High-extinction ratio and short-length polarization splitter based on microstructured optical fiber with tellurite glass

A new type of tellurite glass based on dual-core microstructured optical fiber with an Au wire has been numerically evaluated. This novel substance is a suitable optical fiber material for nonlinear applications due to its high nonlinear coefficient. A full-vector finite element method is employed to analyze the characteristics of the polarization splitter. A splitter with an ultrashort length of 1.079 mm and a high extinction ratio of 174.92 dB at the wavelength of 1.55 μm has been obtained. Moreover, the splitter exhibits a bandwidth with an extinction ratio as high as 20 dB of about 70 nm. An effective mode area Aeff of the optical fiber of 21.53 μm2 for one of the supermodes of the x even mode has been calculated.