LPG inscription in mPOF for optical sensing

Rui Min, Carlos Marques, Ole Bang, Beatriz Ortega

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We demonstrate a long period grating (LPG) inscription in microstructured polymer optical fibers (mPOFs) using a single 248 nm UV laser pulse of 15 ns duration for every inscription point using a point by point technique with total length of 25 mm. The fabrication time indicates shortening for a single coupling point (15 ns against 42 s reported in literature). A grating with 20 dB transmission dip has been fabrication by using two UV pulses for each coupling point. The device has been fabricated in mPOF with a core that has been doped with benzyl dimethyl ketal (BDK) for photosensitivity increase. The strain and temperature responses of the fabricated gratings under different conditions have been characterized in order to assess the viability for sensing applications. Better performance was achieved with suitable post annealing process of the gratings.

Original languageEnglish
Title of host publicationMicro-Structured and Specialty Optical Fibres V
Number of pages7
PublisherSPIE - International Society for Optical Engineering
Publication date2018
Article number1068108
ISBN (Electronic)9781510618886
Publication statusPublished - 2018
EventSPIE Photonics Europe 2018 - Palais de la Musique et des Congrès, Strasbourg, France
Duration: 22 Apr 201826 Apr 2018


ConferenceSPIE Photonics Europe 2018
LocationPalais de la Musique et des Congrès
SeriesS P I E - International Society for Optical Engineering. Proceedings


  • Fiber Bragg gratings
  • Optical sensing
  • Polymer optical fibers


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