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Transverse Bragg reflection filtering in a dielectric waveguide.

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    We developed a new dielectric waveguide filter using transverse Bragg stacks. This compact device effectively filters light, showing high transmission in a specific wavelength range and significant loss at another, ideal for photonic integrated circuits.

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    Area of Science:

    • Photonics
    • Integrated Optics
    • Waveguide Technology

    Background:

    • Dielectric waveguides are crucial components in photonic integrated circuits.
    • Effective mode filtering is essential for signal integrity in dense optical systems.

    Purpose of the Study:

    • To propose and numerically investigate a narrow bandpass dielectric waveguide filter.
    • To demonstrate the filtering capabilities of transverse Bragg stacks in dielectric waveguides.

    Main Methods:

    • Numerical investigation of a dielectric waveguide filter design.
    • Utilizing transverse Bragg reflection from symmetrically placed Bragg stacks.
    • Simulating filter performance based on Bragg stack dimensions.

    Main Results:

    • Achieved high transmission (≥95%) within the 1294-1326 nm wavelength range.
    • Demonstrated significant signal loss (up to 93.4%) at 1550 nm.
    • The filter's effectiveness is linked to the Bragg stacks' longitudinal length (3.86 μm).

    Conclusions:

    • Transverse Bragg stacks provide effective fundamental mode filtering in dielectric waveguides.
    • The proposed filter exhibits narrow bandpass characteristics.
    • The simple and compact structure is suitable for highly dense photonic integrated circuits.