Fiber Bragg gratings in hydrogen-loaded photosensitive fiber with two regeneration regimes
Fiber Bragg gratings in hydrogen-loaded photosensitive fiber with two regeneration regimes
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DOI：
10.1016/j.optcom.2013.09.061
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发表时间：
2014-02-15
影响因子：
2.4
通讯作者：
Roths, Johannes
中科院分区：
文献类型：
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作者：
Polz, Leonhard;Quang Nguyen;Roths, Johannes
在一个高掺锗光敏光纤共掺杂磷和氟和掺杂的内包层，我们观察到，在退火实验期间，作为温度和时间的函数的FBG强度的异常变化。这种特性仅在纤维中充有氢时才出现。在从室温到1200摄氏度的温度逐步增加15分钟的停留时间，光栅显示，在初始热衰减后，在两个不同的温度范围内的反射率随时间的显着增加。反射率增加的一个范围是在850摄氏度到1000摄氏度之间。在此范围内的FBG的行为非常类似于已知的化学成分或再生光栅。另一个反射率增加的温度范围是在500摄氏度和700摄氏度之间，然后在750摄氏度和800摄氏度之间的温度下反射率强烈下降。这两种再生机制都可能与这种类型光纤的纤芯和掺杂内包层的变化有关。研究了不同温度下λ（B）和三角形n（AC）的漂移行为。在特定的温度区域，正的波长漂移结合三角形n（AC）的减少已被观察到。这与标准的热衰减模型相矛盾，并且似乎是再生光栅的特征。(c)2013爱思唯尔有限公司版权所有。
In a highly Ge-doped photosensitive fiber co-doped with phosphorus and fluorine and with a doped inner cladding, we observed, during annealing experiments, an anomalous variation of the FBG strength as a function of temperature and time. This characteristic only occurred when the fiber had been loaded with hydrogen. During a stepwise temperature increase from room temperature to 1200 degrees C with 15 min dwell times, the gratings showed, after an initial thermal decay, in two distinct temperature ranges a significant increase in reflectivity with time. One range with an increase in reflectivity was found between 850 degrees C and 1000 degrees C. The behavior of the FBGs in this range was very similar to that known from chemical composition or regenerated gratings. Another temperature range with increasing reflectivity was found between 500 degrees C and 700 degrees C, followed by a strong decrease in reflectivity at temperatures between 750 degrees C and 800 degrees C. Both regimes of regeneration might be associated with changes in the core and the doped inner cladding of this type of fiber. At different temperatures the drift behavior of lambda(B) and triangle n(AC) was investigated. In specific temperature regions a positive wavelength drift combined with a decrease in triangle n(AC) has been observed. This is in contradiction to the standard thermal decay model and seems to be a characteristic of regenerated gratings. (c) 2013 Elsevier B.V. All rights reserved.