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Geometric phase in distributed fiber optic sensing.

Sabahat Shaheen, Konstantin Hicke

    Optics Letters
    |August 1, 2022
    PubMed
    Summary
    This summary is machine-generated.

    This study presents the first measurement of geometric phase in optical fiber beat signals. This breakthrough enables novel distributed fiber sensing techniques by analyzing light beam interference.

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    Area of Science:

    • Optics and Photonics
    • Fiber Optic Sensing
    • Quantum Phase

    Background:

    • Coherent interference of frequency-offset light beams generates beat signals containing geometric phase information.
    • Measuring geometric phase in optical fibers is challenging due to dynamic intensity variations.
    • Previous research has not reported measurements of geometric phase within a fiber optic medium.

    Purpose of the Study:

    • To measure the geometric phase in the beat signal from coherent interference of two frequency-offset light beams.
    • To demonstrate a novel distributed optical fiber sensing setup for geometric phase measurement.
    • To explore the potential of this measurement for new sensing applications.

    Main Methods:

    • A novel distributed optical fiber sensing setup was developed.
    • The setup utilized coherent interference of two frequency-offset light beams.
    • Experimental stimuli included a 100-Hz sinusoidal stimulus applied to a polarization scrambler and a piezoelectric transducer.

    Main Results:

    • The geometric phase in the beat signal was successfully measured for the first time in a fiber optic medium.
    • Measurements were performed under conditions of changing beam intensities.
    • The influence of applied sinusoidal stimuli on the phase was experimentally verified.

    Conclusions:

    • The successful measurement of geometric phase in optical fiber beat signals is a significant advancement.
    • The developed sensing setup shows promise for novel distributed fiber sensing techniques.
    • This work opens avenues for advanced optical sensing applications leveraging geometric phase.