DE2922705

An optical fibre connector for connecting one or more pairs of single fibres in end-to-end relationship has an alignment member having two opposed and inclined datum surfaces, generally in the form of a Vee, and two tubular ferrules resting on the datum surfaces. The ferrules each have two datum positions extending along the ferrule and spaced circumferentially to cooperate with the datum surfaces. Each ferrule has a fibre receiving bore which is formed at a predetermined positional relationship to the datum positions. Rotational location is provided between ferrules and alignment member. The bore is formed by casting material in the ferrule using a mandrel, the ferrule and mandrel accurately positioned in an alignment tool which reproduces the datum surfaces of the alignment member. Build up of tolerances is avoided and slight variation in diameters of the ferrules, and lack of concentricity can be accommodated with accurate alignment of fibre ends still obtained. The invention can be used for a permanent connection, that is a splice, or for make, break and remake types of single or multiple connectors.