Investigations on birefringence effects in polymer optical fiber Bragg gratings

X. Hu, D. Sáez Rodríguez, O. Bang, D.J. Webb, C. Caucheteur

Research output: Chapter in Book/Report/Conference proceedingConference publication


Step-index polymer optical fiber Bragg gratings (POFBGs) and microstructured polymer optical fiber Bragg gratings (mPOFBGs) present several attractive features, especially for sensing purposes. In comparison to FBGs written in silica fibers, they are more sensitive to temperature and pressure because of the larger thermo-optic coefficient and smaller Young's modulus of polymer materials. (M)POFBGs are most often photowritten in poly(methylmethacrylate) (PMMA) materials using a continuous-wave 325 nm HeCd laser. For the first time to the best of our knowledge, we study photoinduced birefringence effects in (m)POFBGs. To achieve this, highly reflective gratings were inscribed with the phase mask technique. They were then monitored in transmission with polarized light. For this, (m)POF sections a few cm in length containing the gratings were glued to angled silica fibers. Polarization dependent loss (PDL) and differential group delay (DGD) were computed from the Jones matrix eigenanalysis using an optical vector analyser. Maximum values exceeding several dB and a few picoseconds were obtained for the PDL and DGD, respectively. The response to lateral force was finally investigated. As it induces birefringence in addition to the photo-induced one, an increase of the PDL and DGD values were noticed. © 2014 Copyright SPIE.

Original languageEnglish
Title of host publicationMicro-structured and specialty optical fibres III
EditorsKyriacos Kalli, Alexis Mendez
Place of PublicationBellingham, WA (US)
Number of pages6
ISBN (Print)978-1-62841076-1
Publication statusPublished - 2014
EventMicro-structured and specialty optical fibres III - Brussels, Belgium
Duration: 14 Apr 201415 Apr 2014

Publication series

NameSPIE proceedings
ISSN (Print)0277-786X


ConferenceMicro-structured and specialty optical fibres III

Bibliographical note

Hu, X.; Sáez Rodríguez, David; Bang, O.; Webb, D. J.; Caucheteur, C., "Investigations on birefringence effects in polymer optical fiber Bragg gratings",
Micro-structured and specialty optical fibres III, eds. Kyriacos Kalli; Alexis Mendez, 91280Q, 2014.
Copyright 2014 Society of Photo-Optical Instrumentation Engineers. 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 modification of the content of the paper are prohibited.


  • birefringence
  • Bragg grating
  • polymer optical fiber
  • sensor
  • transverse force

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