Influence of stimulated Brillouin scattering on positioning accuracy of long-range dual Mach-Zehnder interferometric vibration sensors

Xiangge He, Shangran Xie, Shan Cao, Fei Liu, Xiaoping Zheng, Min Zhang*, Han Yan, Guocai Chen

*Corresponding author for this work

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Abstract

The properties of noise induced by stimulated Brillouin scattering (SBS) in long-range interferometers and their influences on the positioning accuracy of dual Mach-Zehnder interferometric (DMZI) vibration sensing systems are studied. The SBS noise is found to be white and incoherent between the two arms of the interferometer in a 1-MHz bandwidth range. Experiments on 25-km long fibers show that the root mean square error (RMSE) of the positioning accuracy is consistent with the additive noise model for the time delay estimation theory. A low-pass filter can be properly designed to suppress the SBS noise and further achieve a maximum RMSE reduction of 6.7 dB.

Original languageEnglish
Article number116111
JournalOptical Engineering
Volume55
Issue number11
DOIs
Publication statusPublished - 1 Nov 2016
Externally publishedYes

Keywords

  • distributed fiber vibration sensing
  • dual Mach-Zehnder interferometer
  • stimulated Brillouin scattering
  • time delay estimation

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He, X., Xie, S., Cao, S., Liu, F., Zheng, X., Zhang, M., Yan, H., & Chen, G. (2016). Influence of stimulated Brillouin scattering on positioning accuracy of long-range dual Mach-Zehnder interferometric vibration sensors. Optical Engineering, 55(11), Article 116111. https://doi.org/10.1117/1.OE.55.11.116111