Abstract: Facing the new infrastructure construction, China Telecom put forward the transformation strategy of “Integration of cloud and network ”, and took the lead in proposing and practicing the concept of “ all-optical network”. Among them, the backbone all-optical network is the first step, the goal is to form an inter-province and intra-province integrated backbone all-optical network covering the whole country, and consolidate the bandwidth cornerstone of the new information infrastructure. Based on the demand analysis, this paper makes an in-depth analysis on the current technology and future development trend of China Telecom backbone all-optical network, including high speed large capacity optical transmission, extended band, new type of optical fiber, all-optical switching technology, etc. Hope to provide reference for related technology research and industrial development work, and jointly promote the development of all-optical network technology.

Key words: all-optical network, backbone all-optical network, WDM, ROADM