Author/Authors :
Chom?t، نويسنده , , M. and Berkov?، نويسنده , , D. and Mat?jec، نويسنده , , V. and Ka??k، نويسنده , , I. and Ka?ka، نويسنده , , J. and Slav?k، نويسنده , , R. and Jan??rek، نويسنده , , A. and Bittner، نويسنده , , P.، نويسنده ,
Abstract :
Sensing experiments with a long-period grating (LPG) inscribed by a CO2 laser in a single-mode fiber with an inverted-parabolic index profile in the fiber cladding were done. A single LPG with a period of 500 μm was used in experiments and spectral changes of the attenuation band centered at ≈1520 nm were measured. Responses of the LPG to temperature changes and temperature-induced refractive-index changes were investigated. An average shift of 0.56 nm/°C was obtained for the bare LPG and of 0.86 nm/°C for the LPG recoated with a polymeric layer. An overall shift of the central wavelengths was observed in experiments repeated after two weeks that can be attributed to post-curing processes in the polymeric layer.
