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Simplex coded polarization optical time domain reflectometry system.

Chaodong Wang, Ruolin Liao, Wenbo Chen

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    |April 7, 2017
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    Summary
    This summary is machine-generated.

    A new Simplex coded polarization optical time domain reflectometry (POTDR) system improves signal-to-noise ratio (SNR) without degrading the degree of polarization (DOP). This enhances dynamic range for precise detection of mechanical events in fiber links.

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    Area of Science:

    • Optical Engineering
    • Fiber Optic Sensing
    • Signal Processing

    Background:

    • Polarization optical time domain reflectometry (POTDR) systems face performance limitations due to low signal-to-noise ratio (SNR) and degraded degree of polarization (DOP).
    • Weak Rayleigh backscattering and signal light depolarization hinder accurate polarimetric measurements in POTDR.

    Purpose of the Study:

    • To propose and demonstrate a Simplex coded POTDR (sc-POTDR) system to enhance SNR and maintain DOP.
    • To investigate the impact of Simplex code parameters on signal DOP and temporal depolarization.
    • To achieve a sufficient dynamic range for detecting mechanical events in long fiber links.

    Main Methods:

    • Development and simulation of a Simplex coded POTDR system.
    • Analysis of the relationships between Simplex code length/bit width and signal DOP.
    • Experimental validation of the sc-POTDR system performance, including coding gain and depolarization suppression.

    Main Results:

    • Simplex code length does not affect signal DOP; temporal depolarization is suppressed by reducing bit width.
    • A 511-bit Simplex code achieved a coding gain of 10.125 dB.
    • The sc-POTDR system successfully detected and precisely located polarization state changes from mechanical events in a long fiber link.

    Conclusions:

    • The proposed sc-POTDR system effectively enhances SNR and preserves DOP, overcoming key limitations of traditional POTDR.
    • Simplex coding, particularly with reduced bit width, offers a viable strategy for improving POTDR performance.
    • This advancement enables more sensitive and accurate monitoring of fiber optic networks for mechanical disturbances.