Optical fiber communication technology (fiber optical communications) from the crowd, has become one of the pillars of modern communication mainly in modern telecommunications, plays an important role. Optical fiber communication as an emerging technology in recent years, the development of fast, application range is communication history of rare, and it is also the important mark of new technology revolution and the information society, the main transmission of information.
Fiber is the abbreviation of optical fiber. Optical fiber communication is a carrier of information, in light of the optical fiber transmission medium as a means of communication. From the theory of optical fiber communication, constitute the basic substance elements are the light source, optical fiber sensors. Besides the manufacturing process, optical fiber material composition and classification of the optical properties, application of optical fiber in the end-use, classification, often can be divided by optical fiber sensor and communication. Optical fiber transmission medium and divided into general and special two, and functional components are used to complete fiber amplifier, the plastic, the light frequency harmonics, modulation, the light and the optical fiber, the function such as oscillations in some functional components and the form. Optical fiber communication is mainly due to the rapid development, it has the following features:
(1) the communication capacity, the transmission distance, An optical potential bandwidth 20THz can reach. Using this bandwidth, just seconds, can be human prodect all text data transfer. Now 400Gbit/s system has been put into commercial use. Optical fiber loss is extremely low, at light wavelengths 1.55 muon m, quartz fiber loss can be below 0.2 dB/km, it is currently any loss of transmission medium is low. Therefore, WuZhongJi transmission distance can reach dozens, hundreds of kilometers even.
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