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Updated: Feb 21, 2026

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Over 300 mW O-band 8-channel DFB laser array for optical I/O technology.

Shenghong Xie, Bocang Qiu, Zhenxing Sun

    Optics Express
    |February 20, 2026
    PubMed
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    This study demonstrates a high-power distributed feedback laser array for optical interconnects. The novel design achieves over 300 mW per channel, ensuring stable single-mode operation for high-speed data transmission.

    Area of Science:

    • Photonics
    • Semiconductor Lasers
    • Optical Communications

    Background:

    • Optical input/output (I/O) applications require high-power, stable laser sources.
    • Existing laser technologies face limitations in power, efficiency, and single-mode operation for demanding I/O tasks.

    Purpose of the Study:

    • To demonstrate a high-power distributed feedback (DFB) laser array optimized for optical I/O.
    • To improve single-transverse-mode characteristics and reduce internal loss in DFB lasers.
    • To achieve stable single-longitudinal-mode operation with high power output per channel.

    Main Methods:

    • Fabrication of a DFB laser array incorporating a high-refractive-index layer in the N-doped region.
    • Implementation of an asymmetric π-phase-shift using the reconstruction-equivalent chirp technique.

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  • Characterization of output power, single-mode yield, spectral properties, and noise performance.

    • Main Results:

    • Achieved single-mode operation at a 5 µm ridge width with low internal loss (3 cm⁻¹).
    • Demonstrated output powers exceeding 300 mW per channel at 25 °C and 800 mA injection current.
    • Exhibited stable single-longitudinal-mode operation with side mode suppression ratios > 50 dB and low relative intensity noise (-154 dB/Hz).

    Conclusions:

    • The developed DFB laser array is suitable for high-power optical I/O applications.
    • The epitaxial design and phase-shift technique enable high single-mode yield and stable operation.
    • The laser array shows strong potential for enabling high-speed optical interconnects.