Ryu, Gukbeen Kim, Gyu-Tae Song, Kwang Yong Lee, Sang Bae Lee, Kwanil 2024-01-19T16:33:26Z 2024-01-19T16:33:26Z 2021-09-02 2020-09-15 0733-8724 https://pubs.kist.re.kr/handle/201004/118119 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 52.1km sensing fiber with 7cm spatial resolution, where the number of resolving points of measurement is more than 744 000. English IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC STRAIN-MEASUREMENT SCATTERING PROPOSAL 50 km-Range Brillouin Optical Correlation Domain Analysis With First-Order Backward Distributed Raman Amplification Article 10.1109/JLT.2020.3001585 1 JOURNAL OF LIGHTWAVE TECHNOLOGY, v.38, no.18, pp.5199 - 5204 JOURNAL OF LIGHTWAVE TECHNOLOGY 38 18 5199 5204 scie scopus 000594781400035 2-s2.0-85090936875 Engineering, Electrical & Electronic Optics Telecommunications Engineering Optics Telecommunications Article STRAIN-MEASUREMENT SCATTERING PROPOSAL Scattering Stimulated emission Probes Optical fiber sensors Frequency modulation Optical fiber amplifiers Optical fiber sensor Raman scattering Stimulated brillouin scattering time domain analysis