摘要:
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.
摘要翻译:用于通信的光缆包括至少一个相对于水传播阻挡的保持元件以及用于制造这种光缆的工艺。 除了保持元件之外,光缆还包括容纳在保持元件内的至少两个传输元件和容纳在保持元件内的水可溶胀纱线。 水溶胀性纱线根据以下等式选择:V w V TF = k V t + R(I)其中Vw是在与水接触后膨胀后的水溶胀纱线的体积; VTF是保持元件中的总自由体积; k是常数≧180; R为常数≧1.4; Vt是每个传输元件的自由音量。 有利地,光缆被水封闭,并且水可溶胀纱线不会对传输元件引起微弯曲效应。
摘要:
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.
摘要:
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.
摘要翻译:用于通信的光缆包括至少一个相对于水传播阻挡的保持元件以及用于制造这种光缆的工艺。 除了保持元件之外,光缆还包括容纳在保持元件内的至少两个传输元件和容纳在保持元件内的水可溶胀纱线。 水溶胀性纱线根据以下等式选择:V w V TF = k V t + R(I)其中Vw是在与水接触后膨胀后的水溶胀纱线的体积; VTF是保持元件中的总自由体积; k是常数≧180; R为常数≧1.4; Vt是每个传输元件的自由音量。 有利地,光缆被水封闭,并且水可溶胀纱线不会对传输元件引起微弯曲效应。
摘要:
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.
摘要翻译:用于通信的光缆包括至少一个相对于水传播阻挡的保持元件以及用于制造这种光缆的工艺。 除了保持元件之外,光缆还包括容纳在保持元件内的至少两个传输元件和容纳在保持元件内的水可溶胀纱线。 水溶胀性纱线根据以下等式选择:V w V TF = k V t + R(1)其中Vw是与水接触后膨胀的水溶胀纱线的体积; VTF是保持元件中的总自由体积; k是常数≧180; R为常数≧1.4; Vt是每个传输元件的自由音量。 有利地,光缆被水封闭,并且水可溶胀纱线不会对传输元件引起微弯曲效应。
摘要:
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.
摘要:
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.
摘要:
Telecommunication cable having an elongated element housing at least one transmitting element. The elongated element has a water-soluble polymeric composition of a vinyl alcohol/vinyl acetate copolymer having a saponification degree of about 60% to about 95%; a plasticizer; a hydrolysis stabilizer compound having a chelant group having two hydrogen atoms bonded to two respective heteroatoms selected from nitrogen, oxygen and sulfur. The two hydrogen atoms have a distance between each other of 4.2×10−10 m to 5.8×10−10 m. The stabilizer compound is present in an amount of at least 0.75 mmoles per 100 g of copolymer. The elongated element is in particular a buffer tube housing a plurality of optical fibers. The presence of the stabilizer reduces the increase of the hydrolysis degree of the copolymer upon aging, thus maintaining the desired water blocking properties of the copolymer.
摘要:
An optical fiber having at least one epoxidized polyolefin based polymer coating. The coating is formed from a crosslinkable composition having (a) at least one epoxidized polydiene oligomer having a first and a second end, the oligomer having at least one hydrocarbon chain that is substantially free of ethylenic double bonds, at least one epoxide group at the first end and at least one reactive functional group at the second end; (b) at least one hydrogenated polydiene oligomer having at least one reactive functional group capable of reacting with the epoxide groups; and (c) at least one photo-initiator. Preferably, the coating is a primary coating coated with a secondary coating.
摘要:
An optical cable has a cable core including at least one tube loosely accommodating optical fibers, the at least one tube being accommodated within a jacket embedding at least two strength members, the cable core and the jacket comprising combustible material. A ratio of core combustible material/jacket combustible material is lower than 60 vol %. The jacket is made of a composition having hardness of at least 60 Shore D and a LOI higher than 35%.
摘要:
Optical cable having at least one tubular element of polymeric material and at least one transmission element housed within said tubular element. The polymeric material is made from a polymeric composition having (a) at least one olefin polymer; (b) at least one inorganic filler; and (c) at least one olefin polymer including at least one functional group. The at least one olefin polymer including at least one functional group (c) is present in the polymeric composition in an amount of about 3 parts by weight to about 10 parts by weight, preferably about 5 parts by weight to about 8 parts by weight, with respect to 100 parts by weight of the olefin polymer (a).