Abstract

We report what is to our knowledge the first characterization at high temperatures of long-period fiber gratings written in Ge-free air–silica microstructure fiber. The gratings written with the electric-arc technique suffer a low shift of the resonance wavelengths when the temperature is increased from 20 °C to 1200 °C. This shift is studied and compared with that of a long-period fiber grating written in a standard single-mode fiber by the same technique. Good thermal stability of the grating and of the fiber after annealing at 1200 °C for 1 h is demonstrated.

© 2004 Optical Society of America

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