Abstract: An optical cable for communication includes at least one retaining element blocked with respect to the water propagation as well as a process for manufacturing such an optical cable. The optical cable includes, in addition to the retaining element, at least two transmission elements housed within the retaining element and a water swellable yarn housed within the retaining element. The water swellable yarn is selected according to the following equation: V w V TF = k V t + R ( I ) in which Vw is the volume of the water swellable yarn after swelling upon contact with water; VTF is the total free volume in the retaining element; k is a constant?180; R is a constant?1.4; and Vt is the free volume per each transmission element. Advantageously, the optical cable is water-blocked and the water swellable yarn does not induce microbending effects on the transmission elements.

Abstract: A method and apparatus for manufacturing an optical cable comprising at least one metal tube housing at least one optical fiber and having a predetermined excess fiber length (EFL) is described. In this method the metal tube is plastically deformed and shortened by a predetermined amount (St) greater than the predetermined EFL and is plastically deformed after shortening to provide a controlled elongation thereof so as to reach the predetermined excess fiber length. An optical cable so manufactured has a local excess fiber length (EFL) varying of or less than 0.2% along the longitudinal extension of the cable with respect to an average EFL of the cable.

Abstract: A method and apparatus for manufacturing an optical cable comprising at least one metal tube housing at least one optical fiber and having a predetermined excess fiber length (EFL) is described. In this method the metal tube is plastically deformed and shortened by a predetermined amount (St) greater than the predetermined EFL and is plastically deformed after shortening to provide a controlled elongation thereof so as to reach the predetermined excess fiber length. An optical cable so manufactured has a local excess fiber length (EFL) varying of or less than 0.2% along the longitudinal extension of the cable with respect to an average EFL of the cable.

Abstract: A method and apparatus for manufacturing an optical cable comprising at least one metal tube housing at least one optical fiber and having a predetermined excess fiber length (EFL) is described. In this method the metal tube is plastically deformed and shortened by a predetermined amount (St) greater than the predetermined EFL and is plastically deformed after shortening to provide a controlled elongation thereof so as to reach the predetermined excess fiber length. An optical cable so manufactured has a local excess fiber length (EFL) varying of or less than 0.2 % along the longitudinal extension of the cable with respect to an average EFL of the cable.

Abstract: A method for manufacturing an optical cable for communication includes at least one micromodule, said micromodule being blocked with respect to the propagation of water. The method includes the steps of providing at least one optical fiber; embedding the at least one optical fiber in a pseudoplastic filling compound having a viscosity of 3 Pa·s to 30 Pa·s, preferably 7 Pa·s to 25 Pa·s at a shear rate of 10 s?1 and at a temperature of 100° C., and a cross-over lower than 30 Hz, preferably 5 Hz to 25 Hz, at a temperature of 100° C.; and extruding a retaining element made of a thermoplastic polymeric composition around the at least one optical fiber so embedded in the filling compound to obtain a micromodule.

Abstract: An optical cable for communication includes at least one retaining element blocked with respect to the water propagation as well as a process for manufacturing such an optical cable. The optical cable includes, in addition to the retaining element, at least two transmission elements housed within the retaining element and a water swellable yarn housed within the retaining element. The water swellable yarn is selected according to the following equation: V w V TF = k V t + R ( I ) in which Vw is the volume of the water swellable yarn after swelling upon contact with water; VTF is the total free volume in the retaining element; k is a constant?180; R is a constant?1.4; and Vt is the free volume per each transmission element. Advantageously, the optical cable is water-blocked and the water swellable yarn does not induce microbending effects on the transmission elements.

Abstract: An optical cable for communication includes at least one retaining element blocked with respect to the water propagation as well as a process for manufacturing such an optical cable. The optical cable includes, in addition to the retaining element, at least two transmission elements housed within the retaining element and a water swellable yarn housed within the retaining element. The water swellable yarn is selected according to the following equation: V w V TF = k V t + R ( 1 ) in which Vw is the volume of the water swellable yarn after swelling upon contact with water; VTF is the total free volume in the retaining element; k is a constant ?180; R is a constant ?1.4; and Vt is the free volume per each transmission element. Advantageously, the optical cable is water-blocked and the water swellable yarn does not induce microbending effects on the transmission elements.

Abstract: A telecommunication fiber optic cable for gas pipeline application has a built-in leakage detecting device. The cable has an optical core including a number of telecommunication optical fibers, an outer jacket covering the optical core, and one or more gas leakage detector optical fibers. One or more gas leakage detector optical fibers are enclosed within the outer jacket. Preferably, the cable has a linearly extending rod reinforcing system having strength rods that force the cable to bend in a preferential bending place. Preferably, the leakage detector optical fibers are located at, or close to, a plane that is substantially orthogonal to the preferential bending plane and passing through the cable neutral axis.

Abstract: An optical cable is manufactured in a single continuous process starting directly from at least an optical preform, by means of a fiber/cable integrated manufacturing line including a fiber(s) drawing assembly for the production of one or more optical fibers from respective optical preforms, and a cabling assembly for producing the optical cable from the optical fiber(s), the cabling assembly comprising a fiber buffering assembly for the application of a loose or tight coating to the optical fiber(s), and a strengthening and sheathing sub-assembly for applying one or more reinforcing and protective layers to the buffered optical fiber(s).

