Open AccessA study of regenerated gratings produced in germanosilicate fibers by high temperature annealing
Author(s) -
Somnath Bandyopadhyay,
John Canning,
Palas Biswas,
Michael Stevenson,
Kamal Dasgupta
Publication year - 2011
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.001198
Subject(s) - materials science , annealing (glass) , grating , optics , optical fiber , doping , fiber bragg grating , dopant , diffraction grating , refractive index , optoelectronics , composite material , wavelength , physics
In light of recent proposals linking structural change and stresses within regenerated gratings, the details of regeneration of a seed Type-I Bragg grating written in H2 loaded germanosilicate fiber annealed at high temperatures (~900°C) are systematically explored. In particular, the influence of the strength of the grating, the effect of GeO2 doping concentration and the annealing conditions on regeneration are studied. We show that the role of dopants such as Ge and F contribute nothing to the regeneration, consistent with previous results. Rather, they may potentially be detrimental. Strongest regenerated gratings with R ~35% from a 5mm seed grating could be obtained in fibres with the lowest GeO2 concentrations such as standard telecommunications-compatible grade fibre.