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提出了一种复合六边形空气孔格点光子晶体光纤,其包层是由两种不同大小的空气孔组合而构成的。利用带有良匹配层(APML)吸收边界的全矢量频域有限差分法(FDFD)对其色散特性进行了数值分析。结果表明,通过调节包层中两种不同尺寸的空气孔的大小以及孔间距这三个参量,可以得到不同水平的平坦色散曲线,甚至超低超平坦的色散曲线。在孔间距Λ取2.1μm,小尺寸空气孔直径取0.5μm,大尺寸空气孔直径取0.8μm的条件下,在1.48~1.78μm的波长范围内得到了0±0.545 ps/(km.nm)的色散。
A composite hexagonal air-hole lattice photonic crystal fiber is proposed. Its cladding is composed of two kinds of air holes with different sizes. The full-color frequency-domain finite difference method (FDFD) with a well-matched layer (APML) absorption boundary was used to numerically analyze its dispersion characteristics. The results show that different levels of flat dispersion curves and even ultra-low and super-flat dispersion curves can be obtained by adjusting the sizes of the air holes of two different sizes in the cladding and the hole spacing. In the range of 1.48-1.78μm, the wavelength is 0.5 ± 0.545 ps / (km.nm) under the condition of the hole spacing Λ 2.1μm, the small size air hole diameter 0.5μm and the large size air hole diameter 0.8μm. Dispersion.