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With an IP-based data services, the rapid development of how to meet the growing demand for transmission capacity and bandwidth requirements , is China Unicom's urgent problems . DWDM technology development and the rise of cable in the existing transmission system to achieve greater capacity transmission possible. Dense Wavelength Division Multiplexing DWDM use existing cable resources , so that each fiber to transmit more signals , which greatly improves the communication capacity , reducing the communication construction and operating costs. This paper describes the purpose and significance of research projects , as well as fiber optic communications, wavelength division multiplexing (DWDM) principle, system devices, etc. , described the key technology of DWDM systems , including the light source , optical amplification technology , Forward Error Correction wrong technology, dynamic gain equalization , dispersion compensation techniques. Factors affecting the DWDM system - dispersion, nonlinear effects and fiber loss are discussed. Details on the DWDM transmission network design were introduced , including the overall design, system calculation of the maximum distance relay transmission network management , network protection , the network performance . Combined with China Unicom stone too trunk transmission systems engineering practice, put forward their specific building programs, including the number of wavelengths , the transmission rate , fiber types , optical amplifier settings , dispersion compensation module settings and optical signal to noise ratio calculation. The establishment of a comprehensive and integrated high-capacity, high-speed, high-quality, efficient transmission communication network . DWDM system takes full advantage of existing fiber bandwidth resources, making the next few years without considering the fiber problem, just hang in the above plus SDH equipment can be. Reach DWDM technology in China Unicom stone too trunks full application , as used in the existing cable networks DWDM technology , quickly and efficiently build a high-speed backbone transmission network to provide practical experience.
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