Tension increase correlated to refractive-index change in fibers containing UV-written Bragg gratings.
A strong axial tension increase induced by UV laser radiation is observed in the cores of single-mode optical fibers containing Bragg gratings, independently of the initial core stress. The induced index modulation of the gratings is linearly correlated to stress changes with a slope of (0.8 +/- 0.2) x 10(-4) mm(2)/kg. The phenomenon can be explained by a structural change of the glass in the fiber core into a more compact configuration.
P Y
PY
Fonjallaz
H G
HG
Limberger
R P
RP
Salathé
F
F
Cochet
B
B
Leuenberger