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传统光纤相比 ,光子晶体光纤芯区与包层之间具有更高的折射率差 ,并且制作过程中可以灵活地制造各种对称与非对称结构 ,这为在光子晶体光纤中实现高双折射提供了可能。应用全矢量模型分析一种折射率导模高双折射光子晶体光纤 ,其包层采用两种尺寸的空气孔 ,使该光纤具有二重旋转对称性 ,原来简并的两个正交偏振模不再简并 ,呈现出较高的双折射 ,模式双折射比普通的保偏光纤高至少一个量级。分析结果表明 ,在波长 15 4 0nm ,其拍长可达 0 .4 0 6 7mm。理论分析结果与实验测量结果相吻合。
Compared with traditional optical fiber, photonic crystal fiber core region and the cladding between the higher refractive index difference, and the manufacturing process can be flexibly to create a variety of symmetrical and asymmetric structure, which is in the photonic crystal fiber to achieve high birefringence Provided possible. Full-vector model is used to analyze a high-birefringence photonic crystal fiber with refractive index guided mode. The cladding uses two sizes of air holes to make the optical fiber have double rotational symmetry. The original degenerate two orthogonal polarization modes are not Degenerate, exhibit higher birefringence, and mode birefringence is at least one order of magnitude higher than conventional polarization-maintaining fibers. Analysis results show that the wavelength of 15 4 0nm, the beat length up to 0.4067mm. The theoretical analysis is consistent with the experimental results.