中心外缺陷对带隙型光子晶体光纤色散特性的影响

Effect of defects outside the centre on dispersive properties of photonic band gap guiding photonic crystal fibers

利用时域有限差分法(FDTD)模拟仿真了在中心缺陷外出现点缺陷、空气柱位错和内层空气柱发生形变三种缺陷形态对光子带隙型光子晶体光纤(PBG-PCF)色散特性的影响.发现一方面缺陷的出现会使色散曲线趋于平坦,另一方面点缺陷和位错缺陷的出现会使零色散点向长波移动,内层空气柱的形变使零色散点向短波长移动.这对PBG-PCF的实际生产实践会有指导意义.

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.