Mid-Infrared Broadband Polarization Beam Splitter based on GaS Photonic Crystal Fiber

A mid-infrared polarization beam splitter (PBS) based on GaS dual-core photonic crystal fiber (DC-PCF) with large bandwidth is proposed. The numerical simulation results indicate that when the incident light wavelength is chosen as 4.5 µm, the splitting length is 150.9 µm, the maximum extinction ratio of 75.51 dB, and the working bandwidth is up to 285 nm (4.354-4.639 µm).