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Related Experiment Video

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Writing Bragg Gratings in Multicore Fibers
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Towards femtosecond laser written arrayed waveguide gratings.

G Douglass, F Dreisow, S Gross

    Optics Express
    |September 15, 2015
    PubMed
    Summary

    Femtosecond laser direct-write fabrication enables high-quality arrayed waveguide gratings (AWGs). This method creates uniform planar waveguides and low-loss tapers, improving transmission by 90% for integrated photonic devices.

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    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science and Nanotechnology

    Background:

    • Arrayed waveguide gratings (AWGs) are crucial for wavelength division multiplexing.
    • Traditional fabrication methods can be complex and costly.
    • Femtosecond laser direct-write (FsLDW) offers a promising alternative for integrated optics.

    Purpose of the Study:

    • To investigate the fabrication of AWGs using the FsLDW technique.
    • To demonstrate the creation of large planar waveguides for 2D free propagation zones.
    • To assess the refractive index uniformity and transmission efficiency of fabricated devices.

    Main Methods:

    • Utilizing the femtosecond laser direct-write technique for waveguide fabrication.
    • Creating large planar slabs acting as 2D free propagation zones.
    • Incorporating low-loss linear adiabatic tapers.
    • Employing continuous contouring strategies to minimize defects.

    Main Results:

    • Successful fabrication of large planar waveguides with high refractive index uniformity (1.97% standard deviation).
    • Achieved a 90% increase in transmission due to the integration of adiabatic tapers.
    • Demonstrated strategies for defect reduction in laser-written AWGs.

    Conclusions:

    • FsLDW is a viable technique for fabricating high-performance AWGs.
    • The method allows for precise control over waveguide properties and efficient light propagation.
    • Continuous contouring is key to manufacturing integrated laser-written AWGs with minimal losses.