[Introduction] The wavelength division multiplexing technology can make full use of the huge bandwidth resources brought by the low-loss area of single-mode fiber. According to the frequency (or wavelength) of the light wave of each channel, divide the low-loss window of the fiber into several channels, use the light wave as the carrier of the signal, and use a wavelength division multiplexer (multiplexer) at the transmitting end.
The wavelength division multiplexing technology can make full use of the huge bandwidth resources brought by the low-loss region of single-mode fiber. According to the frequency (or wavelength) of the light wave of each channel, the low-loss window of the optical fiber is divided into several channels, the light wave is used as the carrier of the signal, and a wavelength division multiplexer (multiplexer) is used at the transmitting end. The signal optical carriers of the wavelengths are combined and sent into an optical fiber for transmission. At the receiving end, a wavelength division multiplexer (wave splitter) separates these optical carriers carrying different signals at different wavelengths. Since the optical carrier signals of different wavelengths can be regarded as independent of each other (without considering the nonlinearity of the optical fiber), multiplexing and transmission of multiple optical signals can be realized in one optical fiber.
Fiber Access Technology
The optical fiber access network is the “last mile” of the information highway. To achieve high-speed information transmission and meet the needs of the public, not only a broadband backbone transmission network, but also the user access part is the key. Optical fiber access network is the key technology for high-speed information flow into thousands of households. In optical fiber broadband access, due to the different arrival positions of optical fibers, there are different applications such as FTTB, FTTC, FTTCab and FTTH, collectively referred to as FTTx. Therefore, it can make full use of the broadband characteristics of optical fibers, provide users with the required unrestricted bandwidth, and fully meet the needs of broadband access. At present, domestic technology can provide users with FE or GE bandwidth, which is an ideal access method for large and medium-sized enterprise users.
Development of Optical Fiber Communication Technology
In recent years, with the advancement of technology, the reform of the telecommunications management system and the gradual full opening of the telecommunications market, the development of optical fiber communication has once again presented a new situation of vigorous development. The following is a brief introduction to the main development hotspots in the field of optical fiber communication. The description and prospect, the development of ultra-high-speed systems, the evolution to ultra-large-capacity WDM systems.
Judging from the development of optical fiber communication in recent years, building a national backbone optical network that is the most transparent, highly flexible and ultra-large capacity can not only lay a solid physical foundation for the future National Information Infrastructure (NII), but also my country’s information industry in the next century and the take-off of the national economy and national security have extremely important strategic significance. The development of optical fiber communication industry is also an irreversible trend of modern communication.