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Temperature-induced reversible changes in the spectral characteristics of fiber Bragg gratings
1Laboratoire de Physique des Lasers, Atomes et Molécules, Unité Mixte de Recherche, 8523 Centre d'Etude et de Recherche sur les Lasers et Applications, Université de Lille I-Unité de Formation et de Recherche de Physique, 59655 Villeneuve d'Ascq, France.
Abstract:
It is reported that reversible changes in the reflectivity of Bragg gratings can be induced by a change in the temperature of the grating (77 K < T < K). The changes have proved to be greater in highly doped Ge fibers than in standard fibers, whereas they could hardly be detected in hydrogenated fibers. The sign of the change for type I gratings was opposite that for type IIA gratings. The changes are likely due to a temperature-induced increase (or a decrease) in the amplitude of the refractive-index modulation. Possible mechanisms for these changes in modulation are discussed. Interestingly for the purpose of correcting data of isothermal accelerated aging experiments, a numerical relation that accounts for the temperature-induced changes in type I grating reflectivity is given.
