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中文摘要：
传统有效折射率方法只能模拟具有相同空气孔大小的单包层光子晶体光纤.针对这一问题,提出了一种改进的有效折射率法,能够计算具有不同孔径的多包层光子晶体光纤的传输特性.并用此方法对三包层光子晶体光纤的基模有效折射率和色散等特性进行了数值模拟,结果与多极法模拟出的结果符合得很好.这种改进的有效折射率法拓展了传统有效折射率法的适用范围,对快速准确地分析和设计具有不同传输特性的多包层光子晶体光纤提供了理论依据.
英文摘要：
The conventional effective index method can only simulate the photonic crystal fibers with single cladding structure. To solve the problem,an improved effective index method is proposed in this paper. It calculates the propagation properties of multicladding photonic crystal fibers. The indices and total dispersions of the guided modes of three-cladding photonic crystal fibers are investigated by this method. The results agree closely with those of the muhipole method. Improved effective index method not only extends the application of conventional effective index method, but also provides theoretical support for analyzing and designing multi-cladding photonic crystal fibers with different propagation characteristics.
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