Comparative study on reduced impacts of Brillouin pump depletion and nonlinear amplification in coded DBA-BOTDA

Kai Lin; Xinhong Jia; Huiliang Ma; Cong Xu; Xuan Zhang; Lei Ao

doi:10.3788/COL201816.090604

Journals >Chinese Optics Letters >Volume 16 >Issue 9 >Page 090604 > Article

Chinese Optics Letters
Vol. 16, Issue 9, 090604 (2018)

Comparative study on reduced impacts of Brillouin pump depletion and nonlinear amplification in coded DBA-BOTDA

Kai Lin, Xinhong Jia^*, Huiliang Ma, Cong Xu, Xuan Zhang, and Lei Ao

Author Affiliations

College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu 610101, China

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DOI: 10.3788/COL201816.090604 Cite this Article Set citation alerts

Kai Lin, Xinhong Jia, Huiliang Ma, Cong Xu, Xuan Zhang, Lei Ao. Comparative study on reduced impacts of Brillouin pump depletion and nonlinear amplification in coded DBA-BOTDA[J]. Chinese Optics Letters, 2018, 16(9): 090604 Copy Citation Text

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Abstract

The impacts of Brillouin pump depletion and nonlinear amplification in coded long-range Brillouin optical time-domain analysis (BOTDA) based on distributed Brillouin amplification (DBA) were studied. The error of Brillouin frequency shift (BFS) due to Brillouin pump depletion was compared for DBA-BOTDA using non-cyclic and cyclic coding. For non-cyclic coding, significant over- and under-shoots of BFS were found in the range with larger BFS variation, such as hot spot. The impact of Brillouin pump depletion can be reduced considerably by cyclic coding. Furthermore, to compensate the BFS error due to nonlinear amplification, a simple and effective log linearization was proposed and demonstrated.