Interconnection method for open installations using optical fiber transmission lines, first installs tubing on electrical conductor, then introduces optical transmission elements

摘要

Plastic tubing is installed on the earth or a phase conductor of an open line. Subsequently, the plastic tube is filled with optical waveguide elements, comprising optical fibers, optical fiber bundles or optical fiber cables. An independent claim is included for the plastic tube employed. A further claim is made for the optical waveguide element. This is a bundle with servings (see later). A means of attachment is also claimed, with holding and fixing sections for the conductor and tubing. Preferred features: The plastic tubing is drawn from a cable drum, raised to the earth- or phase conductor, and attached to it. Plastic tubing sections may be connected at the masts by plastic pipe connectors. The cable is connected using a strap in a crossed configuration. Fastening units are employed, spaced by about 2-3m. Fastening devices are attached to the tubing at the ground, and are hung for mounting in the earth- or phase conductor. The optical elements are drawn or blown into the tubing. The elements are drawn-in, having first been bundled together. They are first surrounded by and/or stranded with a swelling fleece or yarn. A sliding, low-friction plastic film, is wound on with gaps. The bundle is lubricated before introduction into the tubing using a paraffin wax, graphite powder or talc. Individual elements are blown in. Following introduction, the tubing is filled with a protective gel. A dielectric drawing-cord is used for cable introduction; this is placed in the tubing during manufacture. The elements are drawn-in using a drawing head, especially a plastic ball. The plastic tubing has ridges or grooves on its inside surface. An auxiliary plastic tube is included inside, to take individual elements. The element is an optical fiber cable with ridges or grooves on its external surface, or an outer auxiliary casing is so equipped. There individual ridges on the outer casing. Ridges are formed by waste granules. The auxiliary casing can be removed afterwards. The holder claimed, slides on the conductor. The running section takes the form of a carabiner. A fastening device is made of stainless steel or weather-resistant plastic.