Chalcogenide dual-core all-solid anti-resonant fiber polarization beam splitter operating at 3 μm band

作者：Zhenlong Zhang, Haitao Guo, Jianshe Li, Yuanyuan Zhao, Shuguang Li, Yantao Xu, Yanjie Chang, Hao Zhang · 发表于：Physica Scripta · 年份：2025 · DOI：10.1088/1402-4896/ada326 · 被引用次数：7 · 研究领域：Photonic Crystal and Fiber Optics、Advanced Fiber Optic Sensors、Photonic and Optical Devices

Abstract For the first time, we proposed a polarization beam splitter (PBS) designed based on chalcogenide dual-core all-solid anti-resonance fiber (AS-ARF) and simulated it numerically using the finite element method (FEM). Two large cladding tubes are introduced to divide the fiber core into fiber cores A and B. Mode coupling and energy exchange between the two fiber cores are enabled through the gap g between the two large cladding tubes. By adjusting the structural parameters of the AS-ARF, polarization beam-splitting ability and single-mode characteristics can be obtained. The influence of the position of the nested tube within the large cladding tube on the performance of the PBS is further investigated. The numerical results show that the beam-splitting lengths of the two proposed PBSs are 9.5 cm and 8.2 cm, respectively, and the polarization extinction ratios (PERs) are −55.98 dB and −41.35 dB at 3 μm. In the wavelength range from 2.98 μm to 3.03 μm, both PBSs can simultaneously achieve polarization beam-splitting and single-mode characteristics. The proposed chalcogenide-based dual-core AS-ARF is a suitable candidate for PBS in the mid-infrared 3 μm band.