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Efficient silicon nitride grating coupler with distributed Bragg reflectors.

Huijuan Zhang, Chao Li, Xiaoguang Tu

    Optics Express
    |October 17, 2014
    PubMed
    Summary
    This summary is machine-generated.

    We developed a high-efficiency silicon nitride grating coupler at 1490 nm using Distributed Bragg reflectors. This device achieves a peak coupling efficiency of -2.5 dB and a 53 nm bandwidth, suitable for photonic circuits.

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    Area of Science:

    • Photonics
    • Materials Science
    • Optical Engineering

    Background:

    • Grating couplers are essential for interfacing optical fibers with integrated photonic circuits.
    • Improving coupling efficiency and bandwidth is crucial for advanced photonic applications.
    • Silicon nitride is a promising material for photonic integrated circuits due to its low loss and high refractive index.

    Purpose of the Study:

    • To design, fabricate, and characterize a high-efficiency silicon nitride grating coupler.
    • To enhance coupling efficiency using Distributed Bragg reflectors.
    • To assess the device's performance at a wavelength of 1490 nm.

    Main Methods:

    • Design and simulation of a silicon nitride grating coupler structure.
    • Fabrication using a CMOS-compatible process.
    • Characterization of coupling efficiency and 1-dB bandwidth.
    • Integration of Distributed Bragg reflectors as bottom mirrors.

    Main Results:

    • Achieved a peak coupling efficiency of -2.5 dB.
    • Obtained a 1-dB bandwidth of 53 nm.
    • Demonstrated the effectiveness of Distributed Bragg reflectors in enhancing downward light reflection.

    Conclusions:

    • The developed silicon nitride grating coupler exhibits high efficiency and a significant bandwidth.
    • The CMOS-compatible fabrication process facilitates integration with existing photonic circuits.
    • This device is a viable component for next-generation photonic integrated systems.