20 November 1996 Characterization of the light scattered from type IIA phase gratings
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Far-field properties of the optical power scattered from type IIA gratings photowritten within high NA germanosilicate fibers have been studied under various experimental conditions. First, the evolution of the out- coupling efficiency has been recorded in the course of the grating inscription. This revealed that the scattered power from fiber Bragg gratings sharply increased at the time of arrival of the type IIA photosensitivity. More, the out- coupling efficiency and the reflectivity of the type IIA grating seem to have a similar behavior under a thermal annealing process of the grating. It is then shown that the optical power detected in the far-field is scattered around a cone centered on the fiber axis, with a non-induced azimuthal distribution. The features of the observed pattern can be explained only if the UV induced index change, at the origin of he increase in the scattering efficiency, is non uniformly distributed in a plane perpendicular to the fiber axis.
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David Pureur, David Pureur, Gilbert Martinelli, Gilbert Martinelli, Pascal Bernage, Pascal Bernage, Pierre Niay, Pierre Niay, Marc Douay, Marc Douay, E. Delevaque, E. Delevaque, "Characterization of the light scattered from type IIA phase gratings", Proc. SPIE 2841, Doped Fiber Devices, (20 November 1996); doi: 10.1117/12.258965; https://doi.org/10.1117/12.258965


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