聚焦系统对单模光纤空间光耦合影响分析
发布时间：2018-08-09 14:41
【摘要】：卫星光通信具有独特的优于微波通信的特点，传输容量大，传输速率高，传输距离远，抗干扰能力强,通信保密性好等，近年以来获得了快速的发展。充分利用现有的成熟的光纤通信技术是无线光通信技术重要的发展条件，，与光纤通信充分的无缝连接，组成无线和有线的扩展通信空间是无线通信的发展趋势。卫星光通信的研究中，空间光到单模光纤的耦合是卫星光通信关键问题之一，本文意在研究聚焦系统系统对空间光到单模光纤耦合效率的影响，并针对自聚焦透镜对空间光到单模光纤的耦合效率的影响进行了研究。本文的主要研究工作有： 首先介绍了本课题研究的目的和意义，并论述了国内外在单模光纤耦合方面的研究进展和技术发展状况。阐述空间光到单模光纤耦合的理论模型，利用模式匹配理论推导单模光纤在理想状况下耦合效率的表达式，并考虑非最优耦合参数下当光纤发生横向偏移和轴向偏移时单模光纤耦合效率的变化，聚焦系统耦合参小于最优耦合参数时，系统对光纤偏移的容忍性好，并通过光学仿真验证了理论分析的正确性。 其次随机角抖动条件下单模光纤耦合效率变化情况，考虑在最优耦合参数下，单模光纤耦合效率随横向偏移归一化标准差的变化，并考虑当耦合参数变化时，单模光纤耦合效率随横向偏移归一化标准差的变化，聚焦系统的耦合参数小于最优耦合参数时，系统对抖动的容忍性好，并分析考虑了影响单模光纤耦合效率的其他因素。 最后介绍变折射率透镜的起源及发展，变折射率透镜和普通透镜的区别，并理论推导自聚焦透镜的成像规律，光束经过自聚焦透镜的成像特性可以通过控制改变自聚焦透镜的长度和直径来实现。根据理论分析进行自聚焦透镜条件下单模光纤耦合的实验研究，分析自聚焦透镜条件下空间光到单模光纤耦合的特征，自聚焦透镜对光束偏差的容忍性好。 本文的研究工作对卫星光通信中空间光到单模光纤的耦合起到基础性作用，为光通信系统的优化设计提供理论和实验依据。
[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.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.11
本文编号：2174404
[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.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.11
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