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Vertically integrated waveguide self-coupled resonator based tunable optical filter.

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    A novel tunable optical filter uses an S-bend waveguide coupled to a racetrack resonator. This design offers independent control over spectrum response and stable wavelength tuning for optical filters and switches.

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    Area of Science:

    • Photonics
    • Optical Engineering
    • Integrated Optics

    Background:

    • Conventional tunable optical filters often employ U-bend waveguide structures.
    • Achieving independent control over spectral response and stable tuning remains a challenge.

    Purpose of the Study:

    • To demonstrate a vertically integrated waveguide self-coupled resonator based tunable optical filter.
    • To compare different waveguide coupling effects for optimized performance.

    Main Methods:

    • Utilized a top-layer S-bend waveguide cross-coupled with a bottom-layer racetrack resonator.
    • Investigated varying coupling coefficients to design the spectrum response.
    • Employed a heater on the resonator for wavelength tuning.

    Main Results:

    • Achieved a high quality factor and free spectral range comparable to conventional structures.
    • Demonstrated independent design of spectrum response by adjusting the coupling coefficient.
    • Confirmed stable wavelength tuning using a resonator heater, with minimal impact from a waveguide heater.

    Conclusions:

    • The S-bend waveguide coupled resonator offers a stable and tunable optical filter solution.
    • The device design allows for separate control over spectral characteristics.
    • Potential applications include tunable modulators and switches.