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Optical low-coherence reflectometer for differential phase measurement.

D P Davé, T E Milner

    Optics Letters
    |December 7, 2007
    PubMed
    Summary
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    This study presents a dual-channel optical low-coherence reflectometer using birefringent fiber. The system accurately measures phase differences by canceling environmental noise, demonstrating high sensitivity.

    Area of Science:

    • Optics and Photonics
    • Fiber Optics Sensing

    Background:

    • Optical low-coherence reflectometry (OLCR) is a technique for high-resolution optical ranging.
    • Environmental perturbations can introduce phase noise in optical measurements, limiting accuracy.
    • Differential phase measurement requires precise comparison between two optical signals.

    Purpose of the Study:

    • To develop a birefringent-fiber-based dual-channel optical low-coherence reflectometer.
    • To achieve accurate differential phase measurement by canceling common-mode phase noise.
    • To demonstrate the system's accuracy and sensitivity for spatially separated measurements.

    Main Methods:

    • Utilizing a birefringent fiber to create two distinct optical channels.
    • Implementing a dual-channel configuration for simultaneous signal acquisition.

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  • Employing common-mode noise cancellation techniques for differential phase extraction.

    • Main Results:

    • Successful cancellation of phase noise from environmental perturbations.
    • Accurate measurement of the phase difference between light backscattered from two sites.
    • Demonstration of high sensitivity in the differential phase measurements.

    Conclusions:

    • The developed birefringent-fiber OLCR system enables precise differential phase measurements.
    • Common-mode noise cancellation is effective in improving measurement accuracy.
    • The system shows potential for various applications requiring sensitive optical phase detection.