Design of polarization splitter based on dual-core surface plasmon resonance photonic crystal fiber

In this article, a solid silica core plasmonic photonic crystal fiber-based polarization splitter is proposed to concurrently achieve a short length, good extinction ratio, and acceptable bandwidth at communication wavelength. The model consists of dual-core design with a series of air holes arranged symmetrically. The surface plasmon resonance (SPR) active metal is metallic gold. Resonant coupling between the second-order surface plasmon polaritons (SPP) mode and the core-guided modes can improve the coupling characteristics of the developed dual-core photonic crystal fiber (DC-PCF). A complete analysis was performed using the finite element method for wavelengths from 1200 to 2100 nm. The splitter extinction ratio at the 1.55 mu m wavelength is 149.9 dB, which is better than - 20 dB. The splitter has a short length of 34 mu m and a bandwidth of 200 nm. In comparison to the designed DC-PCF with gold wire, a gold layer is put into the designed DC-PCF to achieve excellent splitting performance and reasonable bandwidth. Therefore, the proposed design proves to be highly applicable in fiber-optic communication systems.