An optical-delay-line assembly (1) comprises a substrate (2), an optical assembly (3), and a movement device (4). the optical assembly (3) is arranged on the substrate (2) and is configured to guide an optical signal (s1) generated from a source of electromagnetic waves (5), preferably from an optical input (6) of the substrate (2) to an optical output (7) of the substrate (2), along an optical path (p1). the movement device (4), when being exposed to energy, is configured to deform at least in the region of exposure to the energy, whereby at least part of the movement device (4) is movable with respect to the substrate (2) and configured to move at least part of the optical assembly (3) with respect to the substrate (2), and whereby an optical path length (l1) of the optical path (p1) of the optical signal (s1) is changeable.