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Phase-noise-compensated optical frequency domain reflectometry with measurement range beyond laser coherence length

Xinyu Fan1, Yusuke Koshikiya, Fumihiko Ito

  • 1NTT Access Network Service Systems Laboratories, 1-7-1 Hanabatake, Tsukuba-city, Ibaraki 305-0805, Japan. fan@ansl.ntt.co.jp

Optics Letters
|November 21, 2007
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Summary

A new optical frequency domain reflectometry technique extends measurement range beyond laser coherence length. This method effectively compensates for laser phase noise using a novel auxiliary interferometer process.

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Area of Science:

  • Optics and Photonics
  • Optical Metrology
  • Interferometry

Background:

  • Optical Frequency Domain Reflectometry (OFDR) is limited by laser coherence length.
  • Laser phase noise significantly impacts OFDR measurement accuracy and range.
  • Extending the measurement range of OFDR is crucial for applications like long-haul fiber optic sensing.

Purpose of the Study:

  • To propose and experimentally demonstrate a novel OFDR technique.
  • To overcome the limitation of laser coherence length in OFDR measurements.
  • To effectively compensate for laser phase noise beyond the coherence length.

Main Methods:

  • A novel compensation process using a single auxiliary interferometer was developed.
  • Reference signals from the auxiliary interferometer were used to mitigate phase noise.
  • Numerical compensation was performed using a computer for each section of the delay fiber.
  • Data acquisition was performed only once for the compensation process.

Main Results:

  • The proposed OFDR technique demonstrated a measurement range significantly longer than the laser coherence length.
  • Experimental results confirmed effective compensation of laser phase noise.
  • The technique successfully operated beyond the coherence length limitation.

Conclusions:

  • The novel OFDR technique effectively extends measurement range by compensating for laser phase noise.
  • The auxiliary interferometer and numerical compensation process are key to overcoming coherence length limitations.
  • This advancement has significant implications for long-distance optical measurements and sensing.