Numerical analysis of high extinction ratio photonic crystal fiber polarization splitter based on ZnTe glass

A polarization splitter based on dual-core square-lattice ZnTe glass photonic crystal fiber has been designed and simulated by finite element method. The numerical results reveal that extinction ratio ERA = −92.16 dB and ERB = −29.56 dB at the communication wavelength 1.55 μm, and the splitter with fiber length of 1.1452 mm provides bandwidths with extinction ratio better than −20 dB about 100 nm for x-polarization mode and 45 nm for y-polarization mode, respectively. At the communication wavelength 1.55 μm, insertion loss is 4.8×10-3dB for x  -polarization mode and 2.6×10-9dB for y-polarization mode respectively. We also compared the characteristics of ZnTe glass with those of silica glass.