Interrogation of fibre Bragg grating sensors using an arrayed waveguide grating

D.C.C. Norman, David J. Webb, R.D. Pechstedt

Research output: Contribution to journalArticlepeer-review


We experimentally investigate the use of an arrayed waveguide grating (AWG) to interrogate fibre Bragg grating (FBG) sensors. A broadband light source is used to illuminate the FBG sensors. Reflected spectral information is directed to the AWG containing integral photodetectors providing 40 electrical outputs. Three methods are described to interrogate FBG sensors. The first technique makes use of the wavelength-dependent transmission profile of an AWG channel passband, giving a usable range of 500 με and a dynamic strain resolution of 96 nε Hz-1/2 at 13 Hz. The second approach utilizes wide gratings larger than the channel spacing of the AWG; by monitoring the intensity present in several neighbouring AWG channels an improved range of 1890 με was achieved. The third method improves the dynamic range by utilizing a heterodyne approach based on interferometric wavelength shift detection, providing an improved dynamic strain resolution of 17 nε Hz -1/2 at 30 Hz. © 2005 IOP Publishing Ltd.

Original languageEnglish
Pages (from-to)691-698
Number of pages8
JournalMeasurement Science and Technology
Issue number3
Publication statusPublished - 31 Jan 2005

Bibliographical note

© 2005 IOP Publishing Ltd.


  • arrayed waveguide grating
  • fibre Bragg grating sensors
  • integral photodetectors
  • 40 electrical outputs


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