The optical modulator includes optical modulation units. The thin-film layer sequence is formed on a growth substrate. The unit includes an array of radio opaque fiducials arranged for use in image calibration for an imaging system. This IO integrated circuit includes high-speed IO circuits and energy-efficient driver and receiver circuits and communicates with optical devices on the optical integrated circuit. The floor covering includes at least a first layer and a second layer, wherein the first layer includes a particulate material at least partially embedded therein, and the second layer is capable of providing a sound attenuation effect with an acoustic impact sound reduction of at least about 15 decibels.