基于碲酸盐玻璃的新型双芯光子晶体光纤偏振分束器

Dual-Core Photonic Crystal Fiber Polarization Splitter Based on Tellurite Glass

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 new kind of dual-core photonic crystal fiber （PCF） polarization splitter based on tellurite glass is designed. The full vector finite element method, coupled-mode theory and the full vector beam propagating method are emplyed to investigate the characteristics of the polarization splitter, meanwhile the quartz glass dual-core PCF polarization splitter with the same structural parameters is applied to compare. Numerical investigations demonstrate that the designed polarization splitter has higher extinction ratio and lower coupling loss. The two polarized lights are separated entirely with 441μm fiber at the wavelength of 1.55 μm and the extinction ratios in x and y polarization directions are - 50. 1 dB and - 53. 6 dB, respectively. When the extinction ratio is less than - 20 dB, the bandwidths are 34 nm and 36 nm respectively, and the coupling loss is only 0. 0009 dB .