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Ultra-wideband matrix DFB laser array based on enhanced self-heating effect.

Yaqiang Fan, Zhenxing Sun, Yue Zhang

    Optics Express
    |August 13, 2025
    PubMed
    Summary
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    Chemical communications (Cambridge, England)·2026

    This study presents an ultra-wideband distributed feedback (DFB) laser array with enhanced self-heating for precise wavelength control. The novel design achieves a 60 nm tuning range, ideal for DWDM and optical sensing applications.

    Area of Science:

    • Photonics and Semiconductor Lasers
    • Integrated Optics
    • Optoelectronic Devices

    Background:

    • Distributed feedback (DFB) lasers are crucial for optical communication systems.
    • Achieving precise wavelength control and wide tuning ranges in integrated laser arrays remains a challenge.
    • Existing fabrication methods can be complex and limit performance.

    Purpose of the Study:

    • To propose and demonstrate an ultra-wideband DFB laser array with enhanced self-heating for improved performance.
    • To achieve precise wavelength control and a wide continuous tuning range in a monolithic laser array.
    • To simplify fabrication complexity compared to traditional methods.

    Main Methods:

    • Monolithic integration of a 4x3 matrix array of 12 DFB lasers.

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  • Utilizing the reconstruction-equivalent-chirp technique for grating fabrication and wavelength spacing control.
  • Employing a cascaded Y-branch for single waveguide output and integrating a semiconductor optical amplifier (SOA).
  • Optimizing p-waveguide doping to enhance the self-heating effect for increased wavelength current tuning range.

    • Main Results:

    • Demonstrated a 4x3 DFB laser array with 5 nm wavelength spacing and precise control (±0.2 nm deviation).
    • Achieved a wavelength current tuning range of 5.8 nm per laser unit.
    • Obtained a continuous tuning range of 60 nm for the array without thermoelectric cooler (TEC) adjustment.
    • Reported output power >55 mW, RIN < -130 dB/Hz, and SMSR > 45 dB.

    Conclusions:

    • The enhanced self-heating effect in DFB lasers enables precise wavelength control and wide tuning ranges.
    • The proposed matrix DFB laser array offers reduced fabrication complexity and high performance.
    • This tunable laser technology is highly suitable for dense wavelength-division multiplexing (DWDM) and optical sensing systems.