UV written 13 dB reflection filters in hydrogenated low loss planar silica waveguides

UV written holographic gratings in hydrogenated GeO/sub 2/-SiO/sub 2/ planar waveguides which have given a reflectivity of 13 dB at 1555 nm with a bandwidth of 0.6 nm are reported. The index modulation within the gratings was calculated to be 5*10/sup -4/. In addition the waveguides are low loss from 1300 to 1600 nm.< >