Open Decoupled Data Center Interconnect (DCI) Networks: Architecture, Features, and Future Challenges

In recent years, emerging technologies such as AI, AR/VR, and IoT rely heavily on cloud computing, which connects millions of servers in distributed data centers.

Data Center Interconnect (DCI) technology links geographically dispersed data centers via high‑bandwidth optical networks, with inter‑data‑center bandwidth growing at ~33% annually to around 100 Tb/s.

DCI networks are characterized by simple point‑to‑point topologies, short metro distances, low latency requirements, predominantly 100 G Ethernet services, modular equipment, and special hardware constraints.

The shift from closed, vendor‑specific “black‑box” solutions to an open, decoupled architecture allows customers to mix and match optical (layer‑1) and electrical (layer‑2) equipment, reducing vendor lock‑in and enabling faster adoption of new optical speeds (100 Gb/s → 800 Gb/s).

Alibaba Cloud’s optical network team introduced the concept of open‑decoupled DCI, leveraging standards such as Netconf and OpenConfig, and employing flexible wavelength‑selective switches (WSS) and ROADM‑based mesh architectures to support scalable, multi‑vendor deployments.

Automation tools abstract multi‑layer device models, perform end‑to‑end optimization, and safely adjust configurations while monitoring optical power, amplifier gain, and nonlinear effects, thereby improving operational efficiency.

Looking ahead, the continued growth of 5G, IoT, AR/VR, and edge computing will drive further DCI expansion, and an open ecosystem will foster innovation and meet evolving cloud‑computing demands.