阶跃折射率光纤TE_(01)模衍射场的光束传输因子  

The Beam Propagation Factor in Diffracted Field of TE_(01) Mode in Step Index Fiber

作　　者：张振[1] 李连煌[1] 郭福源[1] 

机构地区：[1]福建师范大学激光与光电子技术研究所,光子技术福建省重点实验室,医学光电科学与技术教育部重点实验室,福建福州350007

出　　处：《福建师范大学学报（自然科学版）》2013年第4期53-56,72,共5页Journal of Fujian Normal University：Natural Science Edition

基　　金：福建省教育厅重点资助项目(JA10062;K2012007)

摘　　要：根据阶跃折射率光纤TE01模的模场分布及模场径向空间频谱分布与模场分布的关系,给出了阶跃折射率光纤TE01模的二阶矩模场半径和径向空间频率半径以及衍射场光束传输因子的解析函数表达式.计算表明,当光纤归一化频率大于2.797 4时,阶跃折射率光纤TE01模衍射场的光束传输因子较接近于2.采用多项式拟合光束传输因子与光纤归一化频率的关系,给出了光束传输因子与光纤归一化频率关系的函数表达式,并基于拟合值和计算值之间的相对误差阐明了拟合函数表达式的精确性.Based on the mode field distributions and the relationship between the radial spatial spectrum and the mode field distributions of the TE01 mode in step index fiber, the expressions of the mode field radius and the radial spatial frequency radius by second moment algorithm and the beam propagation factor of diffracted field are derived. Numerical calculation shows that the beam propagation factor of the TE01 mode is close to 2 when the normalized frequency is greater than 2. 797 4. The fitting expression between the beam propagation factor and the normalized frequency is given by curve fitting, the accuracy of fitting expression is show by the relative error between the fitted value and the calculated value.

关 键 词：模场半径 空间频谱 光束传输因子 归一化频率 

分 类 号：TN012[电子电信—物理电子学] O436.1[机械工程—光学工程]