ANNEALING OF BRAGG GRATINGS IN HYDROGEN-LOADED OPTICAL-FIBER

被引:81
作者
PATRICK, H [1 ]
GILBERT, SL [1 ]
LIDGARD, A [1 ]
GALLAGHER, MD [1 ]
机构
[1] ERICSSON COMPONENTS AB,FIBER OPT RES CTR,S-16481 KISTA,SWEDEN
关键词
D O I
10.1063/1.360753
中图分类号
O59 [应用物理学];
学科分类号
摘要
We have conducted a detailed study of the thermal stability of Bragg gratings written in hydrogen-loaded and unloaded germanium-doped optical fiber. Interference of either continuous-wave or pulsed ultraviolet light was used to induce the index modulation gratings. Some gratings were kept at room temperature and others were annealed at fixed temperatures for 20-20 h. For temperatures between room temperature and 350 degrees C, gratings in the hydrogen-loaded fiber showed significantly greater decay than those in the unloaded counterpart. The ultraviolet-induced index modulation in hydrogen-loaded fiber was reduced by 40% after 10 h at 176 degrees C, whereas it was reduced by only 5% in unloaded fiber under the same conditions. The annealing behavior of gratings written using the pulsed source was identical to that of gratings written with the continuous-wave source, and the thermal stability of gratings in hydrogen-loaded fiber did not depend on the magnitude of the index modulation. We also observed that the annealing of ultraviolet-induced OH absorption in the hydrogen-loaded fiber was not correlated with the grating decay. Our annealing results show that the species responsible for the index change in the hydrogen-loaded fiber are less stable than those in the unloaded fiber. (C) 1995 American Institute of Physics.
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页码:2940 / 2945
页数:6
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