An ultra-short polarization beam splitter based on dual-core photonic crystal fiber with a nematic liquid crystal filled air hole

An ultra-short polarization beam splitter based on dual-core photonic crystal fiber with a nematic liquid crystal filled air hole is designed. The designed ultra-short PBS has a splitting length of 65 $\mu$m and the maximum extinction ratio of 101.72 dB. In addition, its bandwidth is about 364 nm, which covers the most O+E+S+C+L communication band.