单模光纤端面衍射光束参量与其结构参数关系研究

本文采用指数函数拟合光纤基模端面衍射场光束参量与光纤基本参数的关系，分别得到了各个光束参量与光纤归一化频率V和光纤芯层半径a关系的解析表达式。把曲线拟合得到的基于V和a表达的解析函数的计算结果，与基于光纤芯层参量U、包层衰减参量W和光纤芯层半径a表达的解析函数的计算结果相比，当1.5

Relationship Between Beam Parameters and Structure Parameters of Single Mode Fiber

The exponential function is used to fit the curves between the beam parameters in the diffractive field of LP01 mode fiber end surface and the basic parameters of fiber. The fitting function between mode field radius in the near field, angular radius of far field divergence, beam propagation factor and the normalized frequency with the core layer radius are obtained respectively. The computed results from the fitting functions are very close to that from the analytical functions, when 1.5 %V% 9.4, the maximal relative error is smaller than 2%. In a certain degree, these conclusions will provide academic foundation for analyzing or calculating the beam parameters approximately.