By introducing the parameter "mode field radius" of WGMs, the mode separations calculated by mode field radius agree well with the experimental resu.

引入回音壁模式的“模场半径”概念，由“模场半径”计算出的模式间隔和实验测量值之间符合很好。

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Two methods and devices which are changeable aperture and movable aperture for measuring the mode-field radius of single-mode optical fibers are presented.

介绍两种快速测量单模光纤模场半径的方法及其测量装置——可变孔径法和移动圆孔法；

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Two methods and devices which are changeable aperture and movable aperture for measuring the mode-field radius of single-mode optical fibers are presented.

介绍两种快速测量单模光纤模场半径的方法及其测量装置——可变孔径法和移动圆孔法；

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