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Transmission Line Design Considerations01:23

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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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Exposed-core single-mode-fiber channel-dropping filter using a high-index overlay waveguide.

C A Millar, M C Brierley, S R Mallinson

    Optics Letters
    |September 10, 2009
    PubMed
    Summary

    Researchers developed a novel wavelength-filtering device using fiber optic coupling. This device offers tunable channel dropping with high rejection and low insertion loss, advancing optical filtering technologies.

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    Area of Science:

    • Photonics
    • Optical Engineering
    • Materials Science

    Background:

    • Optical filters are crucial components in telecommunications and sensing.
    • Existing filters often face limitations in tunability, bandwidth, and insertion loss.
    • Waveguide-based devices offer potential for miniaturization and integration.

    Purpose of the Study:

    • To demonstrate a novel wavelength-filtering device with a channel-dropping response.
    • To explore the performance of two distinct filter designs based on overlay waveguide structures.
    • To achieve high-performance optical filtering with tunable characteristics.

    Main Methods:

    • Coupling light between a standard single-mode fiber and higher-order modes in a high-index overlay waveguide.
    • Fabrication and characterization of two types of overlay waveguides: thin and thick.
    • Measurement of filter response, including dropped band tunability, rejection ratio, and insertion loss.

    Main Results:

    • A single tunable dropped band response was achieved in the 1.2-1.6-micrometer wavelength region using a thin overlay waveguide.
    • Rejection greater than 20 dB and an insertion loss of approximately 0.5 dB were recorded for the thin waveguide filter.
    • A comb-filter response with a 13 nm channel spacing was demonstrated using a thick overlay waveguide, also with 20-dB rejection and 1-4 dB insertion loss.

    Conclusions:

    • The demonstrated high-index overlay waveguide structures enable efficient wavelength filtering with channel-dropping capabilities.
    • The thin waveguide design offers a tunable single-band filter, while the thick waveguide provides a multi-channel comb filter.
    • These devices present a promising solution for advanced optical communication and signal processing applications.