Lu S, Li W, Guo H, Lu M
State Key Laboratory Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), Xi’an 710119, China.
Appl Opt. 2011 Oct 20;50(30):5798-802. doi: 10.1364/AO.50.005798.
Two types of high birefringence photonic crystal fiber (PCF) which import four or six big circular air holes near the elliptical-hole are proposed. Their birefringent and dispersive properties are analyzed by full-vector finite-element method (FEM). Numerical analysis demonstrates that importing the big circular hole near the center of elliptical-hole PCFs can achieve a high birefringence. When the ratio (d/Λ) of diameter to hole spacing is larger than 0.8, the proposed two types of PCF have a larger birefringence than that of sole elliptical air hole ones. When the ratio d/Λ is equal to 0.95, the birefringences of these two types PCF can be as high as 4.27×10(-3) and 5.09×10(-3) at the wavelength of 1.55 μm, respectively. Besides, PCF with the four big circular air holes has a large negative dispersion at the long wavelength in x-polarized mode, which indicates a potential in single-polarized mode dispersion compensation.
提出了两种在椭圆孔附近引入四个或六个大圆形气孔的高双折射光子晶体光纤（PCF）。采用全矢量有限元法（FEM）分析了它们的双折射和色散特性。数值分析表明，在椭圆孔PCF的中心附近引入大圆孔可以实现高双折射。当直径与孔间距的比值（d/Λ）大于0.8时，所提出的两种PCF的双折射比单一椭圆气孔PCF的双折射更大。当d/Λ等于0.95时，这两种PCF在1.55μm波长处的双折射分别可高达4.27×10^(-3)和5.09×10^(-3)。此外，具有四个大圆形气孔的PCF在x偏振模式下的长波长处具有较大的负色散，这表明其在单偏振模式色散补偿方面具有潜力。
