Brillouin expanded time-domain analysis based on dual optical frequency combs

Jae Hyeong Youn; Kwang Yong Song; Sonia Martin-Lopez; Miguel Gonzalez-Herraez; María R. Fernández-Ruiz

doi:10.1038/s41377-024-01499-x

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Brillouin expanded time-domain analysis based on dual optical frequency combs

Original Articles

- Brillouin expanded time-domain analysis based on dual optical frequency combs
- Light: Science & Applications Vol. 13, Issue 8, Pages: 1534-1544(2024)
- Affiliations：
  
  1.Dept. of Physics, Chung-Ang University, Seoul, Korea
  2.Dept. of Electronics, Universidad de Alcalá, Madrid, Spain
- Author bio：
  
  Kwang Yong Song (songky@cau.ac.kr)
  Miguel Gonzalez-Herraez (miguel.gonzalezh@uah.es)
- Funds：
- DOI：10.1038/s41377-024-01499-x
  CLC：
- Published：31 August 2024，
  
  Published Online：02 July 2024，
  
  Received：26 January 2024，
  
  Revised：18 May 2024，
  
  Accepted：30 May 2024
- Accepted：
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Youn, J. H. et al. Brillouin expanded time-domain analysis based on dual optical frequency combs. Light: Science & Applications, 13, 1534-1544 (2024).
DOI：

Youn, J. H. et al. Brillouin expanded time-domain analysis based on dual optical frequency combs. Light: Science & Applications, 13, 1534-1544 (2024). DOI： 10.1038/s41377-024-01499-x.

摘要

Abstract

Brillouin Optical Time-Domain Analysis (BOTDA) is a widely-used distributed optical fiber sensing technology employing pulse-modulated pump waves for local information retrieval of the Brillouin gain or loss spectra. The spatial resolution of BOTDA systems is intrinsically linked to pulse duration

so high-resolution measurements demand high electronic bandwidths inversely proportional to the resolution. This paper introduces Brillouin Expanded Time-Domain Analysis (BETDA) as a modified BOTDA system

simultaneously achieving high spatial resolution and low detection bandwidth. Utilizing two optical frequency combs (OFCs) with different frequency intervals as pump and probe

local Brillouin gain spectra are recorded by their spectral beating traces in an expanded time domain. A 2-cm-long hotspot located in a 230 m single-mode fiber is successfully measured in the time domain with a detection bandwidth of less than 100 kHz using dual OFCs with tailored spectral phase

line spacing

and bandwidth.

关键词

Keywords

references

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