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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 characteristics of photonic bandgap photonic crystal fiber (PBG-PCF) with three kinds of defect morphology such as point defects outside the center defect, air column dislocation and inner air column deformation were simulated by finite-difference time-domain method (FDTD) .It is found that the appearance of defects leads to the flattening of the dispersion curve. On the other hand, the occurrence of point defects and dislocation defects will shift the zero-dispersion point to the long-wave, and the deformation of the inner air column will make the zero- Mobile.This will guide the actual production practice of PBG-PCF.