Apodised fiber Bragg gratings fabricated with a uniform phase mask using Gaussian beam laser

Abstract

A new exposure scheme for fabricating apodised fiber Bragg gratings by the use of a uniform phase mask and a Gaussian beam laser is demonstrated. Average refractive index is kept nearly constant along the grating to derive a side lobe suppression of 20 dB in the shorter wavelength. This scheme allows the writing of truly apodized fiber Bragg gratings. (C) 2000 Elsevier Science Ltd. All rights reserved.