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Distributed feedback lasers with alternating laterally coupled ridge-waveguide surface gratings.

Topi Uusitalo, Heikki Virtanen, Maija Karjalainen

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    |August 16, 2017
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    Distributed feedback lasers with alternating gratings offer improved performance. This design simplifies fabrication and results in lower threshold currents and higher slope efficiencies compared to symmetric gratings.

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    Area of Science:

    • Photonics and Semiconductor Lasers
    • Integrated Optics
    • Nanophotonics

    Background:

    • Distributed feedback (DFB) lasers are crucial for optical communication.
    • Current DFB laser fabrication faces challenges with grating complexity and trench width.
    • Optimizing grating design is key to enhancing laser performance and manufacturability.

    Purpose of the Study:

    • To demonstrate DFB lasers utilizing laterally coupled ridge-waveguide surface gratings with alternating protrusions.
    • To investigate the impact of this alternating grating design on fabrication ease and laser output characteristics.
    • To compare the performance of alternating gratings with traditional symmetric gratings.

    Main Methods:

    • Fabrication of DFB lasers with novel alternating surface gratings.
    • Design strategy and coupling coefficient calculations for the alternating grating structure.
    • Characterization of laser output parameters, including threshold current and slope efficiency.

    Main Results:

    • The alternating grating configuration allows for wider, easier-to-fabricate trenches.
    • Fabricated lasers with first-order alternating gratings exhibited lower threshold currents.
    • Devices with alternating gratings showed higher slope efficiencies compared to third-order symmetric gratings with similar coupling coefficients.

    Conclusions:

    • Alternating grating designs in DFB lasers offer significant advantages in fabrication and performance.
    • This approach leads to more efficient and potentially lower-cost laser devices.
    • The findings pave the way for improved integrated photonic devices.