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High-resolution DPP-BOTDA over 50 km LEAF using return-to-zero coded pulses.

Hao Liang1, Wenhai Li, Nicolas Linze

  • 1Fiber Optics Group, Department of Physics, University of Ottawa, Ottawa, Ontario K1N6N5, Canada.

Optics Letters
|May 19, 2010
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Summary
This summary is machine-generated.

This study demonstrates that coded optical probe pulses in return-to-zero (RZ) format improve long-range distance sensing using differential pulse-width pair Brillouin optical time-domain analysis (DPP-BOTDA), achieving higher accuracy and resolution.

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Area of Science:

  • Fiber optic sensing
  • Optical metrology
  • Signal processing

Background:

  • Brillouin optical time-domain analysis (BOTDA) is a key technique for distributed fiber optic sensing.
  • Traditional BOTDA methods face limitations in spatial resolution and measurement accuracy over long distances.
  • Coded pulse formats offer potential for enhanced sensing performance.

Purpose of the Study:

  • To investigate the effectiveness of coded optical probe pulses in return-to-zero/non-return-to-zero (RZ/NRZ) formats for long-range DPP-BOTDA.
  • To enhance spatial resolution and measurement accuracy in distributed fiber sensing.
  • To compare the performance of RZ-coded pulses against single-pulse BOTDA.

Main Methods:

  • Utilized differential pulse-width pair Brillouin optical time-domain analysis (DPP-BOTDA).
  • Employed coded optical probe pulses in RZ and NRZ formats.
  • Experimentally tested 512 bit RZ-coded pulse pairs (60/55 ns) over a 50 km large effective area fiber.

Main Results:

  • The RZ format maintained the Brillouin spectral shape.
  • RZ-coded pulses enhanced the sensing range and signal-to-noise ratio compared to single-pulse BOTDA.
  • Achieved a spatial resolution of approximately 0.5 m and a strain resolution of 12 microepsilon (0.7 MHz BFS).

Conclusions:

  • Coded optical probe pulses in RZ format significantly improve DPP-BOTDA performance for long-range sensing.
  • The RZ format offers superior signal-to-noise ratio and maintains spectral integrity.
  • High spatial and strain resolutions are achievable over extended fiber lengths using this method.