Temperature-insensitive UV-induced Bragg gratingsin silica-based planar lightwavecircuits on Si

A novel technique is proposed to realise temperature-insensitive Bragg gratings in silica-based lightwave circuits on Si using a bimetal plate. A wavelength shift < 0.15 nm is successfully demonstrated between –40 and 80°C in the Bragg gratings written in a Mach-Zehnder interferometer.