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Planar waveguide moiré grating.

Shengping Liu, Yuechun Shi, Yating Zhou

    Optics Express
    |October 19, 2017
    PubMed
    Summary
    This summary is machine-generated.

    We introduce a novel planar waveguide moiré grating (MG) for easier fabrication in photonic integrated devices. This new structure offers tunable properties for advanced applications like distributed feedback (DFB) semiconductor lasers.

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    Area of Science:

    • Photonics
    • Optoelectronics
    • Semiconductor Devices

    Background:

    • Conventional moiré gratings (MG) are typically realized by superimposing two Bragg gratings.
    • Fabrication of superimposed gratings can be complex and challenging for integration into devices.

    Purpose of the Study:

    • To propose and investigate a new planar waveguide moiré grating (MG) structure.
    • To demonstrate the feasibility of easier fabrication using semiconductor microfabrication processes.
    • To explore the potential applications of this planar MG in photonic integrated devices.

    Main Methods:

    • The proposed planar waveguide moiré grating (MG) is formed by two transverse adjacent gratings with slightly different Bragg wavelengths.
    • The structure's light properties are analyzed and compared to conventional MGs.
    • The coupling coefficient distribution is adjusted by controlling the alignment of the adjacent gratings.

    Main Results:

    • The planar waveguide moiré grating (MG) exhibits similar light properties to conventional MGs.
    • Fabrication is simplified due to the planar pattern, benefiting semiconductor microfabrication.
    • Tunable coupling coefficient distribution allows for special grating profiles, including perfect apodization.

    Conclusions:

    • The planar waveguide moiré grating (MG) offers a simplified fabrication route for photonic integrated devices.
    • Adjustable grating properties enable advanced applications, particularly in distributed feedback (DFB) semiconductor lasers.
    • Potential improvements include reduced spatial-hole burning and enhanced power extraction in DFB lasers.