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

Kyriacos Kalli*, A. George Simpson, Kaimin Zhou, Lin Zhang, David Birkin, Tim Ellingham, Ian Bennion

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-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 1400nm 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 stabilised gratings can be spectrally tailored, for tuning fibre lasers or edge filter modification in sensing applications, by purely optical means.

Original languageEnglish
Article number61930Y
JournalProceedings of SPIE - International Society for Optical Engineering
Publication statusPublished - 9 Aug 2006
EventReliability of Optical Fiber Components, Devices, Systems, and Networks III - Strasbourg, United Kingdom
Duration: 3 Apr 20064 Apr 2006

Bibliographical note

Copyright 2006 SPIE. One print or electronic copy may be made for personal use only. Systematic reproduction, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.


  • Fibre Bragg gratings
  • Optical fibre sensors
  • Photosensitivity
  • Type IA grating
  • Wavelength tuning


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