Title :
Thermal decay of fiber Bragg gratings written in boron and germanium codoped silica fiber
Author :
Baker, Stephen R. ; Rourke, Howard N. ; Baker, Vernon ; Goodchild, Darren
Author_Institution :
Nortel Technol., Harlow, UK
fDate :
8/1/1997 12:00:00 AM
Abstract :
Fiber Bragg gratings (FBGs) have been written in silica fiber codoped with boron and germanium, using a continuous-wave (CW) 244-nm laser. The thermal decay of the gratings written with and without hydrogen loading is examined over a period in excess of 5000 h. It is shown that the thermal decay of the nonhydrogen loaded gratings is well explained by the power law model proposed by Erdogan. Gratings written in hydrogen loaded fiber, however, do not obey the power law model. A new model is presented based on a log time representation which can be used to predict the decay characteristics of gratings written in hydrogen loaded fiber
Keywords :
boron; diffraction gratings; germanium; laser beam effects; life testing; optical fibre fabrication; optical fibre testing; optical fibres; 244 nm; 5000 h; CW 244-nm laser; boron/germanium codoped silica fiber; continuous-wave; decay characteristics; fiber Bragg gratings; hydrogen loaded fiber; life testing; log time representation; nonhydrogen loaded gratings; optical fibre testing; optical fibre theory; power law model; silica fiber; thermal decay; Boron; Bragg gratings; Fiber gratings; Fiber lasers; Germanium; Hydrogen; Laser modes; Predictive models; Silicon compounds; Thermal loading;
Journal_Title :
Lightwave Technology, Journal of
