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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Quantitative amplitude measuring φ-OTDR using multiple uncorrelated Rayleigh backscattering realizations.

Brandon Redding, Matthew J Murray, Allen Davis

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    |December 28, 2019
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    Summary

    This study introduces a novel quantitative strain sensing technique using modified phase-sensitive optical time-domain reflectometry (φ-OTDR). The method overcomes non-linear responses in Rayleigh backscattered light, enabling precise strain measurements.

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    Area of Science:

    • Optical Engineering
    • Sensing Technology
    • Materials Science

    Background:

    • Standard phase-sensitive optical time-domain reflectometry (φ-OTDR) struggles with quantitative strain measurements due to non-linear Rayleigh backscatter amplitude.
    • Existing methods lack the precision required for accurate strain quantification.

    Purpose of the Study:

    • To develop a quantitative strain sensing technique using Rayleigh backscattered light in a modified φ-OTDR system.
    • To overcome the inherent non-linear strain response limitations of conventional φ-OTDR sensors.

    Main Methods:

    • A modified φ-OTDR system was developed, incorporating frequency and polarization multiplexing.
    • The system recorded 18 uncorrelated Rayleigh backscattering measurements in parallel.
    • A computational technique was employed to recover a linear strain response from the multiple measurements.

    Main Results:

    • The developed sensor demonstrated a linear strain response with total harmonic distortion below -35 dB.
    • The system achieved immunity to signal fading.
    • A minimum detectable strain of 5 pɛ/√Hz and a bandwidth of 500 kHz were realized.

    Conclusions:

    • The proposed technique enables accurate quantitative strain sensing by computationally processing multiple Rayleigh backscattering measurements.
    • This advancement offers a robust and sensitive solution for strain monitoring applications.