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设计了一种具有高双折射和高负色散特性的光子晶体光纤。在包层中,采用压缩三角格子和两种不同大小椭圆空气孔。基于超格子构造法,研究了光子晶体光纤的结构参数对双折射特性和色散特性的影响。数值研究结果表明:双折射在1.1~1.9μm的宽波段范围内达到10~(-2)的高数量级,色散在1.4~1.8μm的宽波段范围内实现了高负色散,而且在传输窗口波长1.55μm处,双折射可达到3.4×10~(-2),x-和y-偏振基模色散分别为-127 ps/(nm·km)和-428 ps/(nm·km)。此外,双折射、色散和有效面积特性随光子晶体光纤结构的变化也进行了详细的研究。基于其高双折射和高负色散特性,此种光纤可以广泛用于色散补偿光纤和偏振依赖型通讯系统。
A photonic crystal fiber with high birefringence and high negative dispersion was designed. In the cladding, compressed triangular lattice and two different sizes of oval air holes. Based on the super lattice construction method, the influence of the structural parameters of the photonic crystal fiber on the birefringence characteristics and dispersion characteristics was studied. Numerical results show that the birefringence is high order of 10 ~ (-2) in the wideband range of 1.1 ~ 1.9μm and high dispersion is achieved in the wideband range of 1.4 ~ 1.8μm. In the transmission window wavelength At 1.55μm, the birefringence can reach 3.4 × 10 ~ (-2). The fundamental mode dispersion of x- and y-polarization are -127 ps / (nm · km) and -428 ps / (nm · km), respectively. In addition, birefringence, dispersion and effective area characteristics with photonic crystal fiber structure changes have also been studied in detail. Based on its high birefringence and high negative dispersion characteristics, this fiber can be widely used in dispersion compensating fiber and polarization dependent communication systems.