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提出了一种新型的方形分布渐变空气孔微结构光纤。借助时域有限差分法计算了孔间距取 2.0μm和2.5μm,最小孔直径分别取0.4μm、0.6μm、0.7μm、0.8μm和1.0μm,从第一层到第五层直径线性递增量分别为0.1μm/层和0.2μm/层的五层渐变空气孔微结构光纤的基模色散曲线图,结果表明渐变空气孔微结构光纤在控制色散的能力上明显优于空气孔不变的微结构光纤,这种光纤的色散曲线在1400~2000 nm波长范围内保持平坦且具有更低的色散量;当渐变空气孔微结构光纤第三层孔的直径取与孔直径不变微结构光纤的孔直径相同,且第一层到第五层孔直径按每层0.2μm的斜率增长时,其色散曲线最低最平坦,色散值保持在30 ps/(km·nm)左右。
A novel square distributed graded-air-hole microstructured fiber was proposed. Calculated by finite difference time-domain method, the distance between holes is 2.0μm and 2.5μm, and the minimum hole diameters are 0.4μm, 0.6μm, 0.7μm, 0.8μm and 1.0μm, respectively. The linear increment from the first layer to the fifth layer The results show that the graded-air-hole microstructured optical fiber is obviously better than the air-hole-like microstructure in the ability of controlling dispersion Optical fiber, the dispersion curve of the optical fiber is kept flat and has a lower dispersion in the wavelength range of 1400-2000 nm; when the diameter of the third layer of the hole of the graded-air-hole microstructure optical fiber is taken as the diameter of the hole of the microstructured optical fiber When the diameters of the first layer to the fifth layer increase at a slope of 0.2 μm per layer, the dispersion curve is the lowest and the most flat with dispersion values of about 30 ps / (km · nm).