Analysis of a Broadband and Tunable Short-length Polarization Splitter on Photonic Crystal Fiber

We propose a straightforward dual-core photonic crystal fiber-based polarization splitter having extraordinary characteristics. Due to the nematic liquid crystal infilling, the mode birefringence increases significantly, enabling the splitter to attain a wide bandwidth of 356 nm, by keeping extinction ratio greater than 20 dB, and a short splitting length of 71.35 $\mu$m. The best performance is observed at 1550 nm of wavelength with a maximum extinction ratio of 83.3 dB. Additionally, the device could be thermally tuned to operate it within 1200 nm to 1650 nm of wavelength, thanks to the nematic liquid crystal infiltration. Hence, the device is a good match for current splitters due to its wide bandwidth, compact size, and tuning ability.