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Updated: Jan 8, 2026

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Single code pseudo-random quadrature phase shifting homodyne interferometry.

Anneshwa Dey, Paul G Sibley, Malcolm B Gray

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    Summary
    This summary is machine-generated.

    This study introduces a novel single-code modulation for digital homodyne interferometry, simplifying phase recovery. The new method achieves high optical sensitivity, advancing precision measurement techniques.

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    Area of Science:

    • Optics and Photonics
    • Signal Processing

    Background:

    • Traditional digital homodyne interferometry uses dual pseudo-random noise codes for quadrature phase shifting modulation.
    • This enables simultaneous recovery of interference phase and time-of-flight range gating.

    Purpose of the Study:

    • To propose and validate a simplified
    • single-code
    • modulation scheme for digital homodyne interferometry.
    • To retain the necessary 4-level phase step for double modulated homodyne detection.

    Main Methods:

    • Generation of a single m-sequence pseudo-random noise code for modulation.
    • Numerical verification of the m-sequence autocorrelation profile preservation.
    • Experimental characterization of phase recovery performance and relative intensity noise coupling.

    Main Results:

    • The single-code modulation scheme successfully retains the m-sequence autocorrelation profile.
    • Experimental characterization confirmed effective phase recovery.
    • An optical sensitivity of 3 µrad/√Hz was demonstrated.

    Conclusions:

    • The proposed single-code modulation scheme simplifies digital homodyne interferometry.
    • It maintains performance while reducing complexity.
    • This advancement offers potential for more efficient and sensitive optical measurement systems.