Brief Analysis Of The Next
The end of 1979 China’s optical communication experiment system in Beijing, Shanghai, Wuhan and other places have trial, after 20 years of rapid development, China has formed the total length of cable over one million kilometers, and high-tech optical communications Technology Research has made great progress. Our trial system was used 850nm wavelength multimode fiber, the transmission rate is low and performance is inadequate. Into our eighties by 1300nm (later changed to 1310nm) wavelength window of single-mode optical fiber communication systems. In the late eighties, China’s optical communications technology into the development of optical fiber, digital communication technology-based communication systems, fiber optic communications network into the nineties technology to China’s rapid development. Advanced SDH system, optical network technology development in China played a major role, China has become the world’s first use of new technology and the SDH system, one of the largest, so that China’s optical fiber communication system to the world’s leading edge optical fiber communication technology.
Been built across the East of China, runs through the north and south of “eight vertical and eight horizontal” fiber-optic backbone communications network lines, broadband communication and information networks of our country’s further development has laid a solid basis. Advanced 1550nm erbium-doped fiber Amplifiers (EDFA) and a dense wavelength division multiplexing (DWDM) and other high technology has been applied to our core network. China’s fiber optic network and related technologies have entered the ranks of the world’s advanced level in the 21st Century is the development direction of optical network fiber-optic grid to further rationalize our country is perfect, is the development of new fiber-optic network in China issues. The world will enter the 21st century, information technology and knowledge-based economy, the development of China’s optical fiber communication network is facing both opportunities and challenges, confident that China has built fiber-optic network based on fiber-optic network construction in China will be towards the intelligent, multi-color broadband direction of development, China’s fiber-optic network construction of China’s economy will play a significant role.
2. Mainstream optical network 2.1. Fiber optic technology Fiber production technology is now mature and is now mass-produced, widely used today is the zero-dispersion wavelength 0 = 1.3 m single-mode optical fiber, while the zero-dispersion wavelength 0 = 1.55 m single-mode optical fiber has been developed, and has entered the practical stage, it is very little attenuation in the 1.55 m wavelength, about 0.22dB/km, it is more suitable for large-capacity long distance transmission is the preferred long-distance backbone transmission medium. The people of the long wave optical fiber research, the transmission distance can reach several thousand kilometers in theory, can be achieved without relay distance, but is still a theory of stages.
2.2. Fiber amplifier
1550nm erbium-doped (Er) fiber amplifier (EDFA), erbium-doped fiber amplifier for digital, analog, and coherent optical communications repeater can transmit a different rate, and can also transmit certain wavelengths of light signals. In the fiber-optic network upgrade from analog signals into digital signals, from low bit rate to high bit rate, the system uses light multiplexing expansion, they all do not have to change the erbium-doped amplifier circuits and equipment. Erbium-doped amplifiers can be used as optical receiver preamplifier, optical transmitter of the post amplifier and the compensation amplifier light source device.
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