大范围空间散射光到单模光纤的耦合
发布时间：2018-10-12 19:12
【摘要】：空间光与光纤的耦合目前已经在军事上以及民用中的许多领域都得到广泛应用。这些应用大多都在入射光与耦合系统距离很远时,因此需要耦合的光束可以看做近似平行光,如空间光通信的接收系统；或者是光源与光纤距离非常近的情况,如内窥镜等医学成像设备。但是目前将大范围空间散射光有效地耦合到单模光纤中的研究还较少；当被测物体较大时,光线就会从各个方向被物体反射出来,此时,耦合系统接收到的光线的角度较大。这种大范围的空间散射光与单模光纤的耦合在许多领域都将能得到很好地应用。 本文对目前常用的几种直接耦合、单透镜耦合(包括球透镜、非球面镜、柱面镜、自聚焦透镜和锥形光纤等方式)以及望远镜系统耦合方式进行比较,同时分析了入射光分别为近距离点光源和散射光时三种直接耦合和单透镜耦合方式耦合效率的不同结果。确定了本文中大范围空间散射光与单模光纤的有效耦合需要重点分析的几种可能比较实用的耦合方式。通过仿真分析,发现一些现有的光纤耦合技术,特别是单透镜耦合,不适于将大范围空间散射光耦合到单模光纤中。并且在最后着重分析了望远镜系统耦合方式。 耦合效率和接收视场是大范围空间散射光耦合到单模光纤接收装置的两个重要的特性参数,本文以这两个参数为主要依据,不但讨论了影响光纤耦合效率的一些耦合因素,而且用点光源的径向移动来模拟从不同方向入射的空间散射光,并通过理论分析和ZEMAX软件仿真,对比光纤接收装置的几种透镜耦合方式在整个耦合系统完全准直时的耦合效率,以及在满足一定的耦合效率时接收视场的大小。最后,通过实验对重点分析的这几种耦合方式的仿真内容进行了验证。
[Abstract]:The coupling of space light and optical fiber has been widely used in military and civil fields. Most of these applications occur when the incident light is far from the coupling system, so the beam that needs coupling can be considered as approximately parallel light, such as a receiving system for space optical communication, or a very close relationship between the light source and the fiber. Medical imaging equipment such as endoscope. However, there is little research on coupling large range space scattering light to single mode fiber effectively. When the measured object is larger, the light will be reflected from various directions, in which case, the angle of light received by the coupling system is larger. The coupling of large range of spatial scattering light and single mode fiber will be well applied in many fields. In this paper, several kinds of direct coupling, single lens coupling (including spherical lens, non-spherical mirror, cylindrical mirror, self-focusing lens and tapered fiber) and the coupling mode of telescope system are compared. At the same time, the different results of coupling efficiency of three kinds of direct coupling and single lens coupling are analyzed when the incident light is a close range point light source and a scattering light source. Several possible practical coupling methods for the effective coupling of a large range of spatial scattering light and a single mode fiber are identified. Through simulation and analysis, it is found that some existing fiber coupling techniques, especially single lens coupling, are not suitable for coupling large range of spatial scattering light into single-mode optical fiber. Finally, the coupling mode of telescope system is analyzed. Coupling efficiency and receiving field of view are two important characteristic parameters of a large range of spatial scattering light coupled to a single mode optical fiber receiver. Based on these two parameters, some coupling factors affecting the coupling efficiency of optical fiber are discussed in this paper. Moreover, the radial movement of the point light source is used to simulate the spatial scattering light incident from different directions. Through theoretical analysis and ZEMAX software simulation, the coupling efficiency of several lens coupling modes of the optical fiber receiver is compared when the whole coupling system is collimated. And the size of the receiving field of view when the coupling efficiency is satisfied. Finally, the simulation contents of these coupling methods are verified by experiments.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN253
[Abstract]:The coupling of space light and optical fiber has been widely used in military and civil fields. Most of these applications occur when the incident light is far from the coupling system, so the beam that needs coupling can be considered as approximately parallel light, such as a receiving system for space optical communication, or a very close relationship between the light source and the fiber. Medical imaging equipment such as endoscope. However, there is little research on coupling large range space scattering light to single mode fiber effectively. When the measured object is larger, the light will be reflected from various directions, in which case, the angle of light received by the coupling system is larger. The coupling of large range of spatial scattering light and single mode fiber will be well applied in many fields. In this paper, several kinds of direct coupling, single lens coupling (including spherical lens, non-spherical mirror, cylindrical mirror, self-focusing lens and tapered fiber) and the coupling mode of telescope system are compared. At the same time, the different results of coupling efficiency of three kinds of direct coupling and single lens coupling are analyzed when the incident light is a close range point light source and a scattering light source. Several possible practical coupling methods for the effective coupling of a large range of spatial scattering light and a single mode fiber are identified. Through simulation and analysis, it is found that some existing fiber coupling techniques, especially single lens coupling, are not suitable for coupling large range of spatial scattering light into single-mode optical fiber. Finally, the coupling mode of telescope system is analyzed. Coupling efficiency and receiving field of view are two important characteristic parameters of a large range of spatial scattering light coupled to a single mode optical fiber receiver. Based on these two parameters, some coupling factors affecting the coupling efficiency of optical fiber are discussed in this paper. Moreover, the radial movement of the point light source is used to simulate the spatial scattering light incident from different directions. Through theoretical analysis and ZEMAX software simulation, the coupling efficiency of several lens coupling modes of the optical fiber receiver is compared when the whole coupling system is collimated. And the size of the receiving field of view when the coupling efficiency is satisfied. Finally, the simulation contents of these coupling methods are verified by experiments.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN253
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