Gamma-radiation enhancement of sensing properties of FBGs in a few-mode polymer CYTOP fiber

Ivan Chapalo, Karima Chah, Andrei Goussarov, Andreas Ioannou, Andreas Pospori, Ying-Gang Nan, Kyriacos Kalli, Patrice Mégret

    Research outputpeer-review


    We investigate the effect of γ-radiation on temperature (T) and relative humidity (RH) sensitivities of polymer perfluorinated fiber Bragg gratings (FBGs). To this aim, different γ-radiation doses (80, 120, 160, and 520 kGy) were applied to a set of FBGs. We show that irradiated FBGs demonstrate an RH sensitivity rise with the received dose: from 13.3 pm/%RH for a pristine FBG up to 56.8 pm/%RH for a 520-kGy dose at 30℃. In contrast, T sensitivity decreases with radiation dose with a subsequent change of sign from positive to negative. Therefore, by experimental interpolation, T sensitivity can be eliminated at around a 160-kGy dose. This opens the possibility of designing an RH sensor with enhanced sensitivity, which at the same time is insensitive to T.

    Original languageEnglish
    Pages (from-to)1248–1251
    Number of pages4
    JournalOptics letters
    Issue number5
    StatePublished - 1 Mar 2023

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics

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