WDM不仅是敷设新光纤的一种替代方式 ,也是未来网络结构及下一代光网络的基础 ,是长期扩容的一种方式。国际数据公司 ( IDC)一份名为 DWDM系统 ,在 1 998年市场回顾和预测的报告指出 :PSTN(公共交换电话网 )对带宽容量的极大需求使光网络正变得越来越重要。DWDM作为减轻新光纤 WDM is not only an alternative way of laying new optical fiber, but also the basis of future network structure and next-generation optical network, which is a way of long-term capacity expansion. An International Data Corporation (IDC) report titled DWDM Systems, Market Review and Forecast, 1998 shows that the tremendous demand for bandwidth capacity on the PSTN (public switched telephone network) is making optical networks more and more important. DWDM as a new fiber to reduce