Single-measurement digital optical frequency comb based phase-detection Brillouin optical time domain analyzer

Single-measurement digital optical frequency comb based phase-detection Brillouin optical time domain analyzer

A single-measurement sweep-free distributed Brillouin optical time domain analyzer (BOTDA) sensor based on phase detection is proposed and experimentally demonstrated employing digital optical frequency comb (DOFC) probe signal. Brillouin Phase Spectrum (BPS) of DOFC probe induced by Brillouin inter...

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Veröffentlicht in:Optics express 2017-04, Vol.25 (8), p.9213-9224
Hauptverfasser: Jin, Chao, Wang, Liang, Chen, Yuli, Guo, Nan, Chung, Wenghong, Au, Hoyin, Li, Zhaohui, Tam, Hwa-Yaw, Lu, Chao
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container_end_page 9224
container_issue 8
container_start_page 9213
container_title Optics express
container_volume 25
creator Jin, Chao
Wang, Liang
Chen, Yuli
Guo, Nan
Chung, Wenghong
Au, Hoyin
Li, Zhaohui
Tam, Hwa-Yaw
Lu, Chao
description A single-measurement sweep-free distributed Brillouin optical time domain analyzer (BOTDA) sensor based on phase detection is proposed and experimentally demonstrated employing digital optical frequency comb (DOFC) probe signal. Brillouin Phase Spectrum (BPS) of DOFC probe induced by Brillouin interaction is measured using coherent detection in a single acquisition, without any frequency scanning and data averaging. Single-measurement BOTDA sensor based on BPS in 10km long fiber is demonstrated with a response time of 100 μs, which is limited only by the fiber length. The spatial resolution is 51.2m, determined by the duration of DOFC. And the Brillouin frequency shift (BFS) uncertainty is estimated to be~1.5 MHz at the end of fiber under test (FUT). Benefiting from the fast response time, dynamic measurement up to 1 kHz vibration frequency has been demonstrated.
doi_str_mv 10.1364/OE.25.009213
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title Single-measurement digital optical frequency comb based phase-detection Brillouin optical time domain analyzer
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