Integrated Optical Ti : Cu : Linbo3 Distributed Bragg Reflector With A Photorefractive Waveguide Grating

We present a broadband DBR recorded with violet light (441.6 run) by use of a holographic technique into Ti-indiffused channel LiNbO3 waveguides, which were doped by proton-assisted copper exchange, giving unique possibility to reach an extremely high modulation of refractive index ( greater than or equal to 5*10(-4)) within photorefractive grating. In a first approach we obtain a reflectivity of 17 % and bandwidth (FWHM) of 1.2 nm for IR light with center wavelength 1534.3 run. Finally, we present the experimental data on specific spectral response of an asymmetric Fabry-Perot interferometer formed by broadband DBR and air-waveguide interface.