Abstract: In an arrangement for coupling an optical waveguide to an optical device, particularly for a laser application, or to another optical waveguide, the optical waveguide is held in a fiber plug which can be connected with a countercoupling part in which the end of the waveguide is introduced into a fixed centering sleeve and centered. The discardable fiber plug of simple construction is fastened on the elastic fiber cladding of the optical waveguide, and the projecting front end of the waveguide is bared down to the optical fiber cladding. The optical waveguide fiber which is introduced into said centering sleeve is bared, and centering is facilitated by the elasticity of the fiber. The centering sleeve may be provided with an introducing cone, and may have an elastic diameter, and the fiber plug may be fastened on the countercoupling part by means of instant plug-in connections.