在光子晶体光纤二氧化硅材料中掺入氟元素、在光纤中引入七个椭圆空气孔以及三角形和矩形周期性空气圆孔, 设计了一种氟掺杂双芯光子晶体光纤偏振光分束器.对该分束器结构参量进行优化,对分束器分离两正交偏振光的性能进行分析.结果表明：在优化结构尺寸下, 当光纤长度为102.717 μm的超短长度时, 在1.55 μm波长处具有超强的分离两束正交偏振光的能力, 消光比可以达到126.442 dB, 具有60 nm的有效带宽.此偏振光分束器在大容量光通信系统中具有重要的应用价值.

A type of fluorine doped dual core photonic crystal fiber polarization light splitter was designed by introducing fluorine in photonic crystal fiber silica materials and seven elliptical air holes and triangle and rectangular periodic air hole in this fiber. The structural parameters were optimized through the study of some parameters in the split structure and the performance of the split two orthogonal polarized light was analyzed.The results show that : in the optimized structure size, when the length of optical fiber is taken as the length of ultrashort 102.717 μm,it has a super separate ability which the two beams of orthogonal polarized light at the wavelength of 1.55 μm, the extinction ratio can reach 126.442 dB. Also, with 60 nm effective bandwidth.Therefore,this polarized optical splitter has an important application value in large capacity optical communication system.