Effect of defects outside the centre on dispersive properties of photonic band gap guiding photonic crystal fibers
中心外缺陷对带隙型光子晶体光纤色散特性的影响

The dispersion properties of optical wave in photonic band gap guiding photonic crystal fibers (PBG-PCF) were analyzed by the finite differential time domain method. The result demonstrates that: the point defects and the dislocation of air holes make the zero-dispersion-point move to the long-wavelength side, but the change of the shape of the air columm makes it move in the opposite direction. All kinds of defects make the dispersion curves flatten.