平坦色散低限制损耗光子晶体光纤的设计

Design of photonic crystal fiber with flat dispersion and low confinement loss

为了得到一种新的具有低限制损耗和平坦色散的光子晶体光纤,设计了具有6层空气孔的正八边形结构,将包层分布为3种不同空气孔直径d_1,d_2,d_3,采用多极法数值模拟了这些结构参量对其色散特性和限制损耗的影响。得到在1.3μm～1.72μm波长范围内,光纤的色散系数介于-0.1ps/(km·nm)～0.58ps/(km·nm)之间,在波长1.55μm处的限制损耗达到了0.16dB/km的平坦色散低限制损耗光子晶体光纤。结果表明,特殊的八边形结构比较适合用于平坦色散低限制损耗光子晶体光纤的研究。这一结果对于光子晶体光纤在光通信的应用是有帮助的。

In order to obtain a new flat dispersion photonic crystal fiber with low confinement loss, six octagonal rings of air holes in different diameters of d1 , d2 and d3 were designed in the cladding of the fiber. Effect of the structure parameters on the dispersion and confinement loss was simulated by means of multi-pole method. The results show that the dispersion is among -0. 1ps/（km· nm） - 0. 58 ps/（km·nm） in the wavelength range of 1.3μm to 1.72μm . The confinement loss is 0. 16dB/km at 1.55μm. So the special octagonal structure is more suitable for photonic crystal fibers with flat dispersion and low confinement loss. The results are useful for application of photonic crystal fibers in the optical communication.