Abstract: A method and apparatus for manufacturing an optical cable comprising at least one metal tube housing at least one optical fiber and having a predetermined excess fiber length (EFL) is described. In this method the metal tube is plastically deformed and shortened by a predetermined amount (St) greater than the predetermined EFL and is plastically deformed after shortening to provide a controlled elongation thereof so as to reach the predetermined excess fiber length. An optical cable so manufactured has a local excess fiber length (EFL) varying of or less than 0.2% along the longitudinal extension of the cable with respect to an average EFL of the cable.

Abstract: A method for manufacturing an optical cable for communication includes at least one micromodule, said micromodule being blocked with respect to the propagation of water. The method includes the steps of providing at least one optical fiber; embedding the at least one optical fiber in a pseudoplastic filling compound having a viscosity of 3 Pa·s to 30 Pa·s, preferably 7 Pa·s to 25 Pa·s at a shear rate of 10 s?1 and at a temperature of 100° C., and a cross-over lower than 30 Hz, preferably 5 Hz to 25 Hz, at a temperature of 100° C.; and extruding a retaining element made of a thermoplastic polymeric composition around the at least one optical fiber so embedded in the filling compound to obtain a micromodule.

Abstract: An optical cable for communication includes at least one micromodule, wherein the micromodule is blocked with respect to the propagation of water. The at least one micromodule includes at least one optical fiber, a retaining element for housing the at least one optical fiber, and a thixotropic filling compound arranged within the retaining element. The filling compound is thixotropic, has a viscosity higher than or equal to 700 Pa·s at zero shear rate and at a first temperature of 20° C., a loss modulus G? lower than or equal to 3000 MPa at 1 Hz and at a second temperature of ?45° C., and is compatible with the retaining element.

Abstract: An optical cable for communication includes at least one retaining element blocked with respect to the water propagation as well as a process for manufacturing such an optical cable. The optical cable includes, in addition to the retaining element, at least two transmission elements housed within the retaining element and a water swellable yarn housed within the retaining element. The water swellable yarn is selected according to the following equation: V w V TF = k V t + R ( 1 ) in which VW is the volume of the water swellable yarn after swelling upon contact with water; VTF is the total free volume in the retaining element; k is a constant ?180; R is a constant ?1.4; and Vt is the free volume per each transmission element. Advantageously, the optical cable is water-blocked and the water swellable yarn does not induce microbending effects on the transmission elements.

Abstract: An optical cable for communication includes at least one micromodule, wherein the micromodule is blocked with respect to the propagation of water. The at least ones micromodule includes at least one optical fiber, a retaining element for housing the at least one optical fiber, and a thixotropic filling compound arranged within the retaining element. The filling compound is thixotropic, has a viscosity higher than or equal to 700 Pa-s at zero shear rate and at a first temperature of 20° C., a loss modulus G? lower than or equal to 3000 MPa at 1 Hz and at a second temperature of ?45° C., and is compatible with the retaining element.

Abstract: An optical cable is manufactured in a single continuous process starting directly from at least an optical perform, by means of a fiber/cable integrated manufacturing line (50) including a fiber(s) drawing assembly (100) for the production of one or more optical fibers from respective optical preforms, and a cabling assembly (200) for producing the optical cable from the optical fiber(s), the cabling assembly comprising a fiber buffering assembly (200a) for the application of a loose or tight coating to the optical fiber(s), and a strengthening and sheathing sub-assembly (200b) for applying one or more reinforcing and protective layers to the buffered optical fiber(s).

Abstract: An optical fiber cable has a highly reduced diameter. The cable has a central strength member; a number of tubes containing loosely arranged optical fibers, each tube having a thickness, and each optical fiber having a coating; and a protective outer jacket, wherein the filling coefficient of optical fibers in at least one loose tube is ?45°/0. The tubes are made of a material having an elasticity modulus ?700 MPa; and the optical fibers are SM-R fibers having a microbending sensitivity ?4.0 dB·km?1/g·mm?1 at a temperature of about ?30° C. to +60° C. at about 1550 nm.

Abstract: A telecommunication optical fiber cable and in particular a reduced diameter optical cable with improved installation features for use in the end part of an access telecommunication network. The optical fiber cable has a number of optical fibers; at least a core tube containing the optical fibers; a jacket surrounding the core tube; and at least one strength rod spaced from the central axis, the cable having a twisting stiffness G*Jp, wherein G is the elastic shear modulus; and Jp is the polar moment of inertia of a cable section, wherein the twisting stiffness G*Jp is lower than or equal to 0.10 Nm2, preferably lower than or equal to 0.05 Nm2, and more preferably lower than or equal to 0.02 Nm2. The cable is profitably installable by a blown method.

Abstract: An optical cable having an optical core with a strength member and optical fibers embedded in a thermoplastic material. The optical core has a joint section having substantially the same diameter as the one of the optical core. The joint section has a jointed strength member and a plurality of spliced optical fibers, the jointed portion of the strength member and the spliced portion of the optical fibers being embedded into a cured polymeric material. A method for manufacturing an optical core is also disclosed.

Abstract: An optical fiber cable has a highly reduced diameter. The cable has a central strength member; a number of tubes containing loosely arranged optical fibers, each tube having a thickness, and each optical fiber having a coating; and a protective outer jacket, wherein the filling coefficient of optical fibers in at least one loose tube is ?45°/0. The tubes are made of a material having an elasticity modulus ?700 MPa; and the optical fibers are SM-R fibers having a microbending sensitivity ?4.0 dB·km?1/g·mm?1 at a temperature of about ?30° C. to +60° C. at about 1550 nm.

Abstract: 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/dm3 and tensile modulus at 20° C. between 300 and 700 MPa.