Journal
OPTICS LETTERS
Volume 44, Issue 5, Pages 1245-1248Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.44.001245
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Funding
- Ministry of Science and Technology (MOST) [2016YFC0801202]
- National Natural Science Foundation of China (NSFC) [61405020, 61475029, 61635004, 61775023]
- National Science Fund for Distinguished Young Scholars [61825501]
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We propose a novel technique to enhance the dynamic range of a coherent slope-assisted Brillouin optical time domain analysis. A multi-tone probe and a reference wave are launched into the fiber under test (FUT); after interacting with the pump pulse, the Brillouin gain, as well as the Brillouin phase shift of each tone, can be demodulated simultaneously. In light of this, the strain information can be determined by the Brillouin phase-gain ratio of each tone. In the experiment, a three-tone probe with a 60 MHz interval is used; effective measurement frequency span larger than 180 MHz is verified in a similar to 2 km single-mode fiber with 2.5 m spatial resolution and 1.5 kHz sampling rate to strain. A vibration signal with 41 Hz frequency and 2546 mu e amplitude is successfully demodulated. (c) 2019 Optical Society of America
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