Solution-Mediated Annealing of Polymer Optical Fiber Bragg Gratings at Room Temperature

Andrea Fasano, Getinet Woyessa, Jakob Janting, Henrik K. Rasmussen, Ole Bang

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Abstract

In this letter, we investigate the response of poly(methylmethacrylate) (PMMA) microstructured polymer optical fiber Bragg gratings (POFBGs) after immersion inmethanol/water solutions at room temperature. As the glass transition temperature of solution-equilibrated PMMA differs from the one of solvent-free PMMA, different concentrations of methanol and water lead to various degrees of frozen-in stress relaxation in the fiber. After solvent evaporation, we observe a permanent blue-shift in the grating resonance wavelength. The main contribution in the resonance wavelength shift arises from a permanent change in the size of the fiber. The results are compared with conventional annealing. The proposed methodology is cost-effective as it does not require a climate chamber. Furthermore, it enables an easy-to-control tuning of the resonance wavelength of POFBGs.
Original languageEnglish
JournalI E E E Photonics Technology Letters
Volume29
Issue number8
Pages (from-to)687-690
ISSN1041-1135
DOIs
Publication statusPublished - 2017

Keywords

  • Annealing
  • Plastic optical fiber
  • Optical fiber sensors
  • Bragg gratings
  • Polymers
  • Absorption

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