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Distributed Brillouin sensor system based on offset locking of two distributed feedback lasers.

Yun Li1, Xiaoyi Bao, Fabien Ravet

  • 1Department of Physics, University of Ottawa, Ottawa, Ontario, Canada.

Applied Optics
|January 12, 2008
PubMed
Summary

A novel offset locking technique enhances distributed Brillouin sensing. This method uses an optical delay line and PID controller for precise laser frequency tuning, improving measurement accuracy and resolution over long distances.

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Area of Science:

  • Optoelectronics
  • Fiber Optic Sensing
  • Laser Physics

Background:

  • Distributed Brillouin sensing systems require precise laser frequency control for accurate measurements.
  • Existing methods face limitations in tuning range, speed, and independence from laser parameters.

Purpose of the Study:

  • To introduce and validate a novel offset locking technique for distributed Brillouin sensor systems.
  • To enhance the performance of Brillouin sensors in terms of tuning range, speed, and accuracy.

Main Methods:

  • Implementation of an offset locking technique using an external optical delay line for laser frequency tuning.
  • Utilization of a proportional-integral-derivative (PID) controller for precise frequency locking.
  • Phase locking of two distributed feedback (DFB) lasers at the Brillouin frequency.

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  • Employing a lock-in amplifier to control the electro-optic modulator bias.

    • Main Results:

    • Achieved a large tuning range (>1 GHz) and high tuning speed (<100 μs per step).
    • Demonstrated a high signal-to-noise ratio (32 dB) enabling 1 m spatial resolution.
    • Obtained frequency measurement accuracy better than 0.6 MHz over kilometer-long sensing distances.
    • Achieved temperature resolution of 0.5°C and strain resolution of 8 με.

    Conclusions:

    • The proposed offset locking technique significantly improves distributed Brillouin sensor performance.
    • This method offers a robust solution for high-accuracy, long-range sensing applications.
    • The technique provides independent control over laser frequency tuning, enhancing system versatility.