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Related Concept Videos

Vertical Curve: Problem Solving01:23

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Vertical curves provide the transition between two roadway grades, ensuring safety, comfort, and functionality. Calculating elevations at specific stations along the curve involves several systematic steps based on the curve's geometry and provided design parameters.The vertical curve is defined by its length, grades, Point of Vertical Intersection (P.V.I.) location, and P.V.I. elevation. The stations of the Point of Vertical Curvature (P.V.C.), where the curve begins, and the Point of Vertical...
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Vertical curves are parabolic transitions that connect different grades on highways and railroads, ensuring a smooth alignment between back and forward tangents. The back tangent represents the initial grade, while the forward tangent defines the subsequent grade. These curves can be symmetrical, with equal tangent lengths, or nonsymmetrical, with varying lengths. The key points defining a vertical curve include the Point of Vertical Intersection (P.V.I.), where the tangents meet; the Point of...
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Elevation of Intermediate Points on Vertical Curves01:20

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Vertical curves are essential in roadway design because they provide smooth transitions between varying roadway grades. Designing vertical curves involves calculating intermediate elevations and identifying the curve's highest or lowest point, which is essential for optimal roadway performance.Intermediate elevations on a vertical curve are determined using the tangent offset method. This method considers the initial elevation at the start of the curve, the grades, and the curve's geometry. The...
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Sight Distance in a Vertical Curve01:29

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Sight distance on vertical curves is critical in roadway design. It ensures drivers can see far enough ahead to identify and respond to hazards effectively. This directly impacts safety, driver comfort, and the overall efficiency of the transportation network.Vertical curves are classified into crest and sag curves based on their geometry. For crest curves, sight distance is determined by the line of sight between a driver's eye and a small object on the road's surface. Design parameters for...
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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Broad-band surface optical coupler based on a SiO2-capped vertically curved silicon waveguide.

Yuki Atsumi, Tomoya Yoshida, Emiko Omoda

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    Summary

    We developed a novel chip-surface optical coupler using a curved silicon waveguide and a dome-shaped silica cap. This device efficiently couples light into single-mode optical fibers, achieving low loss and broad bandwidth.

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    Area of Science:

    • Photonics
    • Optical Engineering
    • Materials Science

    Background:

    • Efficient optical coupling is crucial for integrated photonic circuits.
    • High-numerical-aperture single-mode optical fibers require specialized couplers for optimal performance.

    Purpose of the Study:

    • To demonstrate a chip-surface optical coupler for high-numerical-aperture single-mode optical fibers.
    • To achieve low coupling loss and broad bandwidth using a novel waveguide and coupler design.

    Main Methods:

    • Fabrication of a vertically curved silicon waveguide.
    • Integration of a dome-like silicon dioxide (SiO2) coupler cap using plasma-enhanced chemical vapor deposition.
    • Characterization of the optical coupling performance.

    Main Results:

    • The coupler effectively couples light into 5-µm mode-field diameter fibers.
    • The output light beam approximates a 5-µm-waist Gaussian beam.
    • Achieved coupling loss below 4.2 dB and a 0.5-dB-loss bandwidth exceeding 150 nm for TE-polarized light.

    Conclusions:

    • The demonstrated chip-surface optical coupler offers efficient light coupling for demanding fiber optic applications.
    • The use of a vertically curved waveguide and SiO2 cap provides a viable solution for integrated photonics.
    • The device exhibits promising performance metrics for broadband optical communication systems.