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.
环形光纤不同于普通光纤，它的内包层折射率比芯子和外包层都大。
Coaxial fibers are different from conventional fibers. The index of the inner cladding is higher than that of the core and outer cladding.
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