This article introduces design & research application about WDM wavedivision technology in 5G constrction. 5G base stationinterurban high-speed rail and urban rail transitartificial intelligenceindustrial internetGigabit optic network is all important components of the New infrastructure.At present

fiber of transmission link approaches 100%. The next generation of intelligent optical access network architecture will evolve towards 50G PON. All-optical networks are moving towards end-to-end generalized all-optical networks.In the network transfer side

alloptical nodes ROADM expand to the urban area network. The network user side is expanding to the industrial Internet. Therefore

vigorously promote the expanded application of WDM wavedivision technology in the construction of 5G network

strengthen the construction of a 5G network and Gigabit optical network

strengthen cyber security

data security and personal information protection

fully reduce the precipitation rate of optical cable resources

ensure network reliability

flexibility

and maintainability

realize intelligent network operation

enriching the 5G application prospects

is an effective way to develop the 5G Internet industry.