A novel fiber strain sensor based on laser's transient regime

Shao Jun Luo, Wen Gang Guo, Xiu Feng Yang, Fu Yun Lu, Chao Lu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)


A novel fiber strain sensor based on the fiber laser's transient regime is reported. A Sagnac fiber loop and a fiber Bragg grating(FBG) that also acts as the sensing element form the linear Fabry-Perot cavity, in which a long-period grating(LPG) is inserted. The original peak wavelength of the FBG, whose bandwidth is 0.23 nm, is 1557.98 nm and located on the left side of the LPG dip (1557.4 nm). The light reflected from the Sagnac loop and the FBG is transmitted through the LPG twice in each round trip, and the transmission loss increases with the strain-induced wavelength shift of the FBG, which in turn modifies the laser build-up time. The strain value can be obtained by measuring the build-up time of the laser. In the present experiment, the sensor's sensitivity and resolution can be adjusted by simply controlling the pumping level. When the pump pulse' high level and low level are 32 mWand 6 mW, respectively, a sensitivity of 7 × 10-6ε/μs and resolution of 7 × 10-7ε are achieved.
Original languageEnglish
Pages (from-to)1889-1893
Number of pages5
JournalWuli Xuebao/Acta Physica Sinica
Issue number4
Publication statusPublished - 1 Apr 2006
Externally publishedYes


  • Fiber Bragg grating
  • Fiber laser
  • Strain sensor
  • Time domain

ASJC Scopus subject areas

  • General Physics and Astronomy


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