Spectral modification of type IA fibre Bragg gratings by high-power near-infrared lasers

K. Kalli*, A.G. Simpson, K. Zhou, L. Zhang, D. Birkin, T. Ellingham, I. Bennion

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We report the first experimental measurements on the spectral modification of type IA fibre Bragg gratings, incorporated in an optical network, which result from the use of high-power, near-infrared lasers. The fibre grating properties are modified in a controlled manner by exploiting the characteristics of the inherent 1400 nm absorption band of the optical fibre, which grows in strength during the type IA grating inscription. If the fibre network is illuminated with a high-power laser, having an emission wavelength coincident with the absorption band, the type IA centre wavelength and chirp can be modified. Furthermore, partial grating erasure is demonstrated. This has serious implications when using type IA gratings in an optical network, as their spectrum can be modified using purely optical methods (no external heating source acts on the fibre), and to their long-term stability as the grating is shown to decay. Conversely, suitably stabilized gratings can be spectrally tailored, for tuning fibre lasers or edge filter modification in sensing applications, by purely optical means. © 2006 IOP Publishing Ltd.

Original languageEnglish
Pages (from-to)968-974
Number of pages7
JournalMeasurement Science and Technology
Issue number5
Early online date6 Apr 2006
Publication statusPublished - May 2006


  • fibre Bragg gratings
  • optical fibre sensors
  • photosensitivity
  • type IA grating
  • wavelength tuning


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