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基于带有各向异性完全匹配层吸收边界条件的紧凑二维频域有限差分法(2D-FDFD)对八角格子光子晶体光纤(O-PCF)的模式分布、模式截止特性以及色散特性进行了数值模拟。通过计算八角格子光子晶体光纤前20个模式分布发现,其模场形状比六角格子光子晶体光纤(H-PCF)的好,更接近于圆形;利用有效面积方法分析了八角格子和六角格子光子晶体光纤基模和二阶模的截止特性,得到了非限制模、基模和多模的相图。比较发现相同填充率和空气孔间距时,八角格子光子晶体光纤的单模运转区域要比六角格子光子晶体光纤的宽,且更易用于色散补偿。
The mode distribution, mode-cutoff characteristic and dispersion characteristic of octagonal lattice photonic crystal fiber (O-PCF) were numerically calculated based on the 2D-FDFD method with the absorption boundary condition of the perfectly matched layer with anisotropy simulation. By calculating the distribution of the first 20 modes of octagonal lattice photonic crystal fiber, the mode field shape is better than hexagonal lattice photonic crystal fiber (H-PCF) and closer to the circle. By using the effective area method, the octagonal lattice and hexagonal lattice photon Crystal fiber fundamental mode and the second-order mode of the cut-off characteristics, obtained unrestricted mode, fundamental mode and multimode phase diagram. Comparing the same filling rate with air hole spacing, the single-mode operating region of octagonal lattice photonic crystal fiber is wider than that of hexagonal lattice photonic crystal fiber and is more suitable for dispersion compensation.