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<p>We present a compact in-fiber polarization beam splitter (PBS) implemented in a gold-coated dual-core photonic crystal fiber (DC-PCF), using finite element method (FEM). The octagonally arranged DC-PCF achieves enhanced birefringence through optimized structural design. Gold layers integrated within the two large air holes induce surface plasmon resonance (SPR), which modulates the optical response at the edges of the operational band and enhances polarization splitting efficiency. Numerical analysis shows that when the lattice gap <i>Λ</i> = 1.6&#xa0;μm, diameters <i>d</i><sub><i>1</i></sub> = 1.2&#xa0;μm,<i> d</i><sub><i>2</i></sub> = 0.5&#xa0;μm, <i>d</i><sub><i>3</i></sub> = 2.1&#xa0;μm, <i>d</i><sub><i>4</i></sub> = 0.7&#xa0;μm, and a gold layer thickness of <i>t</i> = 50&#xa0;nm, this PBS achieves a coupling length ratio (CLR) of 0.5 at 1.55&#xa0;μm. It exhibits a shortest splitting length of 220&#xa0;μm and a maximum extinction ratio (ER) of -133&#xa0;dB over an operating bandwidth of 140&#xa0;nm. The fabrication process and experimental setup are analyzed. It is worth anticipating that this polarizer will emerge as a crucial signal processing component in photonic integrated systems, driving the continuous advancement of communication systems and information technology.</p>

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Numerical simulation of a compact in-fiber polarization beam splitter using gold layers deposited octagonal dual-core photonic crystal fiber

  • 期刊论文

  • 发表日期：

    2026年1月7日

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  • Yiming Xu,
  • Chenxun Liu,
  • Nan Chen,
  • Xin Ding,
  • Hui Chen,
  • Fan Yang,
  • Jianing Zhang,
  • Leilei Gao,
  • Yuxin Zhu

摘要

We present a compact in-fiber polarization beam splitter (PBS) implemented in a gold-coated dual-core photonic crystal fiber (DC-PCF), using finite element method (FEM). The octagonally arranged DC-PCF achieves enhanced birefringence through optimized structural design. Gold layers integrated within the two large air holes induce surface plasmon resonance (SPR), which modulates the optical response at the edges of the operational band and enhances polarization splitting efficiency. Numerical analysis shows that when the lattice gap Λ = 1.6 μm, diameters d1 = 1.2 μm, d2 = 0.5 μm, d3 = 2.1 μm, d4 = 0.7 μm, and a gold layer thickness of t = 50 nm, this PBS achieves a coupling length ratio (CLR) of 0.5 at 1.55 μm. It exhibits a shortest splitting length of 220 μm and a maximum extinction ratio (ER) of -133 dB over an operating bandwidth of 140 nm. The fabrication process and experimental setup are analyzed. It is worth anticipating that this polarizer will emerge as a crucial signal processing component in photonic integrated systems, driving the continuous advancement of communication systems and information technology.