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<p>In this paper, a single-polarized photonic crystal fiber(PCF) filter for the communication band was proposed. The polarization properties of PCF with a single gold-coated liquid-filled hole have been investigated by the full vector finite element method(FEM). Extensive simulations reveal that near the 1310&#xa0;nm communication wavelength, the y-polarized core mode exhibits a significantly higher peak loss intensity of 453.46&#xa0;dB/cm compared to the x-polarized core mode's substantially lower value of 2.068&#xa0;dB/cm. With a length of 500&#xa0;μm of the designed PCF, the bandwidths of the crosstalk less than -20&#xa0;dB can reach to 213&#xa0;nm. Fiber filters can accurately implement the filtering function for a single communication window. It is expected to play a key role in optical communication, optical sensing and other related fields, providing strong support for technological development and application expansion in these fields.</p>

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Photonic crystal fiber polarization filters with gold-coated and liquid-filled air holes based on surface plasmon resonances

  • 期刊论文

  • 发表日期：

    2025年9月22日

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  • Qi Zhai,
  • Shuhuan Zhang,
  • Min Peng,
  • Ying Yang,
  • Hongwei Zhu,
  • Bangquan Li,
  • Yang Zhang,
  • Jiyu Dong

摘要

In this paper, a single-polarized photonic crystal fiber(PCF) filter for the communication band was proposed. The polarization properties of PCF with a single gold-coated liquid-filled hole have been investigated by the full vector finite element method(FEM). Extensive simulations reveal that near the 1310 nm communication wavelength, the y-polarized core mode exhibits a significantly higher peak loss intensity of 453.46 dB/cm compared to the x-polarized core mode's substantially lower value of 2.068 dB/cm. With a length of 500 μm of the designed PCF, the bandwidths of the crosstalk less than -20 dB can reach to 213 nm. Fiber filters can accurately implement the filtering function for a single communication window. It is expected to play a key role in optical communication, optical sensing and other related fields, providing strong support for technological development and application expansion in these fields.