网络工程毕业设计外文翻译---什么叫光纤与光纤应用领域(编辑修改稿)

网络工程毕业设计外文翻译---什么叫光纤与光纤应用领域(编辑修改稿)内容摘要：

he optical fiber to allow transmission of electromagic waves on the mode, can be divided into singlemode optical fiber and multimode fiber. Singlemode fiber that can transmit an electromagic wave mode, multimode fiber that can transmit multiple wave modes, in fact, singlemode fiber and multimode optical fiber of the points, that 3 is, the diameter of the core points. Small singlemode fiber, multimode fiber thick. Used in fiber optic cable works are all singlemode fiber, its transmission characteristics, and bandwidth of up to 10GHZ, can be transmitted in an optical fiber 60 PALD TV sets. We have a preliminary understanding of the principles of fiber optic transmission of light, then it is also how a variety of text, images, sound transmission from? It turned out that the use of electronic technology, people can be text, images, sound and other information into electronic signals, making them all into the 1 and 0 digit string consisting of, that is what we often call a digital technology . In digital technology, the 1 and 0, said circuit for opening and closing, the use of the optical technology, the bright and dull that they can achieve two states. So, people through Optical (fiber input to the optical signal device) to issue a series of light and dark fiber different light signal, optical fiber receives the other end of the optical signal, then through the specialized equipment to restore it into a digital signal, Finally, from TV, radio, puters and other digital signal will be reduced to text, images, sounds and so on. Optical fiber munication has a tremendous advantage, first, its capacity is amazing, a thin optical fiber can transmit tens of thousands or even hundreds of millions of road calls, you can transmit thousands of television sets, which is unmatched by other transport means The. Second, the optical transmission of light signals, electromagic interference from outside it, not afraid of humidity, not afraid of erosion, pollutionfree, secure and strong. Optical fiber transmission signal loss is small, only onetenth of the cable. General coaxial cable, at intervals of km is necessary to set up a relay station to pensate for signal attenuation。 and fiber optic munications relay station, the distance can exceed 10 kilometers. In addition, the fiber raw material is that we are familiar with the sand (quartz), and more is on the earth and very ch。