Integrated optics Bragg filters made by ion exchange and wafer bonding

A polarization-insensitive Bragg filter has been realized on a glass substrate thanks to the epoxy-free wafer bonding technique. This device is based on the combined embedding of a corrugated grating and a surface ion-exchanged waveguide, both realized on a silicate glass. With this configuration, the grating patterns are also protected from external degradation of the environment.