【摘要】：空間光與光纖的耦合目前已經(jīng)在軍事上以及民用中的許多領(lǐng)域都得到廣泛應(yīng)用。這些應(yīng)用大多都在入射光與耦合系統(tǒng)距離很遠時,因此需要耦合的光束可以看做近似平行光,如空間光通信的接收系統(tǒng)；或者是光源與光纖距離非常近的情況,如內(nèi)窺鏡等醫(yī)學(xué)成像設(shè)備。但是目前將大范圍空間散射光有效地耦合到單模光纖中的研究還較少；當(dāng)被測物體較大時,光線就會從各個方向被物體反射出來,此時,耦合系統(tǒng)接收到的光線的角度較大。這種大范圍的空間散射光與單模光纖的耦合在許多領(lǐng)域都將能得到很好地應(yīng)用。 本文對目前常用的幾種直接耦合、單透鏡耦合(包括球透鏡、非球面鏡、柱面鏡、自聚焦透鏡和錐形光纖等方式)以及望遠鏡系統(tǒng)耦合方式進行比較,同時分析了入射光分別為近距離點光源和散射光時三種直接耦合和單透鏡耦合方式耦合效率的不同結(jié)果。確定了本文中大范圍空間散射光與單模光纖的有效耦合需要重點分析的幾種可能比較實用的耦合方式。通過仿真分析,發(fā)現(xiàn)一些現(xiàn)有的光纖耦合技術(shù),特別是單透鏡耦合,不適于將大范圍空間散射光耦合到單模光纖中。并且在最后著重分析了望遠鏡系統(tǒng)耦合方式。 耦合效率和接收視場是大范圍空間散射光耦合到單模光纖接收裝置的兩個重要的特性參數(shù),本文以這兩個參數(shù)為主要依據(jù),不但討論了影響光纖耦合效率的一些耦合因素,而且用點光源的徑向移動來模擬從不同方向入射的空間散射光,并通過理論分析和ZEMAX軟件仿真,對比光纖接收裝置的幾種透鏡耦合方式在整個耦合系統(tǒng)完全準(zhǔn)直時的耦合效率,以及在滿足一定的耦合效率時接收視場的大小。最后,通過實驗對重點分析的這幾種耦合方式的仿真內(nèi)容進行了驗證。
[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.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN253

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本文編號：2267286