Humidity insensitive TOPAS polymer fiber Bragg grating sensor

Wu Yuan, Lutful Khan, David J. Webb, Kyriacos Kalli, Henrik K. Rasmussen, Alessio Stefani, Ole Bang

Research output: Contribution to journalArticlepeer-review


We report the first experimental demonstration of a humidity insensitive polymer optical fiber Bragg grating (FBG), as well as the first FBG recorded in a TOPAS polymer optical fiber in the important low loss 850nm spectral region. For the demonstration we have fabricated FBGs with resonance wavelength around 850 nm and 1550 nm in single-mode microstructured polymer optical fibers made of TOPAS and the conventional poly (methyl methacrylate) (PMMA). Characterization of the FBGs shows that the TOPAS FBG is more than 50 times less sensitive to humidity than the conventional PMMA FBG in both wavelength regimes. This makes the TOPAS FBG very appealing for sensing applications as it appears to solve the humidity sensitivity problem suffered by the PMMA FBG.
Original languageEnglish
Pages (from-to)19731-19739
Number of pages9
JournalOptics Express
Issue number20
Publication statusPublished - 26 Sept 2011

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