Novel thermal annealing methodology for permanent tuning polymer optical fiber Bragg gratings to longer wavelengths

A. Pospori*, C. A.F. Marques, G. Sagias, H. Lamela-Rivera, D. J. Webb

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The Bragg wavelength of a polymer optical fiber Bragg grating can be permanently shifted by utilizing the thermal annealing method. In all the reported fiber annealing cases, the authors were able to tune the Bragg wavelength only to shorter wavelengths, since the polymer fiber shrinks in length during the annealing process. This article demonstrates a novel thermal annealing methodology for permanently tuning polymer optical fiber Bragg gratings to any desirable spectral position, including longer wavelengths. Stretching the polymer optical fiber during the annealing process, the period of Bragg grating, which is directly related with the Bragg wavelength, can become permanently longer. The methodology presented in this article can be used to multiplex polymer optical fiber Bragg gratings at any desirable spectral position utilizing only one phase-mask for their photo-inscription, reducing thus their fabrication cost in an industrial setting.

Original languageEnglish
Pages (from-to)1411-1421
Number of pages11
JournalOptics Express
Issue number2
Early online date12 Jan 2018
Publication statusPublished - 12 Jan 2018

Bibliographical note

© 2018 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.

Funding: People Programme (Marie Curie Actions) of the European Union’s Seventh Framework Programme FP7/2007-2013 (608382); National funding agencies FCT/MEC and FEDER-PT2020
(UID/EEA/50008/2013); National funding agency FCT (SFRH/BPD/109458/2015).


  • Fiber Bragg gratings
  • Fiber optics
  • Multiplexing
  • Polymer waveguides


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