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设计了一种具有高负平坦色散特性的压缩型高双折射光子晶体光纤。为了获得高双折射特性,光纤包层采用压缩三角格子和椭圆空气孔的结构;为了提高控制色散的灵活性,在纤芯加入小的缺陷空气孔。基于超格子构造法,详细地模拟分析了光纤的双折射、色散特性。研究结果表明:在波长1.3~1.8μm的宽波段范围内,可获得高负平坦色散且色散值约为-667 ps·nm~(-1)·km~(-1),色散值在±7 ps·nm~(-1)·km~(-1)的范围内变化;双折射在波长研究范围内都实现了10~(-2)的高数量级,且在1.55μm处可达到2.21×10~(-2)。基于此种光纤的高负色散特性和高双折射在光传输系统及光纤传感有广泛应用。
A compact high birefringence photonic crystal fiber with high negative-negative flat dispersion was designed. In order to obtain high birefringence properties, the fiber cladding uses a compressed triangular lattice and elliptical air hole structure; in order to improve the control dispersion of the flexibility in the core by adding a small defect air holes. The birefringence and dispersion characteristics of optical fiber are simulated and analyzed in detail based on the super lattice construction method. The results show that in the wavelength range of 1.3 ~ 1.8μm, high negative flat dispersion can be obtained with a dispersion value of -667 ps · nm -1 (km -1) and a dispersion value of ± 7 ps · nm ~ (-1) · km ~ (-1). The birefringence is high order of 10 ~ (-2) in the range of wavelength and can reach 2.21 × 10 at 1.55μm ~ (-2). Based on this kind of fiber, high negative dispersion property and high birefringence are widely used in optical transmission system and optical fiber sensing.