这种光纤的纤芯折射率比包层基质折射率小，所以短波长时基模损耗迅速增大，使得光传输截止。
The index of the core is a little smaller than that of the cladding base material, so the fundamental mode loss of short wavelength increases rapidly and leads to the mode cutoff.
研究了纤芯和内外包层都有手征的双包层手征光纤中的半漏模，发现双包层手征光纤中的半漏模特性与单包层手征光纤中的相比有很大不同。
It was discovered that the characteristics of semi-leaky modes in doubly clad chiral optical fibers are very different from those in single clad chiral optical fibers.
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.
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