Time-dependent variation of fiber Bragg grating reflectivity in PMMA-based polymer optical fibers

D. Saez-Rodriguez, Kristian Nielsen, Ole Bang, D. J. Webb

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

In this Letter, we investigate the effects of viscoelasticity on both the strength and resonance wavelength of two fiber Bragg gratings (FBGs) inscribed in microstructured polymer optical fiber (mPOF) made of undoped PMMA. Both FBGs were inscribed under a strain of 1% in order to increase the material photosensitivity. After the inscription, the strain was released, and the FBGs spectra were monitored. We initially observed a decrease of the reflection down to zero after which it began to increase. After that, strain tests were carried out to confirm the results, and finally the gratings were monitored for a further 120 days, with a stable reflection response being observed beyond 50 days. (C) 2015 Optical Society of America
Original languageEnglish
JournalOptics Letters
Volume40
Issue number7
Pages (from-to)1476-1479
ISSN0146-9592
DOIs
Publication statusPublished - 2015

Keywords

  • OPTICS
  • STRAIN SENSORS
  • PHOTOSENSITIVITY
  • FABRICATION
  • MECHANISM

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