|Publication No: 1810||Search all ORC publications|
A novel technique for enhancing the photosensitivity of germanosilicate waveguides
G.Brambilla, V.Pruneri, L.Reekie, and D.N.Payne
Thermal treatment of GeO2:SiO2 waveguides, achieved by exposing the waveguides to CO2 laser radiation before grating writing, increases the UV photosensitivity of optical fibres. Gratings written in treated fibres show a refractive index modulation two times greater and a Bragg wavelength shift 2 nm larger than those written in untreated fibres. The thermal treatment carried out on bulk samples showed a pronounced increase of the 242nm absorption band, thus indicating that the increase of germanium oxygen deficient centres (GODC) is believed to be responsible for the higher photosensitivity.
IEE Colloquium on Optical Fibre Gratings Aston Birmingham 26-Mar (1999)
Copyright University of Southampton 2006