The invention relates to an optical sensor module (1) in a semiconducting body which comprises a semiconducting laser device (1a) for emitting coherent radiation (3), a detector element (1b) having a radiation-detecting zone (12b), and a waveguide (12c), whereby the detector element (1b) is linked with the semiconducting device (1) via the waveguide (12c). The inventive sensor module is characterized in that the waveguide (12c) is positioned in a direction at an angle to the main direction of radiation of the coherent radiation (3) emitted by the semiconductor laser device (1a). The invention also relates to a method for measuring the relative motion of an object (2) in relation to such an optical sensor module (1).