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Experimental analysis of degenerate vector phase-sensitive amplification.

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    We explored a degenerate vector phase-sensitive amplifier (PSA). This vector PSA shows gain sensitivity to pump polarization and offers improved pump depletion tolerance compared to scalar schemes.

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    Area of Science:

    • Optics and Photonics
    • Nonlinear Optics
    • Fiber Optics

    Background:

    • Phase-sensitive amplifiers (PSAs) are crucial for low-noise signal amplification.
    • Vectorial analysis of PSAs is necessary to understand polarization effects.
    • Polarization mode dispersion (PMD) can impact the performance of optical amplifiers.

    Purpose of the Study:

    • To investigate the performance of a degenerate vector phase-sensitive amplifier (PSA).
    • To analyze the gain dependence on pump-signal phase and polarization.
    • To compare the vector PSA with scalar schemes regarding pump depletion tolerance.

    Main Methods:

    • Theoretical analysis of a degenerate vector PSA.
    • Experimental characterization of gain performance.
    • Investigation of polarization mode dispersion effects on pump states of polarization (SOP).

    Main Results:

    • Gain dependence on relative phase and polarization angle was determined.
    • Vector PSA sensitivity to pump SOP due to fiber PMD was observed.
    • An on-off gain exceeding 10 dB was achieved under specific pump SOPs.
    • The vector scheme demonstrated greater tolerance to pump depletion than scalar schemes.

    Conclusions:

    • The degenerate vector PSA performance aligns well with theoretical predictions under optimal conditions.
    • Vector PSA offers advantages in handling pump depletion, crucial for nonlinear optical systems.
    • Understanding polarization effects is key for optimizing PSA performance in fiber optic applications.