采用模场耦合理论，推导出多模光纤与单模光纤的直接耦合效率表达式，计算得到耦合效率与所选用的多模光纤和单模光纤的纤芯芯径之间的模拟关系。
Based on mode field coupling theory, a model to calculate the butt-joint coupling efficiency between a multi-mode fiber and a single-mode fiber is presented.
玻璃纤维芯有两种基本的类型：多模光纤，用于10 km以下的距离；单模光纤，用于更长的距离。
The glass fiber core comes in one of two basic types: multimode fiber for distances up to 10km and single-mode fiber for longer distances.
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