Single-shot BOTDA based on an optical chirp chain probe wave for distributed ultrafast measurement

Dengwang Zhou, Yongkang Dong, Benzhang Wang, Chao Pang, Dexin Ba, Hongying Zhang, Zhiwei Lu, Hui Li, Xiaoyi Bao

Research output: Contribution to journalArticlepeer-review

199 Scopus citations

Abstract

Brillouin optical time-domain analysis (BOTDA) requires frequency mapping of the Brillouin spectrum to obtain environmental information (e.g., temperature or strain) over the length of the sensing fiber, with the finite frequency-sweeping time-limiting applications to only static or slowly varying strain or temperature environments. To solve this problem, we propose the use of an optical chirp chain probe wave to remove the requirement of frequency sweeping for the Brillouin spectrum, which enables distributed ultrafast strain measurement with a single pump pulse. The optical chirp chain is generated using a frequency-agile technique via a fast-frequency-changing microwave, which covers a larger frequency range around the Stokes frequency relative to the pump wave, so that a distributed Brillouin gain spectrum along the fiber is realized. Dynamic strain measurements for periodic mechanical vibration, mechanical shock, and a switch event are demonstrated at sampling rates of 25 kHz, 2.5 MHz and 6.25 MHz, respectively. To the best of our knowledge, this is the first demonstration of distributed Brillouin strain sensing with a wide-dynamic range at a sampling rate of up to the MHz level.

Original languageEnglish
Article number32
JournalLight: Science and Applications
Volume7
Issue number1
DOIs
StatePublished - 1 Dec 2018
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2018 The Author(s).

Funding

This work was supported by the National Key Scientific Instrument and Equipment Development Project of China (2017YFF0108700) and National Natural Science Foundation of China (61575052). We like to express our gratitude to P.B. Xu and T.F. jiang for their suggestion in the primary experiment and P.L. Tong and L.W. Sheng for their contribution to the diagrams for the experimental setup.

FundersFunder number
National Natural Science Foundation of China61575052
National Key Scientific Instrument and Equipment Development Projects of China2017YFF0108700

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