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Optical pulse compression reflectometry: proposal and proof-of-concept experiment.

Weiwen Zou, Shuo Yang, Xin Long

    Optics Express
    |April 4, 2015
    PubMed
    Summary

    This study introduces optical pulse compression reflectometry (OPCR), a new method using frequency modulation pulse compression. OPCR enhances spatial resolution and measurement range beyond conventional optical time domain reflectometry limitations.

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    Area of Science:

    • Photonics and Optical Engineering
    • Signal Processing

    Background:

    • Conventional optical time domain reflectometry (OTDR) faces a trade-off between spatial resolution and measurement range.
    • Limitations in existing reflectometry techniques necessitate advancements for improved performance.

    Purpose of the Study:

    • To propose and demonstrate a novel reflectometry technique, optical pulse compression reflectometry (OPCR).
    • To overcome the inherent limitations of conventional pulse-based OTDR regarding spatial resolution and measurement range.

    Main Methods:

    • Implementation of OPCR using linear frequency modulation (LFM) pulse-compression technology.
    • Theoretical analysis of OPCR's working principle, including spatial resolution determined by LFM sweeping range.
    • Investigation of laser phase noise effects on side lobe ratios and the application of time averaging for range extension.

    Main Results:

    • Achieved spatial resolution independent of pulse width, determined by the LFM sweeping range.
    • Demonstrated extended measurement range beyond the source's coherent length due to continuous acquisition and time averaging.
    • Proof-of-concept experiment successfully verified the enhanced spatial resolution and measurement range of OPCR.

    Conclusions:

    • OPCR offers a significant advancement over conventional OTDR by decoupling spatial resolution from pulse width.
    • The technique effectively mitigates the impact of laser phase noise, enabling longer measurement ranges.
    • OPCR presents a promising new tool for high-performance optical sensing and reflectometry applications.