Features of optical fiber: 1. Very wide transmission bandwidth and large communication capacity; 2. Small transmission loss and long relay distance, especially suitable for long-distance transmission; 3. Strong anti-lightning and anti-electromagnetic interference capabilities ; 4. Good confidentiality, not easy to be eavesdropped or intercepted; 5. Small size, light weight; 6. Low bit error rate, high transmission reliability.
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
Optical fiber is the abbreviation of optical fiber. It is a fiber made of glass or plastic and can be used as a light transmission tool. The transmission principle is "total reflection of light".
Optical fiber transmits signals in the form of light pulses, using glass or plexiglass as the network transmission medium. It consists of fiber core, cladding and protective sheath. Optical fibers can be divided into single-mode optical fibers and multi-mode optical fibers.
Single-mode optical fiber only provides one optical path and is complex to process, but it has greater communication capacity and longer transmission distance. Multimode fiber uses multiple optical paths to transmit the same signal and controls the transmission speed through the refraction of light.
Optical fibers are generally used for the transmission of communication networks. During the transmission process, different types of optical fibers are selected according to different environments and transmission requirements. The optical fibers used in computer networks include the following categories:
8.3pm core/125pm shell, single-mode optical cable;
62.5um core /125um shell, multi-mode optical cable;
5OPm core/125pm shell, multi-mode optical cable;
loopm core/140pm shell, multi-mode fiber optic cable.
Optical cables are mainly composed of optical fibers (glass filaments as thin as hair) and plastic protective sleeves and plastic outer sheaths. There are no gold, silver, copper, aluminum and other metals in the optical cables, and they are generally not recycled value. Optical cable is a communication line in which a certain number of optical fibers form a cable core in a certain manner and are covered with a sheath, and some are also covered with an outer sheath to realize optical signal transmission. That is: a cable formed from optical fiber (optical transmission carrier) through a certain process. The basic structure of an optical cable is generally composed of cable core, reinforced steel wire, filler and sheath. In addition, there are waterproof layers, buffer layers, insulated metal wires and other components as needed.
The main reason why optical fiber cables develop rapidly is that they have the following characteristics:
The transmission bandwidth is very wide and the communication capacity is large;
Small transmission loss, long relay distance, especially suitable for long-distance transmission;
Strong anti-lightning and anti-electromagnetic interference capabilities;
Good confidentiality, not easy to be eavesdropped or intercepted;
Small size, light weight;
Bit error rate Low, high transmission reliability;
The price is constantly falling.
The basic structure of an optical cable is generally composed of cable core, reinforced steel wire, filler and sheath. In addition, there are waterproof layers, buffer layers, insulated metal wires, etc. as needed. member. Optical cable consists of three parts: reinforced core and cable core, sheath and outer sheath. There are two types of cable core structures: single core type and multi-core type: single core type has two types: solid type and tube bundle type; multi-core type has two types: strip type and unit type. There are two types of outer sheath: metal armored and non-armored.
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