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基于超格子构造法 ,采用全矢量模型研究了具有中心缺陷孔的椭圆光子晶体光纤的传输特性 ,着重讨论了中心缺陷孔对光纤中基模的模场分布、双折射特性和色散特性的影响。研究表明 :与椭圆孔光子晶体光纤相比 ,由于中心椭圆缺陷孔的引入 ,使该光纤具有更高的模式双折射。光纤的传输特性对光纤的结构参量和波长具有较强的依赖关系 ,随着波长和中心缺陷孔的增加 ,双折射将增大 ,其模式双折射在 10 -3 量级。改变光纤的结构参量 ,可以获得超宽带的色散平坦或异常的色散特性。分析结果显示 ,当中心孔的尺寸dc/D =0 .4时 ,在波长 1.5 5 μm附近 ,可获得近 4 0 0nm的色散平坦区。
The transmission characteristics of elliptical photonic crystal fiber with center hole defects were investigated by full vector model based on hyperstrified construction method. The influence of central defect hole on the mode field distribution, birefringence and dispersion characteristics of the fundamental mode in the fiber was discussed emphatically. The results show that the optical fiber has a higher mode birefringence than the elliptical hole photonic crystal fiber due to the introduction of the center elliptical defect hole. The transmission characteristic of optical fiber has a strong dependence on the structural parameters and wavelength of the optical fiber. The birefringence will increase with the increase of the wavelength and the center defect hole, and the mode birefringence will be on the order of 10 -3. Changing the fiber’s structural parameters allows for the flattening or dispersion of ultra-wideband dispersions. The analysis results show that when the size of the center hole is dc / D = 0.4, a dispersion flat area of about 400 nm can be obtained at a wavelength of about 1.5 5 μm.