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    A novel lock-in detection technique improves signal-to-noise ratio for digital phase-generated carrier (PGC) demodulators. This method enhances efficiency by avoiding multipliers and offers superior noise performance compared to traditional techniques.

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    Area of Science:

    • Optoelectronics
    • Signal Processing
    • Interferometry

    Background:

    • Digital phase-generated carrier (PGC) demodulators are crucial for interference phase demodulation.
    • Traditional lock-in techniques can be limited by multiplier usage and noise sensitivity.

    Purpose of the Study:

    • To propose a simplified lock-in detection technique for digital PGC demodulators.
    • To enhance algorithm efficiency and improve signal-to-noise ratio (SNR).

    Main Methods:

    • Mixing interference signals with rectangular waves containing specific carrier harmonics.
    • Theoretical analysis of noise performance (light intensity variation, circuit noise).
    • Simulation and experimental verification using a fiber-optic Michelson interferometer.

    Main Results:

    • The proposed technique avoids the need for multipliers, increasing efficiency.
    • Theoretical analysis and simulations confirm a better SNR compared to traditional methods.
    • Experimental demonstration validates the technique's feasibility in a fiber-optic interferometer.

    Conclusions:

    • The developed lock-in detection method offers improved performance for PGC demodulators.
    • It provides a more efficient and robust approach to interference phase demodulation.
    • The technique is suitable for applications requiring high SNR and simplified hardware.