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Narrowband reflector based on a side-coupled transverse-mode-conversion Bragg grating resonator.

Jixiang Shen, Yong Zhao, Ruxin Wang

    Applied Optics
    |August 12, 2025
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    Summary

    We developed a novel narrowband reflector (NBR) using silicon nitride, capable of producing a box-like reflection spectrum without Vernier tuning. This device is ideal for creating narrow linewidth lasers with stable performance.

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    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science
    • Integrated Optics

    Background:

    • Narrowband reflectors are crucial components in photonic integrated circuits.
    • Existing designs often require complex tuning mechanisms like the Vernier effect.
    • Achieving specific spectral shapes, such as box-like profiles, remains a challenge.

    Purpose of the Study:

    • To propose and analyze a novel narrowband reflector (NBR) on a silicon nitride platform.
    • To demonstrate a device that achieves a box-like reflection spectrum without active tuning.
    • To explore its application as an external cavity for narrow linewidth lasers.

    Main Methods:

    • Design of a side-coupled transverse-mode-conversion Bragg grating resonator.
    • Utilizing anti-symmetric Bragg gratings (ASBGs) and a uniform Bragg grating (UBG) for mode coupling.
    • Numerical simulations to evaluate spectral characteristics and performance.

    Main Results:

    • Achieved a reflection of -0.814 dB with a Full Width at Half Maximum (FWHM) of 0.34 nm.
    • Demonstrated a high Side Lobe Suppression Ratio (SLSR) of 44 dB.
    • The device exhibits robustness against slight laser wavelength chirping and does not require Vernier tuning.

    Conclusions:

    • The proposed silicon nitride NBR offers a robust and efficient solution for narrowband spectral control.
    • Its ability to produce a box-like spectrum and operate without tuning makes it suitable for laser external cavities.
    • The design paves the way for advanced photonic devices requiring precise spectral shaping.