In this paper we have studied effect of depth etching on the Bragg gratings (BGs) realized by Focused Ions Beam. This
technique has the advantage to induce a direct waveguide structuring without intermediate media, comparing to
traditional methods. A reflectivity of 96% within a window centred at 1550 nm is obtained. The effect of the depth
etching on the transmittance and the bandwidth at half maximum is demonstrated.
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