Abstract
The influence of isochronal and isothermal annealing on grating regeneration in single mode silica optical fibers has been investigated. By rapid annealing of Type-I grating under isothermal conditions we demonstrated that the underlying processes in the fiber that contribute toward grating regeneration work best around a certain temperature and there is a turn-around-point or roll-over of strength of grating regeneration. We validate the existence of “regeneration turn-around-point” with Type-I gratings inscribed using a 248 nm laser and a 213 nm laser as well. Attaining a “regeneration turn-around-point” may be set as a milestone on the way to optimizing regenerated fiber Bragg gratings (RFBG) and subsequently to develop high quality FBG sensors suitable for use at elevated temperatures.
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