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Tapered edge ridge waveguides for integrated optics.

T R Ranganath, W T Tsang, S Wang

    Applied Optics
    |February 16, 2010
    PubMed
    Summary

    We introduce a tapered edge ridge (TER) waveguide for integrated optics. This novel design minimizes scattering losses and allows for a large acceptance angle, improving device interconnectivity.

    Area of Science:

    • Integrated optics
    • Waveguide technology
    • Photonics

    Background:

    • Efficient interconnection of devices is crucial in integrated optics.
    • Traditional waveguides face limitations in acceptance angle and scattering losses.

    Purpose of the Study:

    • To propose and analyze a novel tapered edge ridge (TER) waveguide.
    • To demonstrate its capability for flexible device interconnection with minimal loss.

    Main Methods:

    • Experimental fabrication of a tantalum oxide TER waveguide on a 7059 glass substrate.
    • Optical coupling experiments to assess light propagation and scattering.
    • Theoretical modeling to compute ray trajectories and acceptance angles.

    Main Results:

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    • TER waveguides allow for very large acceptance angles due to their ridge structure.
    • Experiments show negligible scattering losses from tapered edges.
    • Successfully coupled light at a 20-degree angle with no apparent loss.
    • Theoretical analysis derived an expression for maximum acceptance angle (~42 degrees).

    Conclusions:

    • TER waveguides offer a flexible and efficient solution for integrated optical interconnections.
    • The design minimizes scattering losses, enhancing signal integrity.
    • The large acceptance angle simplifies device alignment and coupling.