Temperature-insensitive UV-induced Bragg gratings in silica-based planar lightwave circuits 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/spl deg/C in the Bragg gratings written in a Mach-Zehnder interferometer.