Numerical analysis of ultrabroadband polarization splitter based on gold-filled dual-core photonic crystal fiber

An ultrabroadband polarization splitter based on gold-filled dual-core photonic crystal fiber (PCF) has been proposed. The resonance strength of the surface plasmon mode and polarization-splitter characteristics are studied by changing the positions and amount of gold wires and the structural parameters of PCF through simulation based on finite element method. The polarization splitter can provide extinction ratio lower than −20 dB with a bandwidth of 400 nm covering almost all communication bands (O, E, S, C, L and U bands).