A self-aligned optical coupler for coupling light between an optical waveguide and an optical fiber. The optical fiber is held with a ferrule fitting. The ferrule is inserted in a connector receptacle at one end. The waveguide has a forty-five degree reflector at its end. The waveguide is attached to a cover. The cover is attached to another end of the connector receptacle so that the reflector and the end of the optical fiber face each other. The features on the waveguide and the ferrule are aligned with each other to provide optical alignment between the reflector of the waveguide and the end of the fiber.