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Updated: Jul 31, 2025

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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High-power tapered two-section distributed feedback laser based on a chirped sampled grating.

Yuxin Ma, Hantian Ge, Zhenxing Sun

    Applied Optics
    |May 3, 2023
    PubMed
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    We developed a high-power distributed feedback (DFB) laser with three equivalent phase shifts. This novel DFB laser design achieves higher output power, benefiting applications like wavelength division multiplexing and gas sensing.

    Area of Science:

    • Photonics
    • Semiconductor Lasers
    • Optical Engineering

    Background:

    • Distributed feedback (DFB) lasers are crucial for optical communication and sensing.
    • Enhancing output power and maintaining single-mode stability in DFB lasers remains a key challenge.
    • Existing DFB laser designs often face limitations in power scalability.

    Purpose of the Study:

    • To propose and theoretically investigate a novel two-section distributed feedback (DFB) laser architecture.
    • To enhance the output power of DFB lasers while ensuring stable single-mode operation.
    • To explore the potential benefits of the proposed design for advanced photonic applications.

    Main Methods:

    • Theoretical study of a two-section DFB laser incorporating three equivalent phase shifts (3EPSs).

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  • Introduction of a tapered waveguide with a chirped sampled grating for power amplification.
  • Numerical simulation to evaluate laser performance metrics including output power and side mode suppression ratio (SMSR).

    • Main Results:

    • The proposed 1200 µm length two-section DFB laser achieved a maximum output power of 306.5 mW.
    • A side mode suppression ratio (SMSR) as high as 40 dB was demonstrated.
    • Stable single-mode operation was maintained through the integrated tapered waveguide and chirped sampled grating.

    Conclusions:

    • The proposed three equivalent phase shifts (3EPSs) DFB laser design significantly increases output power compared to traditional DFB lasers.
    • The enhanced power output and stable single-mode operation make this laser suitable for demanding applications.
    • Potential applications include wavelength division multiplexing (WDM) systems, gas sensors, and large-scale silicon photonics integration.