Abstract:
It is disclosed a cable assembly comprising a common figure-8 outer jacket comprising a first lobe and a second lobe, wherein the first lobe surrounds an electric core with a relevant first extruded inner sheath housing a strength member; and the second lobe surrounds an optical core with a relevant second extruded inner sheath.
Abstract:
It is disclosed an optical fiber unit for air-blown installations comprising a number of optical conductors (2), a first layer (3i) of resin material, a second layer (3o) of resin material radially outer to the first layer (3i) of resin material and a sheath (4) of a thermoplastic material, wherein said second layer (3o) of resin material has a Secant Modulus higher than a Secant Modulus of said first layer (3i) of resin material and wherein said sheath (4) of a thermoplastic material is over and in close contact with said second layer (3o) of resin material.
Abstract:
It is disclosed an optical cable (1, 2, 3, 4) comprising an optical core (100, 200, 300, 400) and a sheath (101, 201, 301, 401) enclosing the optical core (100, 200, 300, 400). The optical core (100, 200, 300, 400) comprises a number of optical units (110, 210, 310, 410) having respective colors and being wound about a longitudinal axis of the cable (1, 2, 3, 4). The sheath (101, 201, 301, 401) comprises at least one non opaque longitudinal section (106, 206, 306, 406) through which a sequence of colors of the optical units (110, 210, 310, 410) is visible from outside the cable (1, 2, 3, 4). The color sequence acts as an identifier for the cable (1, 2, 3, 4). The cable (1, 2, 3, 4) may therefore be easily identified (e.g. amongst other cables laid down within the same duct) by a simple visual inspection of the cable's inner structure through the non opaque section(s) (106, 206, 306, 406) of its external sheath (101, 201, 301, 401).
Abstract:
It is disclosed an optical cable comprising an optical core and an external sheath surrounding the optical core, wherein the external sheath comprises an inner layer circumferentially enclosing the optical core and an outer layer circumferentially enclosing the inner layer and comprising at least one longitudinal cavity accessible from outside the external sheath and extending through at least a portion of the outer layer thickness. The inner and outer layers of the external sheath are made of a first material having a first tensile strength, while the cavities in the outer layer are filled with a second material having a second tensile strength lower than the first tensile strength.
Abstract:
It is disclosed an optical fiber unit for air-blown installations comprising a plurality of optical fiber sub-units and a central member, wherein the optical fiber sub-units are stranded around the central member; wherein each of the optical fiber sub-units comprises a number of optical fibres, an inner layer which is radially outer to the optical fibres and an outer layer which is radially outer to the inner layer, wherein the outer layer comprises particulate material which is partially embedded into the outer layer; and wherein the optical fiber unit further comprises a binder for keeping the stranded optical fiber sub-units in a proper arrangement.
Abstract:
It is disclosed an optical cable (1, 2, 3, 4, 5, 6) comprising an optical core (100, 200, 300, 400, 500, 600) and an external sheath (101, 201, 301, 304, 305, 306)surrounding the optical core. The external sheath comprises a first material having a first, higher fracture toughness and a second material having a second, lower fracture toughness. The first and second materials are arranged so that the second, lower fracture toughness material is accessible from outside the cable along at least one longitudinally extending area of the sheath outer surface. For accessing the optical core of the cable, a short longitudinal cut (namely, few centimetres) is made with a blade in the accessible second, lower fracture toughness material. Then, its cut edges are pulled apart by hand. The pulling force causes the lower fracture toughness material to fracture, thereby propagating the initial short cut longitudinally along the sheath through its whole thickness.
Abstract:
It is disclosed an optical cable comprising a buffer tube(1) housing at least one optical fiber(2), a sheath (3) surrounding such buffer tube (1) and at least one longitudinal strength member (4) embedded in the sheath, in which at least one separation element (7) is provided between a portion of the outer surface of the buffer tube (1) and the inner surface of the sheath, laying in an axial plane (e) not containing the at least one strength member (4).