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Compact monolithic high-power narrow-linewidth multi-wavelength DFB laser array for optical I/O applications.

Yue Zhang, Shenghong Xie, Zhenxing Sun

    Optics Express
    |February 20, 2026
    PubMed
    Summary

    We developed a compact four-wavelength distributed feedback (DFB) laser array for DWDM optical I/O. This laser offers high output power and excellent uniformity, making it ideal for high-speed data transmission.

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    Area of Science:

    • Photonics and Optical Engineering
    • Semiconductor Lasers
    • Integrated Optics

    Background:

    • Dense Wavelength Division Multiplexing (DWDM) systems require compact, high-power, and power-balanced light sources.
    • Existing laser arrays often face challenges with output power, uniformity, and integration.

    Purpose of the Study:

    • To propose and demonstrate a novel compact monolithic four-wavelength distributed feedback (DFB) laser array.
    • To achieve high output power, excellent power uniformity, and precise wavelength control for DWDM applications.

    Main Methods:

    • Utilized a parallel laser connection with a two-stage Y-branch combiner for wavelength merging.
    • Integrated a semiconductor optical amplifier (SOA) for power boosting.
    • Employed the reconstruction equivalent chirp (REC) technique for wavelength control and a slab-coupled optical waveguide (SCOW) structure for low loss and single-mode operation.

    Main Results:

    • Achieved output powers exceeding 100 mW per wavelength with < 0.039 nm wavelength deviation.
    • Demonstrated side-mode suppression ratios > 35 dB and linewidths < 530 kHz.
    • Obtained relative intensity noise (RIN) below -145 dB/Hz and clear 25 Gb/s NRZ eye diagrams.

    Conclusions:

    • The demonstrated laser array is a promising high-power, narrow-linewidth, and power-balanced light source.
    • The device is suitable for demanding DWDM optical input/output (I/O) applications.
    • The integrated design and advanced techniques ensure high performance and reliability.