What is optical fiber? What's the use of it?
Transmission materials for optical communications. Optical communication lines are made of transparent glass fibers, such as hair fibers. It is not the electrical signal but the light signal that is transmitted in the glass fiber. So it is called optical fiber. Long distance communication has the advantages of high efficiency, great capacity and strong anti-interference ability.
One of the wonders of modern science is to transmit light along a wire like current. However, this kind of wire is not a common metal wire, but a special kind of glass fiber. It is called optical fiber, also called optical fiber, or optical fiber.
The ability of fiber to transmit light is very strong, and it can transmit large amounts of information simultaneously with optical fiber communication. For example, an optical cable channel can accommodate one billion people at the same time, can also transmit multiple sets of television programs. The anti-interference performance of the optical fiber is good, the electric radiation is not occurred, the communication quality is high, and the eavesdropping can be prevented. Optical fiber cable is small and fine, not afraid of corrosion, laying is also very convenient, so it is very good communication materials. At present, many countries have used optical fiber cable as long-distance communication trunk. Our country also began to produce optical fiber, and it was put into use in some areas and cities. With the progress of the times and the development of science, optical fiber communication will be greatly popularized.
Optical fibers are made on the basis of this principle. Its basic material is cheap quartz glass, which scientists pull into filaments with a diameter of only a few microns to tens of microns, and then wrap a layer of material with a smaller refractive index. As long as the incident angle satisfies certain conditions, the beam can be twisted from one end to the other in such an optical fiber, without leaking in the middle. Scientists first used this property of optical fibers in optical communications. A light guide fiber can only deliver a very small point of light. If thousands of optical fibers are neatly arranged in a bundle and each optical fiber is in one-to-one correspondence at the ends, it can be made into optical fiber cable. It is incomparable superiority to use optical cable instead of cable communication. For example, the 20 fiber composed of fine fiber like pencils, can call 76 thousand passengers a day, and 1800 copper wires composed like thick cable, every day can only call thousands of passengers. Optical fiber is not only light weight, low cost, easy laying, but also large capacity, anti-interference, stable and reliable, strong confidentiality. The cable is replacing the copper cable, widely used in many fields of communication, television, broadcasting, transportation, military, medical and so on, no wonder people praise for the information age of the nerve fiber. China's own development, production, construction of the world's longest Beijing Han Guang (Beijing, Wuhan, Guangzhou) communication cable, a total length of 3047 kilometers, was opened in October 15, 1993, marking China has entered the era of optical communication applications.
