Ultra-long bandwidth two-channel photonic crystal fiber polarization filter

In this paper, a two-channel photonic crystal fiber (PCF) polarization filter is designed base on surface plasma resonance. The full-vector Finite element method (FEM) was used for simulation analysis. The result is that the y-polarized confinement losses under optimal parameters are as high as 1496.46dB/cm and 1847.67dB/cm at wavelengths 1310nm and 1550nm, respectively. Meanwhile, when the fiber length is 1000μm, the crosstalk losss are -1298.08dB and -1591.23dB, at wavelengths 1310nm and 1550nm, respectively. The bandwidth with the two-channel filter is continuous and the range is large. Bandwidth greater than 20dB is 1060nm. This results show that the device has a broad prospect in the field of optical communication.