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Raman-assisted phase sensitive amplifier using a fiber Bragg grating-based tunable phase shifter.

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    This study demonstrates a low-loss Raman-assisted phase sensitive amplifier (PSA) achieving ~20 dB gain. The novel design enhances receiver sensitivity by up to 4 dB for high-speed optical communication signals.

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    Area of Science:

    • Optoelectronics
    • Optical Amplification

    Background:

    • Phase sensitive amplification (PSA) is crucial for enhancing receiver sensitivity in optical communication systems.
    • Traditional PSAs often suffer from high component losses and limited gain adjustment capabilities.

    Purpose of the Study:

    • To experimentally demonstrate a low-loss Raman-assisted phase sensitive amplifier (PSA).
    • To investigate the effectiveness of non-uniform Raman gain and tunable fiber Bragg gratings (FBGs) for amplitude and phase control in the PSA.
    • To evaluate the performance enhancement in terms of signal gain and receiver sensitivity for advanced modulation formats.

    Main Methods:

    • Utilized non-uniform Raman gain to adjust signal amplitude.
    • Employed a tunable fiber Bragg grating (FBG) for precise phase control.
    • Experimentally measured the net signal gain and component losses of the developed PSA system.
    • Tested the PSA with 20 and 25 Gbaud quadrature phase shift keying (QPSK) and 10 Gbaud 16-quadrature amplitude modulation (16-QAM) signals.

    Main Results:

    • Achieved a signal net gain of approximately 20 dB with a total component loss of around 8 dB.
    • Demonstrated up to 5.6 dB signal gain improvement by tuning the FBG central wavelength.
    • Observed approximately 4 dB receiver sensitivity enhancement for the tested high-speed signals.

    Conclusions:

    • The developed Raman-assisted PSA offers a practical solution for low-loss signal amplification.
    • The system effectively improves receiver sensitivity, enabling more robust high-speed optical communications.
    • The combination of non-uniform Raman gain and tunable FBGs provides efficient amplitude and phase control for PSA.