What is Fiber optic cable




Cabelte produced the first (multimode) optical cable in Portugal in 1983, which was supplied to the Institute for the Development of Communications (IDC) through an experimental connection between Inesc and IDC at the Instituto Superior Técnico.


The first cable produced for commercialization is called "light guide cable", which directly translates the characteristics of the optical fiber of an optical waveguide, it is composed of 50/125 multimode optical fibers of compact structure and consists of 4 to 6 optical fibers. The client is the old CTT / TLP.


Managed Fiber services


Cabelte's fiber optic cable production increased significantly in the early 1990s when dedicated fiber optic cable ships were built and "loose" technology was introduced.


Since then, due to the nature of fiber optics itself, especially the low attenuation associated with the near infinite bandwidth (single-mode fiber optics), fiber optics is increasingly recognized as one of the leading channels in the world of the comunications. There has been an evolution in optical transmission systems.


Today, fiber optic cables are part of all communication backbones in regional and metropolitan networks. The emergence of high-bandwidth "triple pay" services, interactive games, high-definition television, telemedicine, etc. in the access network, it will gradually replace copper by fiber optics for subscribers.


General characteristics

Fiber optic cables usually consist of a central core where the fibers are grouped and several layers of protection. The design and dimensions of fiber optic cables are primarily intended to separate the fiber from mechanical stresses and environmental conditions that the cable can be affected during installation as well as during its useful life.


The optical fiber, which consists of a set, core and sheath responsible for programming the optical signal, is covered with a double layer called the primary coating, which allows the fiber to be processed avoiding the risk of contamination. Once configured, it is separated by a secondary coating that can become hard again, in this case it can be designated as "tight" or "tight" or it can be loose, in which case it can accommodate more than one fiber. In the same liner / pipe. Most of the cables in the Cabelte family are of "loose" technology and each tube can contain from 1 to 16 fibers. The tubes can be wired in concentric layers to produce cables of various configurations and a large number of fibers, which can number in the hundreds.

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