Abstract: An optical fiber connector having a heat resisting spacer sleeve covering the exposed end portion without covering member of optical fiber. The outer end surface of said spacer sleeve is inclined with respect to axial direction of the optical fiber, the inclined end surface being made so as to diffuse any high-power laser beam portion diverted from the end surface of optical fiber and reaching on said end surface. At least outer end surface of the spacer sleeve and its inner surface opposed to the optical fiber are made such as to diffuse high-power laser beam. The optical fiber and inner surface of the spacer sleeve opposed thereto are opposed directly to each other without any intermediate substance therebetween.

Abstract: The optical fiber connector is characterized by a cylindrical and ceramic ferrule having a center-axial bore of inner diameter allowing for concentrical insertion of an optical fiber depending upon outer diameter of said optical fiber deprived of its covering layer, and having outer surface coaxial with said center-axial bore, said ferrule being fixed in the connector body of said connector so as to project from said connector body by a predetermined length. Positioning between optical fiber coaxially held in ferrule and corresponding lens unit becomes easier, thereby to have high-power laser beams positively focused on the end surface of the optical fiber and to prevent burning damages of components of the optical fiber connector. Further, once the positioning between lens units and optical fiber has been carried out, any later positioning can be omitted.