An optical displacement transducer includes a transducing element comprising at least a first optical fiber, having a first end face substantially aligned along an axis and positioned with a small gap between said first end face and a second end face of a reception assembly, the transducer further comprising at least a light source coupled for transmission to first optical fiber and at least a photo-detector coupled for reception to the second optical fiber. The first end face and the second end face are displaceable along the axis and relatively with respect to each other, in order to follow the displacement of points associated to the first end face and second end face. The transducer is effective in detecting axial displacement simply and low cost.