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A laterally-coupled distributed feedback laser with equivalent quarter-wave phase shift.

Jingsi Li, Julian Cheng

    Optics Express
    |November 13, 2013
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed a novel quarter-wave phase shifted distributed feedback (DFB) laser using interference lithography. This cost-effective method simplifies fabrication for stable, precise laser wavelengths in integrated photonic circuits.

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    Area of Science:

    • Photonics
    • Semiconductor Lasers
    • Integrated Optics

    Background:

    • Distributed feedback (DFB) lasers are crucial for precise wavelength control in optical communications.
    • Achieving a quarter-wave phase shift is essential for high-performance DFB lasers but often requires complex fabrication.
    • Existing methods for quarter-wave phase shift DFB lasers can be costly and involve multiple fabrication steps.

    Purpose of the Study:

    • To demonstrate the first laterally-coupled distributed feedback (LC-DFB) laser incorporating a quarter-wave equivalent phase shift (EPS).
    • To utilize interference lithography (IL) and conventional photolithography for fabricating the EPS.
    • To present a simplified, low-cost manufacturing approach for high-performance DFB lasers.

    Main Methods:

    • Fabrication of a quarter-wave EPS using interference lithography (IL) and conventional photolithography.
    • Integration of a specially designed sampled grating on both sidewalls of a ridge waveguide.
    • Characterization of the laser's performance, including single-mode operation and side mode suppression ratio (SMSR).

    Main Results:

    • Stable single-mode lasing operation was achieved across a broad range of injection currents.
    • A high side mode suppression ratio (SMSR) of 41.1 dB was recorded.
    • The fabricated LC-DFB laser demonstrated high performance with a quarter-wave EPS.

    Conclusions:

    • The developed method offers a practical and low-cost approach to fabricating quarter-wave phase shifted DFB lasers.
    • This technique eliminates the need for epitaxial regrowth and electron-beam lithography, simplifying manufacturing.
    • The simplified fabrication process facilitates the production of DFB lasers with stable and precise wavelengths, suitable for single devices and photonic integrated circuits.