为了获得双空气孔单元四边形晶格排列光子晶体光纤的光学特性, 采用有限元分析法对该型光纤进行了数值模拟计算, 得到了该型光纤的双折射、限制损耗、偏振拍长及色散特性结果。结果表明, 与椭圆空气孔方形晶格排列光子晶体光纤相比, 在相同的空气占空比条件下, 双空气孔单元方形晶格排列光子晶体光纤可以获得更高的双折射特性, 达到10-2量级; 该型光纤两偏振模的限制损耗差可达103量级。该型光纤易于制造, 在光纤通信及光纤传感等领域有一定的应用前景。

In order to obtain optical characteristics of the photonic crystal fiber with double air holes and quadrilateral lattice arrangement, the finite element method was used to simulate the fiber. The results of birefringence, limiting loss, polarization beat length and dispersion characteristics of the fiber were obtained. The results show that, compared with the elliptical air hole photonic crystal fiber with square lattice arrangement, the double air hole photonic crystal fiber with square lattice arrangement can obtain higher birefringence characteristics, reaching 10-2 orders of magnitude, under the same air duty cycle conditions. The limiting loss difference of the two polarization modes of the fiber can reach 103 order of magnitude. This type of optical fiber is easy to manufacture, and has a certain application prospect in optical fiber communication and optical fiber sensing.