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介绍了一种双芯复合正方形格点负色散光子晶体光纤,其包层是在纯硅背景上分布着两种大小不同的按正方形格点排列的空气孔,芯区是由掺杂的高折射率材料构成.为了实现负色散,移去了包层中第三层空气孔.采用频域有限差分法对其负色散特性进行的分析表明,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,空气孔间距取2.05μm,大小空气孔直径分别取1.9μm、1.2μm时,可在1.55μm处实现宽带负色散,其半峰全宽超过了200nm.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 square lattice negative-dispersion photonic crystal fiber is introduced. The cladding consists of two kinds of air holes arranged in a square grid with different sizes distributed on a pure silicon background. The core area is composed of doped high refraction Rate material composition.In order to achieve the negative dispersion, remove the third layer of air holes in the cladding.The finite-difference method of frequency domain analysis of its negative dispersion characteristics show that by adjusting the air hole spacing and the size of the two air holes, Can get different degrees of broadband negative chromatic dispersion.When the inner core radius of 0.95μm, air hole spacing of 2.05μm, the size of the air hole diameter were 1.9μm, 1.2μm, the wideband negative dispersion can be achieved at 1.55μm, the half-peak The full-width exceeds 200 nm. This fiber can be used for wideband dispersion compensation in WDM optical fiber communication systems.