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<p>This paper introduces a four-channel optical demultiplexer employing a cascade connection of four compact photonic crystal ring resonators. The design of the ring resonator incorporates a two-dimensional square lattice of dielectric rods forming a photonic crystal structure. Optimization of the resonator ring shape, the 90-degree bend of the output, and the radius of the coupling rods are undertaken to achieve a four-channel demultiplexer. The normalized transmission characteristics are investigated using the two-dimensional finite difference time domain (FDTD) method. The results demonstrate a maximum normalized transmission efficiency of 98%, a Q-factor of 5691, a free spectral range (FSR) of 113 nm, cross-talk at -10.3 dB, a minimum bandwidth of 0.22 nm, and a channel spacing of 2.7 nm. The achieved narrowband demultiplexer exhibits a minimum distance between channels and a low full-width at half-maximum (FWHM), making it a promising candidate for integration into optical fiber channels within telecommunication systems.</p>

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Narrow-bandwidth optical four-channel demultiplexer based on a compact silicon photonic crystal ring resonator

  • 期刊论文

  • 发表日期：

    2026年2月12日

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  • Ghader Mohammadi,
  • Ali Asghar Orouji,
  • Mohammad Danaie

摘要

This paper introduces a four-channel optical demultiplexer employing a cascade connection of four compact photonic crystal ring resonators. The design of the ring resonator incorporates a two-dimensional square lattice of dielectric rods forming a photonic crystal structure. Optimization of the resonator ring shape, the 90-degree bend of the output, and the radius of the coupling rods are undertaken to achieve a four-channel demultiplexer. The normalized transmission characteristics are investigated using the two-dimensional finite difference time domain (FDTD) method. The results demonstrate a maximum normalized transmission efficiency of 98%, a Q-factor of 5691, a free spectral range (FSR) of 113 nm, cross-talk at -10.3 dB, a minimum bandwidth of 0.22 nm, and a channel spacing of 2.7 nm. The achieved narrowband demultiplexer exhibits a minimum distance between channels and a low full-width at half-maximum (FWHM), making it a promising candidate for integration into optical fiber channels within telecommunication systems.