The knowledge about optical fiber

It had been found along the light emitted from the barrel of fine wine in the stream; It also found that light along the curved glass rod forward. Why is this? Do not light straight into it? These phenomena attracted the attention of Tyndall, through his research, found that this is the role of total reflection, ie, the water shooting from the air, when the incident angle is greater than a certain angle, the refraction of light disappeared, all the rays are reflected back into the water . On the surface, the light seems to bend forward in the water. In fact, in the bend of the water, the light is still traveling along a straight line, but on the surface have been many, including the total reflection, total reflection of light after several forward spread.

Later, people create a highly transparent, the same thickness as spider silk fiber glass ─ ─ glass, when the light is injected into the right angle to the glass fibers, glass optical fiber along the winding forward. Because of this fiber can be used to transmit light, so called optical fiber.

Optical fiber can be used in communications technology in the. In September 1979, a 3.3 km road cable communication system 120 constructed in Beijing a few years later in Shanghai, Tianjin, Wuhan and other places have also laid a fiber-optic cables, the use of optical fiber communication.

The use of optical fiber for communication is called optical fiber communication. A pair of metal lines at most only way simultaneous transmission of more than a thousand calls, according to theoretical calculations, a pair of optical fiber as fine as spider silk can pass ten billion Tel! Laying 1,000 km of coaxial cable approximately 500 tonnes of copper, use only a few kilograms of quartz optical fiber communication on it. With quartz sand in it, is almost inexhaustible.

In addition, the use of fiber-optic endoscope made ​​of, can help doctors examine the stomach, esophagus, duodenum and other diseases. Fiber-optic endoscopy is composed of thousands of root fiberglass hose, it has light transmission, the ability to transfer images, there are soft, flexible, and can be bent, etc., through the esophagus into the stomach. Fiber-optic image coming out of the stomach, the doctor can get a glimpse of the stomach of the case, then the situation for diagnosis and treatment.