Abstract: A method for on-site connection of two transmission cables comprising optical fibres, each cable having a protective armouring enclosing a central core provided with regularly spaced grooves on its periphery. Each groove holds a fibre provided with a thin sheath of uniform thickness. After the end of one of the cables has been bared over a given length, the uncovered fibres are moved towards the exterior and secured to a holder surrounding the cable. Thereafter the core is cut perpendicularly to its axis and a grooved portion of an extension core is secured thereto; the fibres are bent back into the grooves in the said portion, and the core portion and the fibres which it bears are cut and subsequently coated with a lubricant. The same operations are performed on the end of the other cable and the two cables are clamped together under a predetermined pressure.Various devices for the embodiment of the method are described.

Abstract: Apparatus for on-site connection of two transmission cables comprising optical fibres, each cable having a protective armouring enclosing a central core provided with regularly spaced grooves on its periphery. Each groove holds a fibre provided with a thin sheath of uniform thickness. After the end of one of the cables has been bared over a given length, the uncovered fibres are moved towards the exterior and secured to a holder surrounding the cable. Thereafter the core is cut perpendicularly to its axis and a grooved portion of an extension core is secured thereto; the fibres are bent back into the grooves in the said portion, and the core portion and the fibres which it bears are cut and subsequently coated with a lubricant. The same operations are performed on the end of the other cable and the two cables are clamped together under a predetermined pressure.Various devices for on-site connection of cables with optical fibres are described.

Abstract: Method for splicing optical fiber cables which applies to those cables having an axial core and fibers disposed around the core, parallel to the cable axis or having a slight slant with respect thereto. At the places where splicing will have to be made, when the cable is laid down, the jacket of the cable is removed the fibers are glued on the core and two half-shells are disposed round the glued fibers and encase them. The half-shells are bonded to the core and fibers by gluing under pressure. When the glue has set, the half-shells together with the fibers and cable core are sawn perpendicularly to the cable axis which gives two half-shell segments. These segments have registering bores and splicing is achieved by inserting calibrated columns or pins into these bores.