The invention relates to an attenuator for single-mode optical fibers entailing two male ferrules attached to the end of the fibers to be connected, and a female access coupler in the central part of which is a spherical thrust bearing body. A transverse axial orifice is provided in the thrust bearing body and a contact projection engages each of the male ferrules. Each male ferrule has an axial tubular protuberance that can be inserted into the orifice of the thrust bearing body and an annular groove set back from the protuberance and surrounding the back part of the latter, which groove has a wall, preferably conical in profile. The end (8) of the protuberance (6) of each of the male ferrules and the end of the corresponding immobilized fiber (7) inside said protuberance are tilted in relation to a plane perpendicular to the longitudinal axis of a ferrule; the male ferules (4) and the female access coupler (1) comprise corresponding indexing references (10, 11) that fix a predetermined angular orientation of the opposite optical fibers (7), and the axes of said fibers are offset from the optical axis of the attenuator by a fixed value.
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