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应用全矢量模型分析类矩形芯光子晶体光纤的色散和偏振特性 ,讨论了光纤结构参数对光纤特性的影响 .研究表明 :类矩形芯光子晶体光纤的模式双折射比普通椭圆保偏光纤至少高一个数量级 .增大光纤的相对孔径 ,可获得更高的双折射 .零走离点对应的波长也比普通椭圆保偏光纤长 ,随着孔距的增大 ,走离曲线将向长波长方向产生移位 ,零走离点发生红移 ,零走离点所对应的波长与孔距成正比 .零走离点的出现 ,将有效地抑制一阶偏振模色散 .通过调整光纤的结构参数 ,可以获得灵活的色散特性 ,在孔距Λ =2 μm ,相对孔径d Λ =0 3时 ,在波长 1 5 5 μm附近 ,获得近 4 0 0nm的超平坦色散区 .该光纤在偏振控制、色散控制和管理方面具有广泛的应用前景 .
The full-vector model is used to analyze the dispersion and polarization characteristics of the quasi-rectangular core photonic crystal fiber, and the influence of the fiber structure parameters on the fiber characteristics is discussed. The results show that the mode birefringence of the quasi-rectangular core photonic crystal fiber is at least one Order of magnitude.When increasing the relative aperture of the fiber, higher birefringence can be obtained.The wavelength corresponding to the zero-walking point is also longer than that of the ordinary elliptical polarization-maintaining fiber, and the deviation curve will shift to the long wavelength direction with the increase of the pitch Bit, the red shift away from zero point, zero away from the point corresponding to the wavelength and pitch is proportional to zero out of the point of appearance, will effectively suppress the first order polarization mode dispersion by adjusting the fiber structure parameters can be obtained Flexible dispersion characteristics, the near-400 nm ultra-flat dispersion region is obtained at a wavelength of 15 5 μm at a pitch of Λ = 2 μm and a relative aperture of d Λ = 0 3. This fiber has excellent performance in polarization control, dispersion control and Management has a wide range of applications.