Investigation of Brillouin scattering in high Germa-nia-doped few-mode fiber for bend-resistant sensing
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Guangdong University of Technology

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Guangdong Introducing Innovative and Entrepreneurial Teams of “The Pearl River Talent Recruitment Program” (No. 2019ZT08X340), National Natural Science Foundation of China (No. 62475052 and No. 62005051)

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    Abstract:

    The stimulated Brillouin scattering of heavy Germania-doped few-mode fiber (HG-FMF) up to 98 mol% and its de-pendence on temperature, strain, and bending are studied in this paper, respectively. Two widely located individual Bril-louin gain spectra (BGS), whose central peaks are 8.151 and 8.862 GHz, are found in HG-FMF, respectively. These two BGSs are generated by the interaction between the fundamental and higher-order acoustic wave modes, which match well with the numerical simulation. The heavy Germania-doping induced a large refractive index difference between the core and cladding that strongly confined the optical field in the fiber core and modified its Brillouin parameter. This fact also leads to the bending resistance of HG-FMF, in the bending radii from 0.3 to 2 cm, in contrast to traditional few-mode fi-bers, and suppressed the temperature and strain sensitivity of the two BGSs to 213, 342 kHz/℃ and 20.5, 21.4 kHz/μ?, respectively. These advances of HG-FMF could be potentially used for bending-resistant distributed multi-parameter sensing.

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History
  • Received:February 18,2025
  • Revised:March 28,2025
  • Adopted:April 08,2025
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