Distributed temperature measurement using a Fabry-Perot effect based chirped fiber Bragg grating

P. C. Won*, Y. Lai, W. Zhang, J. S. Leng, J. A R Williams

*Corresponding author for this work

Research output: Contribution to journalArticle


A temperature distribution sensing system based on the reflection spectrum of a 70 mm apodized chirped fiber Bragg grating has been demonstrated. Reflection variations created by the Fabry-Perot effect due to the intra-grating wavelength shift are presented. By fitting a parametric transfer matrix model of the grating response to measured spectra, the temperature change, position and width of a localized temperature change are obtained. This system is particularly attractive of its simplicity, high spatial resolution and ability in measuring a non-monotonic distribution. Experiments to measure two localized heating regions along the grating indicate that the technique is promising for measuring more complex temperature profiles.

Original languageEnglish
Pages (from-to)494-499
Number of pages6
JournalOptics Communications
Issue number2
Publication statusPublished - 15 Sep 2006



  • Bragg grating
  • Fiber-optic sensors
  • Temperature measurement

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