ULH-DWDM是长途骨干网的载体,提高传输容量和传输距离是其研究的重点。介绍了ULH-DWDM光传输系统,总结了系统的关键技术,如光放大技术、色散补偿技术、非线性抑制、码型调制技术等,并对这些技术及其研究动态作了深入分析和探讨。 ULH-DWDM is a carrier of long-distance backbone network, and improving transmission capacity and transmission distance are the focuses of its research. This paper introduces the ULH-DWDM optical transmission system, summarizes the key technologies of the system, such as optical amplification, dispersion compensation, nonlinear suppression, pattern modulation and so on, and makes an in-depth analysis and discussion of these technologies and their research trends.