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采用平面波展开法(PWM)研究了基于三角晶格、复合蜂窝晶格和改进的复合蜂窝晶格光子晶体光纤(PCF)的包层中不同层气孔和掺杂介质柱尺寸对光纤带隙的影响。结果表明,在第m层(m=1,2,3)空气孔直径改变同样大小的情况下,随着m的增大,第m层空气孔尺寸的变化对带隙的影响越来越小;通过改进光纤结构中介质柱的排列,或掺杂折射率比较大的介质,可以有效地调节或增宽光子带隙(PBG),具有改进的复合蜂窝晶格结构的光子晶体光纤可实现更宽的带隙分布。
The effect of different layers of pores and doping medium on the band gap of optical fiber was studied by the plane wave expansion method (PWM) in the cladding of the triangular lattice, the composite honeycomb lattice and the improved composite honeycomb lattice photonic crystal fiber (PCF) . The results show that with the increase of m, the influence of the change of air hole size on the band gap becomes smaller with the increase of m in the m-th layer (m = 1, 2, 3) ; Photonic bandgap (PBG) can be effectively tuned or broadened by improving the arrangement of dielectric columns in the fiber structure or by doping with a medium of relatively high index of refraction. Photonic crystal fibers with an improved composite honeycomb lattice structure can be more Wide band gap distribution.