Title :
Study of the photosensitivity at 193 nm and comparison with photosensitivity at 240 nm influence of fiber tension: type IIa aging
Author :
Riant, Isabelle ; Haller, Fabrice
Author_Institution :
Alcatel Alsthom Recherche, Marcoussis, France
fDate :
8/1/1997 12:00:00 AM
Abstract :
The photosensitivity in germanosilicate fibers at 193 nm is studied and compared with that at 240 nm. As previously shown, it is found that, without hydrogen sensitization, the initiation of the phenomenon is a one-photon process for a high germanium content fiber and a two-photon process for a low germanium content fiber. However, when the low germanium content fiber is previously loaded with hydrogen, it is observed that the photo-induced index change initial growth rate varies linearly with the fluence, invoking a one-photon process. It is shown that external strains applied to the fiber strongly influence the mechanisms of the photosensitivity at 193 nm. Finally, an aging study is carried out
Keywords :
ageing; deformation; germanate glasses; optical fibre testing; sensitivity; ultraviolet spectra; 193 nm; 240 nm; external strains; fiber tension; germanosilicate fibers; high germanium content fiber; hydrogen sensitization; initial growth rate; low germanium content fiber; one-photon process; optical fibre testing; photo-induced index change; photosensitivity; two-photon process; type IIa aging; Absorption; Aging; Bragg gratings; Capacitive sensors; Fiber gratings; Germanium; Glass; Hydrogen; Optical fiber devices; Optical fibers;
Journal_Title :
Lightwave Technology, Journal of
