Abstract: With the increasing scale of mobile phone users and mobile Internet users worldwide, the development of 5G will depend more on the support of optical networks. In this paper, the 5G transport network architecture and the key optoelectronic devices needed are introduced, and the related industrialization progress is described.

Key words: 5G optical transport networks, optical transceiver, low cost, wavelength tunable, reconfigurable optical add-drop multiplexer