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<p>This paper presents the design of a highly birefringent and highly nonlinear photonic crystal fiber based on sulfur-based glass (As<sub>2</sub>Se<sub>3</sub>). The structure incorporates two elliptical air holes and four circular air holes of different sizes at the fiber core. Using the full vector finite element method (FEM) with anisotropic perfectly matched layers, the birefringence characteristics, nonlinear properties, dispersion, and beat length in the wavelength range of 1.2–1.8&#xa0;μm are investigated by tuning the structural parameters of the fiber. The results show that the birefringence of the photonic crystal fiber reaches 0.172 at 1.55&#xa0;μm wavelength, while the nonlinear coefficients in the X-polarization direction are 149.31&#xa0;m<sup>−1</sup> W<sup>−1</sup>, and the nonlinear coefficients in the Y-polarization direction are 215.41&#xa0;m<sup>−1</sup> W<sup>−1</sup>. In addition, the PCF dispersion is normal in this band range and shows positive dispersion in the X-polarization direction and negative dispersion in the Y-polarization direction. Photonic crystal optical fibers based on the sulfur-based glass As<sub>2</sub>Se<sub>3</sub> have a simple structure and show significant potential for applications in various fields, such as optical coherence tomography (OCT) and super-resolution imaging technology in the medical field, optical sensors, and optical communications.</p>

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Design of highly birefringent, highly nonlinear photonic crystal fibers based on the sulfur glass As2Se3

  • 期刊论文

  • 发表日期：

    2025年7月7日

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  • Hua Wang,
  • Xinyi Zhang,
  • Chengen Zhang,
  • Jingya Zhao,
  • Zhiliang Chen,
  • Silei Wang,
  • Shuqing Yan,
  • Pibin Bing

摘要

This paper presents the design of a highly birefringent and highly nonlinear photonic crystal fiber based on sulfur-based glass (As2Se3). The structure incorporates two elliptical air holes and four circular air holes of different sizes at the fiber core. Using the full vector finite element method (FEM) with anisotropic perfectly matched layers, the birefringence characteristics, nonlinear properties, dispersion, and beat length in the wavelength range of 1.2–1.8 μm are investigated by tuning the structural parameters of the fiber. The results show that the birefringence of the photonic crystal fiber reaches 0.172 at 1.55 μm wavelength, while the nonlinear coefficients in the X-polarization direction are 149.31 m−1 W−1, and the nonlinear coefficients in the Y-polarization direction are 215.41 m−1 W−1. In addition, the PCF dispersion is normal in this band range and shows positive dispersion in the X-polarization direction and negative dispersion in the Y-polarization direction. Photonic crystal optical fibers based on the sulfur-based glass As2Se3 have a simple structure and show significant potential for applications in various fields, such as optical coherence tomography (OCT) and super-resolution imaging technology in the medical field, optical sensors, and optical communications.