Pirelli Cavi E Sistemi S.p.a.

Pirelli & C. S. P. a.

Enrico Consonni

Alessandro Ginocchio

Giovanni Brandi

Flavio Casiraghi

Feliciano Cecchi

Agusti Valls Prats

An optical cable having at least one element for the transmission of optical signals and a structure that is able to protect the at least one element. The structure is a multilayer structure and is arranged in a position radially external to the at least one element and has a) at least one first covering layer of polymeric material in a position radially external to the at least one element; b) at least one covering layer of foamed polymeric material in a position radially external to the at least one first covering layer, and c) at least one second covering layer of polymeric material in a position radially external to the at least one covering layer of foamed polymeric material. The foamed polymeric material has a density between 0.3 and 0.7 kg/dmand tensile modulus at 20&#xb0; C. between 300 and 700 MPa.

Optical cable provide with a mechanically resistant covering

Optical cable () for telecommunications, having low PMD and attenuation values, said cable comprising a central element (), a plurality of optical fibres () and a layer of polymer material () devoid of discontinuities and incorporating both the central element () and the optical fibres, each of the optical fibres () being ranged along an open helix trajectory along which it has a torsion with a mean value of zero and a local maximum value of between 0.05 turns/m and 1 turns/m.

Optical cable for telecommunications

A submarine optical cable having a central polymeric buffer tube, said cable being particularly suitable for long-haul repeatered systems. A longitudinal reinforcing element is embedded into the walls of the central polymeric buffer tube which is of relatively small dimensions. The presence of said reinforcing element allows a precise control over the excess fiber length within the buffer tube. This reinforcing element is of relatively small diameter, in order to comply with the requirements of reduced dimensions of the buffer tube. Notwithstanding this relatively small diameter, said longitudinal reinforcing element allows for a good control over the longitudinal shrinkage of the polymeric buffer tube within the submarine cable.

Submarine optical cable resistant to longitudinal water propagation

An optical fibre cable includes at least one optical fibre and a polymer-based outer sheath, characterized in that the sheath is an extruded double-layer sheath, including an extruded first inner polymer layer and an extruded second outer polymer layer. The first inner polymer layer is substantially devoid of tracking resistance, and the second outer polymer layer has high tracking resistance. The second outer polymer layer includes a polymeric mixture containing a polymer and an inorganic oxide or hydroxide in an amount of at least 40% by weight with respect to the total weight of the second outer polymer layer.

Optical fibre cable having high tracking resistance

Optical cable comprising a reinforcing tube with diameter less than 7 mm, obtained from a metal strip gradually deformed until it assumes a final configuration with overlapping outer edges, at least one optical fiber arranged loosely in the tube, a water-blocking fluid occupying 75% of the useful internal area of the tube and a plastic sheath around the tube. The water-blocking fluid is deposited when the strip is curved with edges a predetermined distance apart.

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Seregno, Italy

Enrico Consonni