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<p>This study investigates large-core photonic crystal fibers (PCFs) composed of As<sub>2</sub>S<sub>3</sub> chalcogenide for their potential in supercontinuum (SC) generation owing to their tunability in terms of chromatic dispersion, nonlinearity, and loss characteristics. We compare SC generation spectra within an all-normal dispersion regime across three lattice geometries: hexagonal, circular, and square. The numerical simulations employed peak power and pulse width values of 5.83&#xa0;kW and 120&#xa0;fs, respectively. These pump source parameters resulted in mid-infrared SC ranges ranging from 2 to 6.9&#xa0;μm for hexagonal, 2.15–7&#xa0;μm for circular, and 2.2–8.1&#xa0;μm for square lattices. Notably, the square lattice configuration yielded the broadest SC spectrum, attributed to its extensive flat dispersion band, whereas the circular lattice design achieved the flattest spectrum with 4 dB variation in the 1.79&#xa0;μm band at the pump wavelength close to the maximum dispersion point. Furthermore, at low peak power, these spectral ranges surpass those reported for all-normal dispersion PCFs in previous studies. The proposed structures are promising for applications in low-peak power all-fiber optical systems.</p>

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Large-core As2S3 photonic crystal fibers with three different lattices for ultra-flattened supercontinuum generation spectra

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月30日

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  • Ben Chu Van,
  • Bao Tran Le Tran,
  • Lan Phan Thi,
  • Hieu Nguyen Trung,
  • Lanh Chu Van

摘要

This study investigates large-core photonic crystal fibers (PCFs) composed of As2S3 chalcogenide for their potential in supercontinuum (SC) generation owing to their tunability in terms of chromatic dispersion, nonlinearity, and loss characteristics. We compare SC generation spectra within an all-normal dispersion regime across three lattice geometries: hexagonal, circular, and square. The numerical simulations employed peak power and pulse width values of 5.83 kW and 120 fs, respectively. These pump source parameters resulted in mid-infrared SC ranges ranging from 2 to 6.9 μm for hexagonal, 2.15–7 μm for circular, and 2.2–8.1 μm for square lattices. Notably, the square lattice configuration yielded the broadest SC spectrum, attributed to its extensive flat dispersion band, whereas the circular lattice design achieved the flattest spectrum with 4 dB variation in the 1.79 μm band at the pump wavelength close to the maximum dispersion point. Furthermore, at low peak power, these spectral ranges surpass those reported for all-normal dispersion PCFs in previous studies. The proposed structures are promising for applications in low-peak power all-fiber optical systems.