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介绍了一种双芯复合格点负色散光子晶体光纤,其包层是由连续电介质纯硅背景上挖出的两种大小不同的空气孔构成,芯区是由掺锗的高折射率的材料构成。为了实现负色散,还移去了包层中的一圈空气孔。采用频域有限差分法对其负色散特性进行分析表明,通过调整空气孔间距和两种空气孔的尺寸,可以得到不同程度的宽带负色散。当内芯半径取0.95μm,孔间距取2.15μm,大空气孔直径取1.9μm,小空气孔直径取1.1μm时,可在1.55μm处实现宽带负色散,其半峰全宽超过了200 nm。这种光纤的包层中空气孔呈六边形分布,空气孔的尺寸均大于1μm,降低了制作的难度。这种光纤可以用于波分复用光纤通信系统中的宽带色散补偿。
A double-core composite lattice negative dispersion photonic crystal fiber is introduced. The cladding is composed of two air holes of different sizes excavated on a continuous dielectric silicon background. The core is made of germanium doped high refractive index material constitute. In order to achieve negative dispersion, also removed the circle of air holes in the cladding. Finite-difference (FD) method is used to analyze its negative dispersion characteristics. It shows that wideband negative chromatic dispersion can be obtained by adjusting the air hole spacing and the size of the two air holes. When the inner core radius is 0.95μm, the hole spacing is 2.15μm, the large air hole diameter is 1.9μm and the small air hole diameter is 1.1μm, broadband negative dispersion can be realized at 1.55μm with the full width at half maximum of more than 200 nm . The air holes in the cladding of the optical fiber are distributed in a hexagonal shape with air holes larger than 1 μm in size, which reduces the difficulty of manufacture. This kind of optical fiber can be used for broadband dispersion compensation in WDM optical fiber communication system.