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采用矢量有限元法分析和设计了一种新型的层状微结构光子晶体光纤.通过数值模拟纤芯基模的有效折射率neff和包层空间填充基模有效折射率ncld,获得这种微结构光纤的模式截止特性.与传统光子晶体光纤相比,这种微结构光纤单模和多模的边界条件在获得无截止单模传输前提下,具有更大的空气孔尺寸和非线性效应,有更高的灵活性,可以保持更短的单模截止波长,获得较高的非线性系数.
A new type of layered microstructured photonic crystal fiber is analyzed and designed by using the vector finite element method. This microstructure is obtained by numerical simulation of the effective refractive index neff of the fundamental core mode and the effective refractive index ncld of the cladding mode filled in the cladding space Compared with the traditional photonic crystal fiber, the single-mode and multi-mode boundary conditions of this kind of microstructured optical fiber have larger air-hole size and non-linearity effect under the condition of obtaining non-stop single-mode transmission. More flexibility, you can keep a shorter single-mode cutoff wavelength, to obtain a higher nonlinear coefficient.