Strain characteristics of CO2-laser-carved long period fiber gratings

Yi Ping Wang, Wei Jin, D. N. Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

18 Citations (Scopus)


Unique strain characteristics of long period fiber gratings (LPFG) fabricated by a focused CO2laser beam carving periodic grooves on the fiber are investigated for the first time to our knowledge. Resonant wavelength, transmission attenuation, and polarization dependent loss (PDL) of the CO2-laser-carved LPFG are found to depend strongly on the tensile strain applied, and their strain sensitivities are dependent on the depth of grooves and/or the initial refractive index modulation. The average strain sensitivity of resonant wavelength for LPFG is increased by 229 times and is up to -102.89 nm/mε by means of carving periodic grooves on the fiber. When a stretching force is applied to the LPFG, the resonant wavelength can "blue" shift by -11.84 nm, the absolute value of peak transmission attenuation and the maximum PDL can be increased by 25.913 and 26.535 dB, respectively. The CO2-laser-carved LPFG combines the features of the three types of LPFGs reported previously, i.e, the CO2-laser-induced LPFGs without physical deformation, the corrugated LPFGs fabricated by hydrofluoric acid etching, and the microbend-induced LPFGs. The mechanisms of refractive index modulation in the CO2-laser-carved LPFGs under tensile strain are rather complicated and may be regarded as a combination of the stress-relaxation-, the groove-, the strain-, and the microbend-induced refractive index perturbations.
Original languageEnglish
Pages (from-to)101-108
Number of pages8
JournalIEEE Journal of Quantum Electronics
Issue number2
Publication statusPublished - 1 Feb 2007


  • CO laser 2
  • Long period fiber grating
  • Microbends
  • Optical fiber device
  • Optical fiber sensor
  • Periodic grooves
  • Polarization dependent loss
  • Strain characteristic

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)


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