Abstract
Second order diffraction has been observed from Bragg gratings written within germanosilicate glass fibres. Experimental results are reported on the evolution of the first and the second order Bragg grating reflectivities as function of the uv laser shot number used for the inscription. Second order diffraction can be detected once the first order grating reflectivity has begun to saturate. Possible explanations of the second order grating formation are discussed. Our experimental results are consistent with a saturation in the photo-induced change in refractive index.
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