In the network transmission, fiber optic fiber is undoubtedly one of the high expectations transmission equipment. As the most popular transmission line at present, fiber has a farther transmission distance than twisted pair line, which is more stable and cheaper than coaxial cable. In addition, the almost unlimited bandwidth capacity of the optical fiber satisfies all the needs of the people. Therefore, no matter the ordinary network transmission, or the submarine optical cable, even the decorative application, the shadow of the fiber can not be reduced.
Of course, if we want to be an expert, we know that the advantage of optical fiber is only a small part of experts, and that we can make a clear identification of optical fiber. So, teach you how to identify and choose fiber, and let you be a man in front of people.
Look at the fiber from the core number
For fiber, it can be divided into four kinds according to the difference of core number - central bundle tube type, layer stranded type, skeleton type and band type four kinds. Different uses have different structures, so people need to be clear and clear about their uses before they choose. First of all, let's look at the central bundle. The central bundle can be said to be the lowest cost of a few kinds of fiber. Therefore, it has a very obvious advantage in protecting the better transmission lines.
Compared with the central beam tube type, the "brittle" layer twisted fiber has stronger toughness. It adopts the way of adding steel strand or steel wire in the middle, so it has the characteristics of waterproof, pulling force, or being able to adapt to the strong pressure measurement. So it can be buried directly in the ground without special protection. At the same time, the whole cable is not completely cut off because of its branch building, and the cable is only needed to be split into the cable. Therefore, it also provides more convenient construction and maintenance conditions for the data communication network.
In these types of optical cables, the largest inner core capacity is the ribbon optical cable. Because it is the use of the 4-12 core fiber are arranged in rows, and then the unit, unit arrangement, so it can be the number of core ribbon fiber plus thousands of cores, which greatly expanded the line bandwidth, thus the current network cables are mostly made of tube and continuous layer.
Select configuration according to use
If they are divided according to their usage, they will be completely different from those above. They are aerial optical cable, directly buried optical cable, pipeline optical fiber cable, submarine optical fiber cable and metal free optical cable. And their optical fiber features are very different. For example, the overhead optical fiber cable has high strength, and the temperature difference coefficient is small. The direct buried type has no strong protection due to direct touchdown, so it needs strong compression and moisture proof and moisture proof capabilities, and also has strong corrosion resistance. For pipelines and submarine optical cables, because they are in the bottom of the high pressure environment, the most important thing is the anti water pressure and tension resistance of the cable.
The last category is metal free optical fiber cable, which can be used by high voltage wire frame, so the demand for external force is the least, so it will be more convenient in construction. However, although this kind of cable has no iron core in the core, it has the same requirement for the ability of compression.
The influence of different tectonic media on the line
For the life of fiber, it is closely related to the structure medium of the line. At present, the main materials for fiber are fiber core, fiber ointment, PBT and sheath materials and so on. First of all, the core and core can guarantee high signal-to-noise ratio, low bit error rate and long distance amplifier spacing in transmission. Therefore, it is a good choice to ensure transmission quality. The fiber ointment acts as a drying agent and liner, which ensures that the line is protected from wet corrosion and prevents the impact of the vibration on the line.
For the application of underwater optical fiber, the PBT material with strong anti hydrolysis ability must be used. Because the underwater fiber faces under water pressure and deep corrosion threat, PBT can make the fiber bundle tube with pressure and temperature adaptability is very good, so it can guarantee the service life of the equipment is not reduced in duration under high pressure. The sheath material plays an important role in the long-term reliability of optical cable. It determines the tensile, bending, temperature and natural aging properties of optical cable, and is also the key to the fatigue resistance of optical fiber.