Abstract
We demonstrate the enlargement of sensing range of Brillouin optical correlation domain analysis (BOCDA) system by introducing the first-order distributed Raman amplification. The time-domain data processing is adopted for the BOCDA system utilizing a gated Brillouin pump, and the Raman amplification is applied to compensate for the depletion of Brillouin pump induced by Rayleigh scattering and Brillouin interaction. The Raman pump is injected in the opposite direction to the propagation of Brillouin pump, where the pumping scheme is optimized by simulations. A differential measurement scheme is additionally introduced for improving spatial resolution and dynamic range. In experiments, we measure the strain distribution along a 52.1 km sensing fiber with 7 cm spatial resolution, where the number of resolving points of measurement is more than 744 000.
Original language | English |
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Article number | 9115227 |
Pages (from-to) | 5199-5204 |
Number of pages | 6 |
Journal | Journal of Lightwave Technology |
Volume | 38 |
Issue number | 18 |
DOIs | |
Publication status | Published - 2020 Sept 15 |
Bibliographical note
Funding Information:Manuscript received March 16, 2020; revised May 19, 2020; accepted June 7, 2020. Date of publication June 11, 2020; date of current version September 15, 2020. This work was supported in part by the Institute of Information & communications Technology Planning & Evaluation (IITP) grant funded by the Korea government (MSIT) (no. 2019-0-00720, Development of high-sensitivity gravimeter using quantum sensor technology) and by the R&D Program (2E30120) funded by the Korea Institute of Science and Technology (KIST). (Corresponding Author: Kwanil Lee.) Gukbeen Ryu is with the School of Electrical Engineering, Korea University, Seoul 02841, South Korea and also with Nanophotonics Research Center, Korea Institute of Science and Technology, Seoul 02792, South Korea (e-mail: [email protected]).
Publisher Copyright:
© 1983-2012 IEEE.
Keywords
- Optical fiber sensor
- Raman scattering
- Stimulated brillouin scattering
- time domain analysis
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics