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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.
According to the mode field distribution of TE01 mode fiber and the relationship between mode field radial spatial spectrum distribution and mode field distribution, the second-order moment field and radial space frequency radius of TE01 mode fiber with step index fiber are given. And the analytic function expression of the diffracted field beam transmission factor.The calculated results show that when the normalized frequency of the fiber is more than 2.797 4, the beam transmission factor of the TE01 mode diffractive field of the step index fiber is closer to 2. The polynomial fitting beam is used to transmit Factor and the normalized frequency of the optical fiber, the function expression of the relationship between the beam transmission factor and the normalized frequency of the optical fiber is given, and the precision of the fitted function expression is clarified based on the relative error between the fitted value and the calculated value Sex.