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利用平面波展开法计算了圆六边形空气孔按三角形排列的光子晶体带隙,基于带隙图设计了移去7根玻璃毛细管形成纤芯、传输波长λ=1.55μm的空芯光子带隙光纤的结构参量。随后利用全矢量有限元法计算了所设计的在纤芯-包层交界面处引入石英环的光纤,给出了在不同半径情况下沿z轴方向的光强分布、光强等高线分布图和损耗随引入石英环相对厚度的变化曲线。得出了光纤消除表面模、减小损耗的纤芯外半径取值范围为1.55Λ~1.7Λ,石英环的相对厚度取值范围为1.3~1.5或3.4~3.8。通过分析发现石英环的引入既可以抑制表面模也可以激发表面模,抑制还是激发有赖于纤芯外半径和石英环厚度的选择。
The band gap of the photonic crystal with circular hexagonal air holes arrayed by triangles was calculated by using the plane wave expansion method. Based on the band gap diagram, a hollow fiber photonic band gap fiber with 7 glass capillary cores removed and transmission wavelength λ = 1.55 μm The structural parameters. Then the full-vector finite element method is used to calculate the optical fiber with quartz ring introduced at the core-cladding interface. The distribution of light intensity along the z-axis under different radii is given, Figure and loss with the introduction of quartz ring relative thickness curve. The results show that the outer radius of fiber core decreases from 1.55Λ to 1.7Λ and the relative thickness of quartz ring ranges from 1.3 to 1.5 or from 3.4 to 3.8. Through the analysis, it is found that the introduction of quartz ring can suppress both surface mode and surface mode, and the choice of suppression or excitation depends on core radius and quartz ring thickness.