Investigations on birefringence effects in polymer optical fiber Bragg gratings

Xiaolian Hu, D. Saez-Rodriguez, Ole Bang, D. J. Webb, C. Caucheteur

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


    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.
    Original languageEnglish
    Title of host publicationProceedings of the SPIE
    Publication date2014
    Publication statusPublished - 2014
    EventMicro-structured and Specialty Optical Fibres III - Clarion Congress Hotel, Brussels, Belgium
    Duration: 15 Apr 201418 Apr 2014


    ConferenceMicro-structured and Specialty Optical Fibres III
    LocationClarion Congress Hotel
    SeriesProgress in Biomedical Optics and Imaging - Proceedings of SPIE


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