theoretical analysis, the experimental study of single-mode fiber coupling under the condition of self-focusing lens is carried out. The characteristics of the coupling between spatial light and single-mode fiber under the condition of self-focusing lens are analyzed. The self-focusing lens has good tolerance to beam deviation. The research work in this paper plays a fundamental role in the coupling between space light and single mode optical fiber in satellite optical communication, and provides theoretical and experimental basis for the optimal design of optical communication system.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.11

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本文編號(hào)：2174404