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作为电信网基础设施的光传输网近年来得到了长足的发展,一般来讲光传输系统可以分为“以电信号处理为主”的系统和以“以光信号处理为主”的系统。目前,比较成熟的光传输技术主要是“以电信号处理为主”的SDH和S-DXC系统,代表电时分复用制式,同时还有“以光信号处理为主”的密集波分复用系统,代表着波分(频分)复用制式。受网络业务的驱使,SDH继续朝高比特
In recent years, the optical transmission network as the telecommunication network infrastructure has made considerable progress. Generally speaking, the optical transmission system can be divided into a system mainly based on electrical signal processing and a system based on optical signal processing. At present, the more mature optical transmission technology is mainly “SDH and S-DXC systems based on electrical signal processing”, representing the electrical time division multiplex system, and also the “wavelength division multiplexed optical signal processing-based” System, on behalf of the WDM (Frequency Division Multiplexing). Driven by the network business, SDH continues towards high bit