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

Abstract 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 μ m 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 A eff of the optical fiber of 21.53 μ m 2 for one of the supermodes of the x even mode has been calculated.