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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Compact linear polarization spectrometer based on radiation mode shaped in-fiber diffraction grating.

Huabao Qin, Qinyun He, Yarien Moreno

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    We developed a compact fiber spectrometer using a polarization-dependent diffraction grating. This device achieves high resolution and a wide wavelength range, integrating polarization and spectral analysis for enhanced measurements.

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    Area of Science:

    • Optical Engineering
    • Spectroscopy
    • Fiber Optics

    Background:

    • Traditional spectrometers often lack integrated polarization analysis capabilities.
    • In-fiber devices offer miniaturization potential for optical sensing systems.

    Purpose of the Study:

    • To introduce a novel compact linear polarization spectrometer.
    • To enhance spectrometer performance through beam profile shaping.
    • To demonstrate polarization-sensitive spectral analysis.

    Main Methods:

    • Utilizing an in-fiber polarization-dependent diffraction grating.
    • Shaping the grating's radiated light beam profile to a Gaussian.
    • Measuring transmission spectra of an excessively tilted fiber grating.

    Main Results:

    • Achieved a spectral resolution of 0.05 nm.
    • Demonstrated a wavelength response range of 115 nm (1495 nm to 1610 nm).
    • Reduced focused light spot size from 44 µm to 33 µm via beam shaping.

    Conclusions:

    • The proposed fiber spectrometer integrates polarization and spectral analysis functions.
    • The device exhibits excellent wavelength consistency and polarization characteristics.
    • This compact spectrometer offers a polarization-sensitive analysis method for optical measurements.