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利用全矢量有限元法计算和分析了基于正方形格子的空芯光子带隙光纤的模式特性和泄漏损耗.通过分析发现,圆正方形空气孔按正方形格子排列的空芯光子带隙光纤可以实现宽带和有效的单模运转.随后对正方形格子空芯光子带隙光纤的泄漏损耗进行了全面分析,通过分析发现纤芯直径和包层空气孔间距的变化对泄漏损耗的影响较小,但可以通过调节包层空气孔间距来实现给定的波长具有最小的泄露损耗;圆化直径对泄漏损耗的影响较前两个因素要大,且存在一个最佳的圆化直径即dc/d=0.4;包层空气孔的层数是影响泄漏损耗的主要因素,每增加两层空气孔泄漏损耗大约会降低两个数量级.
The full-vector finite element method was used to calculate and analyze the mode characteristics and leakage loss of hollow-core photonic band-gap fibers based on a square lattice.It was found through analysis that hollow-core photonic bandgap fibers with square holes arranged in a square lattice could achieve broadband and Effective single-mode operation.Furthermore, the leakage loss of the square lattice hollow core photonic band gap fiber is analyzed comprehensively. It is found that the variation of the core diameter and the spacing of the cladding air holes has little influence on the leakage loss. However, Cladding air hole spacing to achieve a given wavelength with the least leakage loss; rounding diameter of the leakage loss than the previous two factors to be larger, and there is an optimal round diameter that dc / d = 0.4; package The number of layers of air holes is the main factor that affects the leakage loss, and the leakage loss of each layer of air holes is reduced by about two orders of magnitude.