G. Rego, R. Romero, O. Frazão, P. Marques, H. Salgado
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Apodisation of uniform fibre Bragg gratings using electric arc discharges
We report the use of the electric arc technique to apodise Fibre Bragg Gratings (FBG). Electric arc discharges applied at the ends of the grating produce a smoothing of the refractive index modulation profile which reduces the side lobes at longer wavelengths. Using this technique, a FBG was apodised with a side lobe reduction of 17 dB.