Abstract

Bragg gratings have been written in an optical fiber with a core made from ternary SiO2: SnO2: Na2O glass and a SiO2 cladding. The presence of Na2O allows for higher concentrations of SnO>2 , which are believed to be responsible for the photorefractive response of this composition. In these preliminary experiments significant refractive-index modulations, up to 6.2×10-4 , have been achieved with a 248-nm excimer laser and a phase mask to write gratings for reflectivity at ~1.5µm . The induced refractive-index changes show enhanced temperature stability, and there is no sign of any erasure up to temperatures exceeding 600 °C.

© 2000 Optical Society of America

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