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Switchable multi-wavelength Tm-doped mode-locked fiber laser.

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    We demonstrate a novel switchable tri-wavelength fiber laser using nonlinear polarization evolution (NPE). This ultrafast laser offers binary control for three bits, enabling applications in optical communications.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Fiber Optics

    Background:

    • Mode-locked fiber lasers are crucial for ultrafast applications.
    • Achieving multi-wavelength operation and switchability in fiber lasers presents challenges.
    • Nonlinear polarization evolution (NPE) is a key technique for controlling laser dynamics.

    Purpose of the Study:

    • To propose and demonstrate a novel switchable tri-wavelength ultrafast fiber laser.
    • To investigate the use of nonlinear polarization evolution (NPE) for multi-wavelength mode-locking.
    • To achieve binary control of laser output for potential communication applications.

    Main Methods:

    • Utilizing a thulium-doped fiber laser cavity.
    • Implementing the nonlinear polarization evolution (NPE) technique.
    • Controlling polarization states within the fiber ring cavity to induce wavelength-dependent loss.

    Main Results:

    • Successfully demonstrated a switchable tri-wavelength Tm-doped ultrafast fiber laser.
    • NPE induced wavelength-dependent loss, leading to inhomogeneous effective gain.
    • Achieved binary control of three bits by manipulating intra-cavity polarization.

    Conclusions:

    • The developed laser architecture enables switchable multi-wavelength operation.
    • The inhomogeneous gain profile is key to achieving multi-wavelength mode-locking.
    • This switchable laser technology holds promise for optical signal processing and communication systems.