Optical fiberglass or simple optical fiber is a kind of optical conduction tool based on the total reflection principle of light in glass fiber. The tiny fiber is encased in a plastic sheath, so that it could bend without breaking. Generally, the conduction device at one end of the optical fiberglass transmits the light pulse to the optical fiberglass by a light-emitting diode or a laser beam, and the receiving device at the other end of the optical fiber detects the pulse by a photosensitive element. Since the conduction loss of light in optical fibers is much lower than that of electricity wires, optical fiberglass are used for long-distance information transmission. With the decreasing price of optical fiber, optical fiber is also used for medical and entertainment purposes.
The power cable is usually a rope-like cable formed by twisting several or several groups of conductors [at least two of each group]. Each group of conductors is insulated from each other and is often twisted around. The whole cable is covered with a highly insulated cover.The Electric cables refer to materials used for power, communication and related transmission purposes. There is no strict boundary between electric "wire" and electric "cable" Generally speaking, The cables with a small number of cores, small product diameters, and simple structures are called wires, those without insulation are called bare wires, and others are called cables.
The main functions of power cables are transmitting electrical energy, signals and realize electromagnetic conversion, such as power cables and overhead lines to transmit power, coaxial cables to transmit signals, and enameled wires to achieve electromagnetic conversion.
It is mainly composed of optical fiber (glass fiber which is as thin as hair), plastic protective tube and plastic sheath. There is no metal such as gold, silver, copper and aluminum in the optical cable, so it is generally of no recycling value. Optical cable is a kind of communication line and a certain number of optical fibers constitute the cable core in a certain way, which is covered with a sheath and sometimes with an outer sheath in order to realize optical signal transmission.
The function of the optical fiber cable is to convert the electrical signal into an optical signal and transmit it to a long distance through the optical cable. And restore the optical signal to an electrical signal. The advantage of optical fiber cable transmission is that fiber optical cable can be composed of tens of thousands of optical fibers, which can simultaneously transmit tens of thousands of signals without interfering with each other. Light signal transmission speed is fast (speed of light); Long-distance transmission loss of optical signals is small; optical signals are not interfered by electrical and magnetic signals.
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