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基于超格子构造法,采用全矢量模型研究具有中心缺陷孔的椭圆孔光子晶体光纤(EHPCF)的偏振特性。研究表明,与相同结构参量的椭圆孔光子晶体光纤相比,具有中心缺陷孔的椭圆孔光子晶体光纤具有更大的模式双折射和走离参数。双折射、走离参数与频率的依赖关系与普通保偏光纤存在很大差别。走离参数在低频区出现零走离点,这为在该光纤中既保持高双折射又实现零走离单模运转提供了可能。适量增加中心缺陷孔,包层椭圆孔的椭圆率及面积可以获得高的双折射和大的走离参数。
Based on the supergrid construction method, the full-vector model is used to study the polarization characteristics of elliptical hole photonic crystal fiber (EHPCF) with center-defect holes. The results show that the elliptical aperture photonic crystal fiber with central defect hole has larger mode birefringence and runaway parameters than the elliptical hole photonic crystal fiber with the same structural parameters. Birefringence, walk away from the parameters and the frequency dependence of ordinary polarization-maintaining fiber there is a big difference. Walk away from the parameters appear in the low-frequency zone to go zero point, which is in the fiber to maintain both high birefringence and to achieve zero-leave single-mode operation is possible. Moderate increase in the center hole defects, the elliptic aperture and area of the cladding elliptical hole can get high birefringence and large departure parameters.