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Transmission Line Design Considerations

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Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
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The Bewley lattice diagram, developed by L. V. Bewley, effectively organizes the reflections occurring during transmission-line transients. It visually represents how voltage waves propagate and reflect within a transmission line, making it easier to understand the complex interactions that occur.
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Related Experiment Video

Updated: May 22, 2025

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
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Compact inverse-designed tilted waveguide crossing.

Xiaoyan Zhang, Wu Xie, Chewping Leong

    Optics Letters
    |March 14, 2025
    PubMed
    Summary

    We developed a novel, compact silicon waveguide crossing using inverse design. This device significantly reduces crosstalk and insertion loss, enabling high-density photonic integrated circuits for data centers and quantum photonics.

    Area of Science:

    • Photonics
    • Integrated Optics
    • Nanotechnology

    Background:

    • Waveguide crossings are crucial for advanced photonic integrated circuits (PICs).
    • Existing designs often face limitations in integration density and routing flexibility due to size and performance trade-offs.
    • Minimizing insertion loss and crosstalk is essential for efficient signal transmission.

    Purpose of the Study:

    • To propose and demonstrate a novel, compact, tilted silicon waveguide crossing.
    • To optimize the design for minimal insertion loss and crosstalk using inverse design methods.
    • To establish a new benchmark for silicon waveguide crossings in terms of size and performance.

    Main Methods:

    • Utilized inverse design methods, specifically adjoint optimization algorithms.

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  • Employed finite-difference time-domain (FDTD) simulations for performance analysis.
  • Conducted experimental validation to confirm simulation results.

    • Main Results:

    • Achieved a crosstalk reduction from -46 dB to -54 dB at an 86° crossing angle.
    • Obtained a low insertion loss of -0.14 dB at 1310 nm.
    • Minimized the device footprint to 8 × 8 μm², a new benchmark for compact crossings.

    Conclusions:

    • The novel tilted silicon waveguide crossing offers superior performance (low loss, low crosstalk) in an ultra-compact footprint.
    • Inverse design is a powerful tool for optimizing complex photonic devices.
    • The demonstrated device is highly suitable for high-density PICs, with applications in data centers and quantum photonics.