IP over WDM is considered as a promissing solution for the next generation Internet since it has fewer intermediate layers and can void some functionality redundancy in the intermediate layers like SONET/SDH.

• IP over WDM由于没有中间层,避免了中间层SONET/SDH和ATM层的功能冗余,被认为是下一代因特网最有前途的解决方案。