城域光网络演进与fgOTN技术的应用

摘要：随着人工智能与产业数字化的深入发展，智算中心互联及高品质企业上云的业务需求日益增长，传统城域光网络在带宽、时延、架构及业务感知能力等方面面临严峻挑战。分析了城域光网络关键技术的发展现状，提出了“极简、扁平、融合”的城域光网络演进架构，阐述了细粒度光传送网（fgOTN）作为小颗粒高品质专线承载及智算业务接入技术在下一代OTN演进中的关键地位，探讨了fgOTN的典型应用场景，并对下一代城域光网络的发展方向进行思考和展望。

关键词：城域光网络；网络架构；fgOTN；应用

Abstract: With the development of artificial intelligence and industrial digitalization, the demand for interconnection among intelligent computing centers and high-quality enterprise cloud access continues to grow. Traditional metro optical networks face severe challenges in bandwidth, latency, architecture, and service awareness capabilities. This paper analyzes the key technology trends in metro optical networks and proposes a "simplified, flattened, and converged" evolution architecture. It elaborates on the important role of fine-grained optical transport network (fgOTN) both as a bearer technology for small-granularity high-quality private lines in the evolution of next-generation OTN and as an access technology for AI computing workloads. The paper also explores the application scenarios of fgOTN and concludes with perspectives on the future development of metro optical networks.

Keywords: metro optical network; network architecture; fgOTN; application