This paper studies the evolution of 5 G network architecture

the demand for 5 G bearing network

the key technologies and their realization. The technical requirements of the front-haul/middle-haul/back-haul of 5 G bearing on optical devices and optical systems are studied. The selection and evolution of 5 G transmission technology and network construction mode of telecom operators are studied. The evolution of the 5 G bearing network into cloud network convergence is studied.