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Tunable multiwavelength Tm-doped fiber laser based on the multimode interference effect.

Peng Zhang, Tianshu Wang, Wanzhuo Ma

    Applied Optics
    |July 21, 2015
    PubMed
    Summary
    This summary is machine-generated.

    A novel tunable multiwavelength thulium-doped fiber laser (TDFL) operating at 2 µm was developed using multimode interference (MMI). This laser system achieves up to three wavelengths, tunable over a 24 nm range.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Fiber Optics

    Background:

    • Thulium-doped fiber lasers (TDFLs) are crucial for applications in the 2 µm spectral region.
    • Achieving stable, tunable multiwavelength operation in TDFLs remains a significant challenge.

    Purpose of the Study:

    • To propose and experimentally demonstrate a simple, tunable multiwavelength TDFL.
    • To utilize multimode interference (MMI) for wavelength selection and tuning.

    Main Methods:

    • A 4 m Tm-doped single-mode fiber laser was pumped by a 1568 nm laser.
    • A single-mode-multimode-single-mode (SMS) fiber structure served as an MMI filter.
    • Wavelength tuning was achieved by adjusting a polarization controller and rotating the multimode fiber within the SMS structure.

    Main Results:

    • The laser successfully operated at up to three distinct wavelengths.
    • A tuning range of approximately 24 nm (1892-1916 nm) was achieved.
    • A high side-mode suppression ratio (SMSR) of ~54 dB and a narrow 3 dB linewidth (<0.04 nm) were recorded.
    • Power fluctuation at each wavelength was found to be less than 3 dB.

    Conclusions:

    • The proposed MMI-based TDFL offers a simple and effective method for achieving tunable multiwavelength operation.
    • The demonstrated laser exhibits excellent wavelength tunability, stability, and spectral characteristics.
    • This laser system has potential for various applications requiring precise wavelength control in the 2 µm band.