Razafimahatratra D, Niay P, Douay M, Poumellec B, Riant I
Laboratoire de Physique des Lasers, Atomes et Molécules, Unité Mixte de Recherche, Centre National de la Recherche Scientifique 8523, Université des Sciences et Technologies de Lille, Bâtiment P5, 59655 Villeneuve d'Ascq Cedex, France.
Appl Opt. 2000 Apr 20;39(12):1924-33. doi: 10.1364/ao.39.001924.
We compare the results of thermally induced isochronal and isothermal decays of fiber Bragg gratings written through cw exposure of an unloaded germanosilicate fiber. We show that isochronal step decays can be used to predict isothermal decays, provided that some corrections are carried out to take into account a reversible change in grating reflectivity induced by the increase of the fiber temperature. The isochronal accelerated-aging method enables one to sample most of the initial distribution of trapped site energies in a fairly short time. Taking advantage of this property of the method, we show that the initial distribution for a weak grating is similar to those for stronger gratings. The consequences of this observation are discussed within the framework of the various reaction pathway model.
我们比较了通过连续波曝光未加载的锗酸盐光纤写入的光纤布拉格光栅的热致等时和等温衰减结果。我们表明，只要进行一些校正以考虑光纤温度升高引起的光栅反射率的可逆变化，等时阶跃衰减就可用于预测等温衰减。等时加速老化方法能够在相当短的时间内对捕获位点能量的大部分初始分布进行采样。利用该方法的这一特性，我们表明弱光栅的初始分布与较强光栅的初始分布相似。在各种反应途径模型的框架内讨论了这一观察结果的后果。
