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目前，运营商通常可以采用两种方法来实现传输网络的扩容：要么建设大容量的新网络，要么采用先进的技术从现有的网络中增加更大的容量。新建网络如今面临多方面的困难，主要问题是基础设施的重复建设。当密集波分复用（DWDM）传输平台的容量快被耗尽时，运营商经常发现要进一
At present, operators usually can adopt two kinds of methods to realize the expansion of the transmission network: Either build the large-capacity new network, or adopt the advanced technology to increase the larger capacity from the existing network. The new network is now facing many difficulties, the main problem is the duplication of infrastructure. When dense wavelength division multiplexing (DWDM) transmission platforms are rapidly depleted, operators often find it necessary to enter a