光纤耦合效率与接收光强计算研究  

Research on coupling factor and receiving power of optical fiber

作　　者：王宇华[1] 李志华[2] 段发阶[2] 叶声华[2] 

机构地区：[1]佛山科学技术学院机电系,广东佛山528000 [2]天津大学精密测试技术及仪器国家重点实验室,天津300072

出　　处：《光电工程》2005年第7期42-44,58,共4页Opto-Electronic Engineering

基　　金：国家自然科学基金(50375110);广东省自然科学基金(034067)资助项目

摘　　要：由于用近似方法计算出的光纤耦合效率和接收光功率与实验测量之间存在差异,有必要探讨更准确的计算方法以满足应用的需要。通过对径向变量的积分,导出了在高斯光强分布下对接收光纤端面进行面积分计算的一元积分式,从而可以快速准确地对光纤的耦合效率和接收光功率进行数值计算。对62.5/125多模光纤的耦合效率和接收光功率进行的数值计算和实验测量说明,光纤的耦合效率只有用准确的数值计算才能给出与实际相符合的计算结果。使用芯径较大的接收光纤测量出射光束的近场光强分布时,光纤接收光强分布较光束的光强分布有较大的展宽,其相对误差甚至可达60%。Since there are some differences between the coupling factor and receiving power of optical fiber calculated by approximate method and the measurements from experiments, it is necessary to investigate a more accurate calculating method to meet the need of practical application. Double integral of Gaussian beam over the receiving optical fiber surface can be simplified to a one dimension integrating formula by integrating the radial variable, which can improve numerical calculating speed and accuracy for evaluating the coupling factor and receiving power of optical fiber. The results of numerical calculation and measurements of the 62.5/125 multimode optical fiber show that only accurate numerical calculation result of the integral of Gaussian beam over the receiving fiber surface can accord with the measurements. When using the receiving fiber with larger core diameter to measure the light intensity distribution of Gaussian beam, the power distribution collected by the receiving fiber is wider than actual intensity distribution of the beam, and the relative error may be even greater than 60%.

关 键 词：光纤耦合 光纤传感器 耦合效率 接收光强 高斯光束 

分 类 号：TN253[电子电信—物理电子学]