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Single-frequency erbium-doped fiber laser based on self-injection feedback.

Jun Yang, Huiping Chen, Shuxiang Song

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    |November 14, 2024
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    This study presents a novel single-frequency erbium-doped fiber laser. The laser utilizes self-injection feedback to achieve a narrow linewidth and suppressed noise for enhanced performance.

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    Area of Science:

    • Photonics and Laser Technology
    • Optical Engineering

    Background:

    • Erbium-doped fiber lasers are crucial for various applications.
    • Achieving stable, narrow linewidth, and low-noise single-frequency output remains a challenge.

    Purpose of the Study:

    • To develop a single-frequency erbium-doped fiber laser with enhanced stability and reduced noise.
    • To investigate the effectiveness of self-injection feedback combined with additional components for noise suppression.

    Main Methods:

    • Constructed a resonant cavity using broadband fiber Bragg gratings and erbium-doped fiber.
    • Implemented self-injection feedback with a narrowband fiber Bragg grating and single-mode fiber.
    • Incorporated a saturated double-pass amplifier and saturable absorber into the feedback loop.

    Main Results:

    • Achieved a stable, narrow linewidth single-frequency laser output of approximately 270 Hz.
    • Significantly suppressed relative intensity noise and phase noise by approximately 18.08 dB.
    • Reduced phase noise to 36.7 dBc·Hz-1 and increased edge-mode rejection ratio by 13 dB.
    • Obtained an output power of 8.5 dBm.

    Conclusions:

    • The proposed self-injection feedback configuration effectively suppresses noise and enhances the performance of erbium-doped fiber lasers.
    • The integration of a saturated amplifier and saturable absorber is key to achieving low noise and narrow linewidth.
    • This laser design offers a promising solution for applications requiring high-quality single-frequency light sources.