【摘要】 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。更多还原

【Abstract】 The expression of the mode field radius was educed for square law and step index fiber based on the Gauss approximated theory of the single mode fiber, and the reciprocal numerical calculation and graph express was achieved. Which provided reliable foundation for theoretical analysis and practical test of the mode field radius of the fiber.更多还原