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Design of Prismatic Beams for Bending01:23

Design of Prismatic Beams for Bending

The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and stress...

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Related Experiment Video

Updated: Jun 22, 2026

Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System
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Modeling and design of irregularly arrayed waveguide gratings.

Feng Xiao, Guangyuan Li, Anshi Xu

    Optics Express
    |June 18, 2009
    PubMed
    Summary

    Irregularly arrayed waveguide gratings (IAWGs) offer arbitrary free spectral ranges and more channels in smaller areas. This new design enables flexible channel selection with improved performance for optical communication systems.

    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics

    Background:

    • Arrayed waveguide gratings (AWGs) are key components in wavelength-division multiplexing (WDM) systems.
    • Conventional AWGs have limitations in free spectral range and channel density within a given footprint.

    Purpose of the Study:

    • To introduce and theoretically analyze irregularly arrayed waveguide gratings (IAWGs) as an advancement over conventional AWGs.
    • To demonstrate the potential of IAWGs for high-channel-count optical devices with enhanced flexibility.

    Main Methods:

    • Development of a Fourier optics model to simulate transmission characteristics of both conventional AWGs and IAWGs.
    • Design and simulation of a 1080-channel IAWG with a channel spacing of 0.199 nm.

    Main Results:

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    • IAWGs theoretically offer arbitrary free spectral ranges and reduced circuit regions for a large number of channels.
    • Simulations show a 1080-channel IAWG fits within a 6-inch wafer, supporting two operational modes.
    • Mode 1: all 1080 channels with ~ -20 dB crosstalk. Mode 2: 128 movable channels with ~ -32 dB crosstalk.

    Conclusions:

    • IAWGs represent a promising technology for next-generation optical communication systems requiring high channel counts and flexibility.
    • The proposed Fourier optics model accurately predicts the performance of IAWGs.
    • IAWG designs can achieve high channel density and tunable channel selection with acceptable crosstalk levels.