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Electro-optic modulator feedback control in phase-sensitive optical time-domain reflectometer distributed sensor.

Xiaonan Hui, Shilie Zheng, Jinhai Zhou

    Applied Optics
    |February 12, 2014
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    Summary

    This study introduces a new method to control electro-optic modulators (EOMs) in distributed sensor systems. It uses OTDR curve data for feedback control, ensuring stable, long-term high extinction ratios.

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    Area of Science:

    • Optoelectronics
    • Fiber Optic Sensing
    • Signal Processing

    Background:

    • Phase-sensitive optical time-domain reflectometry (ϕ-OTDR) systems rely on electro-optic modulators (EOMs) for accurate measurements.
    • Maintaining optimal EOM performance, specifically a high extinction ratio, is crucial for sensor system reliability.
    • Traditional EOM control methods often require separate modules and can be susceptible to drift and bias point shifts.

    Purpose of the Study:

    • To develop a novel, integrated control method for EOMs within ϕ-OTDR systems.
    • To eliminate the need for independent EOM control modules by leveraging existing system data.
    • To enhance the long-term stability and performance of EOMs in distributed sensing applications.

    Main Methods:

    • A new control strategy for EOMs in ϕ-OTDR systems is proposed.
    • The relationship between the optical time-domain reflectometer (OTDR) curve's accumulation value and the EOM's extinction ratio is mathematically defined.
    • This relationship is utilized to implement a feedback control loop for the EOM, using OTDR data directly.

    Main Results:

    • Experimental validation demonstrates the effectiveness of the proposed feedback control method.
    • The method successfully compensates for EOM drift, maintaining a high extinction ratio over extended periods.
    • The control strategy also proves capable of rectifying small jumps in the EOM's bias point.

    Conclusions:

    • The novel method offers an efficient and integrated approach to EOM control in ϕ-OTDR systems.
    • By utilizing OTDR curve data, the system achieves improved stability and reliability.
    • This technique enhances the operational longevity and accuracy of distributed fiber optic sensing systems.