随着ＭＰＬＳ、ＤＷＤＭ、数字包封、波长选路及ＷＤＭ保护环网等新技术的开发，ＷＤ Ｍ光网络层已具有许多原先只能在高层实现的网络功能。原先单纯为了增加系统传输容量的ＷＤＭ技术，已转化为具有真正联网功能的多波长光网络技术，为彻底抛弃ＳＯＮＥＴ／ＳＤＨ，直接在具有光联网功能的 ＷＤＭ多波长光网络上承载 ＩＰ业务创造了条件。 With the development of new technologies such as MPLS, DWDM, digital encapsulation, wavelength routing and WDM protection ring networks, the WD M optical network layer already has many network functions that were previously only implemented at a high level. The original WDM technology originally designed to increase the transmission capacity of the system has been transformed into a multi-wavelength optical network technology with a true networking function. In order to completely abandon SONET / SDH and directly carry IP services on a WDM multi-wavelength optical network with optical networking capability condition.