设计了一种基于碲酸盐玻璃的双芯光子晶体光纤(PCF)偏振分束器,采用全矢量有限元法和模式耦合基本理论以及全矢量光束传播法对其特性进行了研究,并与相同结构参数的石英玻璃双芯光子晶体光纤偏振分束器的特性进行了对比。结果表明,此种偏振分束器有更高的消光比和极低的耦合损耗,在工作波长为1.55μm,光纤长度为441μm时,两偏振光实现分离,两个纤芯在x、y方向偏振光的消光比分别达到-50.1dB和-53.6dB,消光比小于-20dB的带宽分别为34nm和36nm,耦合损耗仅为0.0009dB。 A dual-core PCF polarizing beam splitter based on tellurite glass was designed and its characteristics were studied by the full-vector finite element method and the basic theory of mode coupling as well as the full-vector beam propagation method. Structural parameters of quartz glass dual-core photonic crystal fiber polarization beam splitter characteristics were compared. The results show that this kind of polarization beam splitter has higher extinction ratio and very low coupling loss. When the working wavelength is 1.55μm and the optical fiber length is 441μm, the two polarized lights are separated. The two cores are separated in the x and y directions The extinction ratio of polarized light reaches -50.1dB and -53.6dB respectively, the bandwidth of extinction ratio less than -20dB is 34nm and 36nm respectively, and the coupling loss is only 0.0009dB.