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Incoherent frequency modulated cw optical reflectometry with centimeter resolution.

S Venkatesh, D W Dolfi

    Applied Optics
    |June 22, 2010
    PubMed
    Summary

    This study introduces an advanced optical reflectometer for precise fiber optic measurements. It achieves 6.8 cm resolution and a 50-dB dynamic range, enhancing signal analysis capabilities.

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    Area of Science:

    • Optoelectronics
    • Fiber Optics
    • Signal Processing

    Background:

    • Accurate measurement of optical fiber parameters is crucial for telecommunications and sensing.
    • Existing reflectometry techniques face limitations in resolution and dynamic range.

    Purpose of the Study:

    • To develop and characterize a novel incoherent, frequency modulated continuous wave (FMCW) optical reflectometer.
    • To achieve high-resolution and wide dynamic range measurements in optical fibers.

    Main Methods:

    • Utilized a broadband Lithium Niobate (LiNbO3) electrooptic modulator for frequency modulation.
    • Employed a slow photodiode for optical downconversion and detection.
    • Implemented a waveform recorder for digital spectrum analysis of the FMCW signal.

    Main Results:

    • Achieved a two-point resolution of 6.8 cm in optical fiber.
    • Demonstrated an optical dynamic range of 50 dB, defined by the system noise floor relative to the maximum signal.

    Conclusions:

    • The developed incoherent FMCW optical reflectometer offers significant improvements in measurement precision.
    • This technology has potential applications in high-performance fiber optic sensing and characterization.

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