50 km-Range Brillouin Optical Correlation Domain Analysis With First-Order Backward Distributed Raman Amplification

Title
50 km-Range Brillouin Optical Correlation Domain Analysis With First-Order Backward Distributed Raman Amplification
Authors
이상배이관일류국빈김규태송광용
Issue Date
2020-09
Publisher
Journal of lightwave technology : a joint IEEE/OSA publication
Citation
VOL 38, NO 18-5204
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.
URI
http://pubs.kist.re.kr/handle/201004/71980
ISSN
0733-8724
Appears in Collections:
KIST Publication > Article
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