We report continuous measurements of the transmission spectrum of a fiber loop mirror interferometer composed of a Panda-type polarization-maintaining (PM) optical fiber during the diffusion of dihydrogen (H) gas into the fiber. Birefringence variation is measured through the wavelength shift of the interferometer spectrum when the PM fiber is inserted into a gas chamber with H concentration from 1.5 to 3.5 vol.% at 75 bar and 70°C. The measurements correlated with simulation results of H diffusion into the fiber lead to a birefringence variation of -4.25 × 10 per mol m of H concentration in the fiber, with a birefringence variation as low as -9.9×10 induced by 0.031 μmol m of H dissolved in the single-mode silica fiber (for 1.5 vol.%). These results highlight a modification of the strain distribution in the PM fiber, induced by H diffusion, leading to a variation of the birefringence that could deteriorate the performances of fiber devices or improve H gas sensors.
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