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Updated: Mar 1, 2026

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Hybrid integrated narrow linewidth laser based on high-order SiO2 planar waveguide grating.

Guojie Zhang, Yao Zhang, Liyong Guo

    Optics Letters
    |February 27, 2026
    PubMed
    Summary

    We developed a novel hybrid laser using a semiconductor optical amplifier and a silica waveguide grating. This laser achieves high power and narrow linewidth, overcoming traditional tradeoffs for mass production.

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    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science

    Background:

    • External cavity diode lasers are crucial for applications requiring narrow linewidth and high power.
    • Traditional designs often face a trade-off between output power and spectral linewidth.
    • Integrated photonic platforms offer miniaturization and scalability for laser devices.

    Purpose of the Study:

    • To propose and demonstrate a hybrid integrated external cavity laser.
    • To achieve high output power and narrow linewidth simultaneously.
    • To resolve the conventional linewidth-power trade-off in laser design.

    Main Methods:

    • Integration of a reflective semiconductor optical amplifier (ROA) chip.
    • Utilizing a high-order silicon dioxide (SiO2)-based planar waveguide grating (SPWG).

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  • Fabrication on a low-loss commercial SiO2 platform.

    • Main Results:

    • Demonstrated a single longitudinal mode laser.
    • Achieved 55 mW output power at 300 mA pump current.
    • Measured a Lorentzian linewidth of 614 Hz.
    • Recorded relative intensity noise (RIN) of -165 dBc/Hz from 100 MHz to 250 MHz.

    Conclusions:

    • The hybrid laser design overcomes the traditional linewidth-power trade-off.
    • The use of a simple high-order SPWG structure on a SiO2 platform enables high-performance lasers.
    • This approach is suitable for mass production, offering a practical solution for advanced laser applications.