根据 RHK公司的调查分析 ,欧洲的 SDH和WDM市场由 1 999年的 2 6亿美元扩大到 2 0 0 3年的 44亿美元 ,具体的是 2 0 0 0年达到 33亿美元 ,2 0 0 1年达到 38亿美元 ,2 0 0 2年达到 42亿美元。这是由于欧洲内部的各电信公司的竞争及企业和宽带接入用户急需增加带宽的结果。另根据 According to a survey conducted by RHK, the market for SDH and WDM in Europe has expanded from 2.6 billion U.S. dollars in 1999 to 4.4 billion U.S. dollars in 2003, reaching 3.3 billion U.S. dollars in 2000, It reached 3.8 billion U.S. dollars in a year and 4.2 billion U.S. dollars in 2002. This is due to the competition among telecommunications companies within Europe and the urgent need for increased bandwidth for enterprise and broadband access users. According to another