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<p>In this article, we designed a dense wavelength division multiplexing demultiplexer for C band applications and analyzed it for uniform spectral linewidth. The design is made with single ring cavity, modified overlap cavity, and overlap cavity, and it’s performance parameters are determined using simulations. The primary governing structure consists of a Y-shaped inverted input bus waveguide, a cavity, and a drop waveguide. The coupled mode theory is used to study the transmission and reflection properties at the ports. Plane Wave Expansion Method and Finite Difference Time Domain methods are used to determine Photonic Band Gap and observe normalized transmission of the proposed design for analysis, respectively. The proposed design results in a spectral line width of 0.1&#xa0;nm (at 12.5&#xa0;GHz) and 0.2&#xa0;nm (at 25&#xa0;GHz), a high-quality factor of 12,000, 100% transmission efficiency, and less crosstalk of -33&#xa0;dB, which meets ITU DWDM Standards. The footprint of the proposed structure is compact with a dimension of 64 µm<sup>2</sup>. Finally, the proposed demultiplexer design achieves a narrow and uniform spectral linewidth. It supports higher data rates, maximizes spectral efficiency, and reduces interference between adjacent channels. These features are essential for future real-time systems. The proposed demultiplexer design delivers a narrow and uniform spectral linewidth, enabling higher data rates, maximizing spectral efficiency, and minimizing interference between adjacent channels, making it ideal for future real-time communication systems in 6G networks.</p> Graphical Abstract <p></p>

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Design and Analysis of a Photonic Crystal DWDM Demultiplexer using an Overlap Ring Cavity to Drop Narrow Linewidth Channels

  • 期刊论文

  • 发表日期：

    2025年12月2日

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  • V. R. Balaji,
  • M. Medha,
  • Enaul haq Shaik,
  • A. Sivasubramanian,
  • Nadir Ali,
  • Gopalkrishna Hegde,
  • G.Vinitha

摘要

In this article, we designed a dense wavelength division multiplexing demultiplexer for C band applications and analyzed it for uniform spectral linewidth. The design is made with single ring cavity, modified overlap cavity, and overlap cavity, and it’s performance parameters are determined using simulations. The primary governing structure consists of a Y-shaped inverted input bus waveguide, a cavity, and a drop waveguide. The coupled mode theory is used to study the transmission and reflection properties at the ports. Plane Wave Expansion Method and Finite Difference Time Domain methods are used to determine Photonic Band Gap and observe normalized transmission of the proposed design for analysis, respectively. The proposed design results in a spectral line width of 0.1 nm (at 12.5 GHz) and 0.2 nm (at 25 GHz), a high-quality factor of 12,000, 100% transmission efficiency, and less crosstalk of -33 dB, which meets ITU DWDM Standards. The footprint of the proposed structure is compact with a dimension of 64 µm2. Finally, the proposed demultiplexer design achieves a narrow and uniform spectral linewidth. It supports higher data rates, maximizes spectral efficiency, and reduces interference between adjacent channels. These features are essential for future real-time systems. The proposed demultiplexer design delivers a narrow and uniform spectral linewidth, enabling higher data rates, maximizing spectral efficiency, and minimizing interference between adjacent channels, making it ideal for future real-time communication systems in 6G networks.

Graphical Abstract