Optical fiber cable is manufactured to meet optical, mechanical or environmental performance specifications. It is a communication cable that uses one or more optical fibers placed in a sheath as a transmission medium and can be used alone or in groups. components.
Optical cables are mainly composed of optical fibers (glass filaments as thin as hair), plastic protection and plastic sheaths. There are no metals such as gold, silver, copper and aluminum in the optical cables, and generally they have no recycling value. Optical fiber cable is a kind of communication line in which a certain number of optical fibers form a cable core according to a certain method, which is covered with a sheath, and some are also covered with an outer sheath to realize optical signal transmission. That is: a cable formed by an optical fiber (optical transmission carrier) through a certain process.
The basic structure of optical cable is generally composed of cable core, reinforcing steel wire, filler and sheath, etc. In addition, there are waterproof layer, buffer layer, insulated metal wire and other components as needed.
fiber optic cable
Optical cable type
1. According to the different transmission performance, distance and use, optical cables can be divided into user optical cables, local telephone optical cables, long-distance optical cables and submarine optical cables.
2. According to the different types of optical fibers used in optical cables, optical cables can be divided into single-mode optical cables and multi-mode optical cables.
3. According to the number of optical fiber cores in the optical cable, the optical cable can be divided into single-core optical cable, double-core optical cable, etc.
4. According to the different configuration methods of the strength members, the optical cable can be divided into the central strength member cable, the scattered strength member cable, the sheath strengthening member cable and the comprehensive outer sheath cable.
5. According to the different transmission conductors and medium conditions, optical cables can be divided into metal-free optical cables, ordinary optical cables, and integrated optical cables (mainly used for railway dedicated network communication lines).
6. According to different laying methods, optical cables can be divided into pipeline optical cables, direct buried optical cables, overhead optical cables and underwater optical cables.
7. According to different structures, optical cables can be divided into flat structure optical cables, stranded optical cables, skeleton optical cables, armored optical cables and high-density user optical cables.
What preparations should be made before laying pipeline optical cables
1. The following preparations should be made before laying the pipeline optical cable
1) Check the position of the pipe hole occupied by the optical cable according to the design;
2) The hole position selected on the same route should not be changed. For example, when changing or turning, it should meet the requirements of the bending radius of the optical cable;
3) The pipe holes used must be cleaned.
2. Each manhole should be manned when laying optical cables manually; manholes at the corners should be manned when laying optical cables mechanically.
3. When the optical cable penetrates the pipe hole or the pipe turns or crosses, a guiding device or a bell mouth protection tube should be used, and the outer sheath of the optical cable should not be damaged. Apply a neutral lubricant around the cable as needed.
4. The length of one-time traction of the optical cable is generally not more than 1000 meters. When it is too long, 8-character segmented traction or middle-assisted traction should be used.
5. After the optical cable is laid, it should be under the unified command of a special person, and the optical cable should be placed on the specified pallet one by one, and an appropriate margin should be left to prevent the optical cable from being too tight.
6.The reserved length of the optical cable in the manhole where the joint is located should meet the requirements in the table; the optical cable reserved for special design requirements is too tight.
