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在单模光纤的高斯近似理论基础上，针对平方律和阶跃型两种纤芯折射率分布情况，推导出各自所对应的模场半径表达式，并进行了相应的数值计算和图形表示，从而为应用光纤模场半径的相关知识进行理论计算及实际测试提供了可靠的依据。
Based on Gaussian approximation theory of single-mode optical fiber, the expression of the corresponding mode field radius is deduced according to the distribution of refractive index of both square-law and step-type. Corresponding numerical calculations and graphical representations are made. This provides a reliable basis for theoretical calculations and practical tests on the application of fiber mode field radius.