随着城域传输网的演变和对带宽的需求，密集波分复用技术将由长途骨干网进入城域传输网。
With the evolution of metropolitan transmission network and the bandwidth requirement, DWDM technology will be entered into metropolitan network area from long haul backbone network.
密集波分复用(DWDM)技术在长途通信中已经得到了广泛的应用，但其高昂的系统成本极大地限制了它在城域网中的应用。
DWDM technology has been widely used in long-distance communications, but its high system cost has greatly limited its application into metro area networks (MAN).
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