Polarization splitter based on hybrid-cladding dual-core photonic crystal fibers

This paper proposed a novel type of hybrid-cladding dual-core photonic crystal fiber (PCF) with two larger air-holes around each fiber core. The effects of structural parameters on coupling length were analyzed through full-vector finite element method. A 658 μm-long polarization beam splitter based on the proposed dual-core PCF was completed by birefringence effect. Numerical simulations demonstrated that the polarized light extinction ratio was −42.9 dB at the wavelength of 1.55 μm. The bandwidth arranged over 120 nm when the extinction ratio was lower than −10 dB, which exhibited high performance of splitting one light into two orthogonal polarization states.