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Bandwidth-division in digitally enhanced optical frequency domain reflectometry.

Nicolas Riesen1, Timothy T-Y Lam, Jong H Chow

  • 1Department of Quantum Science, Research School of Physics and Engineering, The Australian National University, Canberra, ACT 0200, Australia. nicolas.riesen@anu.edu.au

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Summary

Digital range-gating in optical frequency domain reflectometry (OFDR) significantly reduces sampling rates, enabling long-fiber sensing with fast frequency sweeps. This breakthrough avoids impractical sampling requirements through digitally enhanced interferometry.

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Area of Science:

  • Optics
  • Fiber Optics
  • Signal Processing

Background:

  • Optical Frequency Domain Reflectometry (OFDR) is a powerful technique for high-resolution measurements in optical fibers.
  • Traditional OFDR requires high sampling rates, limiting sensing distance and sweep speed.
  • Impractical sampling rates pose a significant challenge for advanced OFDR applications.

Purpose of the Study:

  • To introduce and demonstrate digital range-gating as a novel method in OFDR.
  • To significantly reduce the required sampling rates for OFDR systems.
  • To enable long-length fiber sensing with fast optical source frequency sweeps.

Main Methods:

  • Implementation of digital range-gating within the OFDR framework.
  • Utilizing digitally enhanced interferometry (DI) to isolate specific OFDR signal bandwidth sections.
  • Numerical simulations and experimental validation to confirm rate reductions.

Main Results:

  • Achieved orders of magnitude reduction in required sampling rates for OFDR.
  • Demonstrated the feasibility of long-fiber sensing with fast frequency sweeps.
  • Validated the effectiveness of bandwidth-division through digital range-gating numerically and experimentally.

Conclusions:

  • Digital range-gating is a transformative technique for OFDR.
  • This method overcomes the limitations of high sampling rates in conventional OFDR.
  • Enables more practical and efficient long-distance fiber optic sensing.