空间光-单模光纤耦合效率因素分析  

Technology of Coupling Beam into Single-Mode Fiber in Free Space Optical Communication System

作　　者：邓科[1] 王秉中[1] 王旭[1] 幺周石[1] 胡渝[1] 

机构地区：[1]电子科技大学物理电子学院,成都610054

出　　处：《电子科技大学学报》2007年第5期889-891,共3页Journal of University of Electronic Science and Technology of China

摘　　要：根据电磁场模场匹配理论,分析了影响空间光-单模光纤耦合效率的因素。通过优化耦合透镜相对孔径,可以实现较高效率的耦合。理论计算表明,当透镜相对孔径分别为0.203和0.211时,1310nm激光最大耦合效率为82.54%,1550nm激光最大耦合效率为82.69%。当对准出现偏差时,耦合效率下降,对准偏差与耦合效率关系曲线与光纤端面光场分布曲线相似,工程上可方便地加以计算。实验结果验证了理论分析方法和结果,测得最大耦合效率为61%。On the basis of field-matching theory, we analyzed the elements that affect the coupling efficiency of light from free space to single-mode fiber. If the F number of coupling lens is optimized, the coupling efficiency is adequate. Theoretical calculation indicates that the maximum coupling efficiencies of 82.54% and 82.69% in wavelength of I 310 nm and 1 550 nm are achieved when the F numbers of lens are 0.203 and 0.21 I, respectively. Aiming offset brings decline of coupling efficiency. The decline curve is similar to the field curve of fiber end, and it can be conveniently obtained in engineering calculation. Experimental results confirm the theory, and the measured maximum coupling efficiency is 61%.

关 键 词：空间光 耦合 自由空间光通信 单模光纤 

分 类 号：TN929.11[电子电信—通信与信息系统] O431.2[电子电信—信息与通信工程]