An OTDR and gratings assisted multifunctional fiber sensing system

Xiangchuan Wang, Zhijun Yan, Feng Wang, Ji Hua, Chengbo Mou, Zhongyuan Sun, Xuping Zhang, Lin Zhang

Research output: Contribution to journalArticlepeer-review


We report a distributed multifunctional fiber sensing network based on weak-fiber Bragg gratings (WFBGs) and long period fiber grating (LPG) assisted OTDR system. The WFBGs are applied for temperature, strain, and vibration monitoring at key position, and the LPG is used as a linear filter in the system to convert the wavelength shift of WFBGs caused by environmental change into the power change. The simulation results show that it is possible to integrate more than 4472 WFBGs in the system when the reflectivity of WFBGs is less than {10}^{-5}. Besides, the back-Rayleigh scattering along the whole fiber can also be detected which makes distributed bend sensing possible. As an experimental demonstration, we have used three WFBGs UV-inscribed with 50-m interval at the end of a 2.6-km long fiber, which part was subjected for temperature, strain, and vibration sensing, respectively. The ratio of the intensity of output and input light is used for temperature and strain sensing, and the results show strain and temperature sensitivities are 4.2 \times {10}^{-4}{/\mu \varepsilon } and 5.9 \times {10}^{-3}{{/ {^{\circ }}\textrm {C}}} , respectively. Detection of multiple vibrations and single vibration with the broad frequency band up to 500 Hz are also achieved. In addition, distributed bend sensing which could be simultaneously realized in this system has been proposed.

Original languageEnglish
Pages (from-to)4660-4666
Number of pages7
JournalIEEE Sensors Journal
Issue number8
Early online date28 Apr 2015
Publication statusPublished - Aug 2015

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  • optical fiber gratings
  • optical fiber measurements
  • optical time domain reflectometry
  • vibration measurement


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