de arrangement, i.e. in a substrate, regardless if actuating mechanism is outside the substrate} [2013???01]G02B 6/3598. . . . {Switching means directly located between an optoelectronic element and waveguides, including direct displacement of either the element or the waveguide, e.g. optical pulse generation (based on changing the optical properties of the medium G02F 1/00 ; optical pulse generat