Lightning protection layer stranded optical cable

Abstract

The invention relates to a lightening protection layer stranded optical cable, comprising a cable core and a sheath sheathed outside the cable core. The cable core comprises a strengthened core and at least one fiber bundle tube composed of a loose tube and internally mounted optical fiber of the loose tube as well as a stuffer fiber paste surrounding the strengthened core; the sheath comprises a fastening yarn layer, a steel-plastic composite layer and an outer sheath that are coated on the cable core from inner to outer in turn, and water-proof fiber paste is filled between the cable core and the fasten yarn layer; the invention is characterized in that the strengthened core is a glass fiber reinforced plastic (FRP) bar; the external part of the glass fiber reinforced plastic (FRP) bar is provided with a polyethylene coating layer; a polyethylene buffer layer is installed between the fasten yarn layer and the steel-plastic composite layer; and the outer sheath is a polyethylene outer sheath. The optical cable has the following beneficial effects: the optical cable has good lightening protection performance; the polyethylene buffer layer is added and can prevent the cable core from being damaged, thereby realizing firm structure of optical cable, safe and reliable work; and the optical cable can be used in lightning-prone area, in particular being used as outdoor optical fiber of military network.

Description

technical field [0001] The invention relates to a stranded optical cable for outdoor use, in particular to a stranded optical cable for lightning protection. Background technique [0002] Due to its excellent transmission characteristics such as large capacity, low attenuation, and strong anti-interference ability, optical cable has become an important carrier of communication network in the information society supported by modern communication technology, and is widely used as core network, metropolitan area network and access network. The outdoor optical cable is used for network access for information transmission, communication and monitoring. The existing outdoor stranded optical cable mainly includes a cable core and a sheath set outside the cable core. It is composed of high-modulus plastic loose tube, optical fiber and filled fiber paste; the optical fiber cable is centered on the reinforcing core, and the optical fiber bundle tube is stranded around the reinforcing...

AI Technical Summary

Problems solved by technology

[0003] At present, metal phosphating steel wire is usually used as the strengthening core of optical cables. Although the metal strengthening core has strong tensile properties, when it is used in special applications such as lightning-prone areas, discharge will occur between the metal strengthening core and the metal of the steel-plastic composite layer. The optical cable is broken down by lightning, causing damage to the optical fiber in the optical cable and interrupting communication

In addition, there is only a soft and thin layer of binding yarn between the steel-plastic composite layer and the cable core in the existing optical cable, which will damage the optical fiber bundle tube of the cable core under the hard contact force of the steel-plastic composite layer.

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