An arrangement for coupling a laser diode and a monomode light waveguide, wherein a fine adjustment is particularly simple. The laser diode is a gain-guided diode having an end face coacting with an end face of the optical waveguide to form a coupling location and the arrangement includes a feedback arrangement for conducting a part of the light coupled from the laser diode into the light waveguide back through the waveguide and back into the laser diode. The feedback means comprises either one or more metallized rings having a width of a few light wavelengths being applied on a cylindrical surface of the monomode glass fiber forming the monomode light waveguide at a distance of a few micrometers from the coupling location, one or more notches in the outer surface of the fiber or combination of rings and notches.