Unique temperature sensing characteristics of CO2-laser-notched long-period fiber gratings

Yiping Wang, Wei Jin, D. N. Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

22 Citations (Scopus)


Long-period fiber gratings (LPFGs) are written by use of a focused CO2laser beam to notch periodically on the surface of optical fibers. Temperature characteristics of the CO2-laser-notched LPFG are investigated in detailed to develop its sensing applications. It is shown that, for such LPFG, temperature sensitivity of resonant wavelength can be increased by creating deeper notches. The coupling from the fundamental core mode to a cladding mode in the LPFG can be enhanced by increasing the ambient temperature. The polarization-dependent loss (PDL) of the LPFG depends strongly on the ambient temperature. Such unique temperature characteristics can be used to solve the cross-sensitivity problem between the temperature and the tensile strain. So, the LPFG is a promising temperature sensor based on the wavelength modulation, on the intensity modulation and/or on the PDL modulation.
Original languageEnglish
Pages (from-to)1044-1048
Number of pages5
JournalOptics and Lasers in Engineering
Issue number10
Publication statusPublished - 1 Oct 2009


  • Fiber Bragg gratings
  • Long-period fiber gratings
  • Optical fiber sensors
  • polarization-dependent loss
  • Temperature

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics
  • Mechanical Engineering


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