Global Data Center Interconnect Market Outlook, 2031

Data center interconnect has moved from a supplementary network layer to the primary demand engine for optical transport equipment, with direct DCI purchases of WDM equipment surging nearly 40 percent in 2025 against a 10 percent expansion in the broader optical transport market to 16 billion dollars, according to Dell'Oro Group. Coherent pluggable optics have become the defining technology transition of the category, with 400ZR/ZR+ modules accounting for almost half of all telecom bandwidth deployed in 2025 and 800G pluggable shipments positioned as the highest-growth coherent interface segment for 2026. Hyperscaler capital reallocation toward AI infrastructure has reshaped demand composition, with cloud service provider optical transport spending growing 58 percent year over year in the third quarter of 2025 and the DWDM long-haul segment expanding 24 percent as AI training clusters required low-latency interconnects across distributed data center campuses. The supply chain has become the binding constraint rather than demand, a laser and indium phosphide component bottleneck that has elevated DCI optics from a procurement line item to a board-level supply risk. Government digital infrastructure policy is channeling capital into DCI-adjacent capacity, with Brazil's data center sector attracting 159 billion reais in investment commitments and 38 GW of grid access requests as of mid-2026, and the proposed Redata special regime suspending equipment import taxes conditioned on research, sustainability, and technology transfer commitments. Japan's Ministry of Internal Affairs and Communications and Ministry of Economy, Trade and Industry launched the Watt-Bit Public-Private Council in March 2025 to integrate power and communication infrastructure planning, including All-Photonic Network testbeds connecting distributed data centers, a policy framework that directly shapes DCI transport requirements for the AI era.

The DCI vendor hierarchy is more concentrated than the broader optical transport market, with Ciena, Nokia, and Cisco constituting the top three DCI suppliers by revenue share in 2025, while Huawei, Ciena, Nokia, ZTE, and Cisco ranked as the top five optical transport vendors overall, reflecting the high concentration of DCI revenue in North America. Ciena retains the deepest DCI franchise, with its share of the long-haul DCI market reported at approximately 63 percent and roughly half of group revenue derived from cloud customers, a customer mix that positions it as the primary beneficiary of hyperscaler interconnect spending. Nokia's February 2025 acquisition of Infinera reshaped the competitive field, lifting Nokia to approximately 20 percent global optical networking share and adding more than one percentage point of market share alongside Ciena in the first nine months of 2025, while also securing scarce idle manufacturing capacity that analysts expect to translate into share gains in 2026. Cisco and Marvell dominate the pluggable coherent module layer, holding leading positions in 400ZR/ZR+ and 800ZR/ZR+ modules since 2022, and Cisco's Acacia 600G offering has begun opening share migration away from Ciena's embedded DCI platforms toward pluggable-based IPoDWDM architectures. Entry barriers have shifted from optical line system engineering to coherent DSP and laser component access, with vertical integration into indium phosphide fabs becoming a decisive advantage as McKinsey documents OEMs buying or partnering with laser fabs to secure supply, and China-based suppliers increasing their share of the back-end pluggable market by roughly 20 percentage points between 2017 and 2023 to about 60 percent. Pricing and transaction economics favor pluggable-based IPoDWDM architectures over chassis-based transponders because ZR/ZR+ optics plug directly into routers, eliminating dedicated optical transport shelves and reducing capital and operational expenditure for metro and regional DCI spans, a shift that is compressing the addressable market for traditional muxponder platforms.

Market Dynamics Driver: AI cluster scale-across forcing DCI bandwidth expansion at unprecedented rates
• Distributed AI training and inference require low-latency interconnects between data center clusters that cannot be co-located within a single campus, and McKinsey forecasts hyperscalers shifting approximately 87 percent of back-end optics to 800 Gbps and greater by 2029, with 1.6 Tbps transceivers accounting for more than 40 percent of that demand.
• The bandwidth trajectory is steepening rather than linear, with datacenter bandwidth projected to grow tenfold over five years and the DCI transceiver market expanding toward 4 billion dollars by 2030, while 400G and 800G ZR/ZR+ modules ramp and 1.6T ZR/ZR+ enters development.
• Datacom optical component revenue exceeded 19 billion dollars in 2025, a more than 70 percent increase over 2024, and over 42 million high-speed 400G+ modules shipped in the year, driven by hyperscaler AI investment that revised capex forecasts higher through the fourth quarter of 2025.

Challenge: Coherent optics supply shortfall and geopolitical supply-chain fragmentation
• The laser and optical component supply chain cannot match demand growth, with 800 Gbps transceiver production projected to run 40 to 60 percent below demand until 2027 and 1.6 Tbps shortfalls of 30 to 40 percent likely through 2029, creating a bottleneck that could throttle AI-era network deployment independently of GPU availability.
• Supply-chain concentration and geopolitical tension are compounding the shortfall, with China-based suppliers holding roughly 60 percent of the back-end pluggable market and assembly migrating to Southeast Asia and Europe in response to tariffs, while export controls and domestic-content requirements fragment procurement across regions.
• Power and cooling capacity limits at data center campuses are emerging as a parallel constraint, with Brazil alone receiving 38 GW of grid access requests against 7.1 GW of committed capacity, illustrating how DCI demand is being shaped not only by optics availability but by the physical infrastructure required to energize interconnected facilities.

Trend: Pluggable IPoDWDM and co-packaged optics collapsing the optical transport hierarchy
• The architecture of DCI is migrating from dedicated optical transport shelves toward pluggable coherent transceivers inserted directly into routers and switches, with IPoDWDM systems projected to grow nearly 40 percent in 2025 and ZR+ module shipments increasing significantly in 2026 to support hyperscale expansion.
• Co-packaged optics is moving from research into early deployment, with 1.6T transceivers in production and 3.2T and 6.4T devices in development, and ELSFP orders signaling an upcoming wave of CPO deployments that will further integrate optics into switch packages and reduce the standalone transponder addressable market.
• Metro and regional DCI is becoming the fastest-growing connectivity segment because AI inference requires data to be processed closer to users, and approximately half of the metro segment currently uses 400 Gbps ZR/ZR+ transceivers, with 800G ZR/ZR+ expected to capture about 70 percent of market share by 2029.



Segment Analysis By Equipment Type
• Optical transport platforms remain the revenue backbone of DCI despite the pluggable migration, with the products segment accounting for 52.4 percent of the total DCI market in 2025 at 8.05 billion dollars, and Dell'Oro tracking DWDM long-haul growth of 24 percent year over year as AI back-end networks required regenerated spans beyond pluggable reach.
• Coherent pluggables are the fastest-growing equipment category because they eliminate dedicated transport shelves and plug directly into routers, with 400ZR/ZR+ modules accounting for almost half of deployed telecom bandwidth in 2025, 800G pluggables positioned as the highest-growth coherent interface in 2026, and Cisco and Marvell dominating the module layer.
• ROADM and optical cross-connect demand is being reshaped by AI-driven mesh topologies that require dynamic wavelength reconfiguration between multiple data center sites, and the segment benefits from hyperscaler adoption of disaggregated WDM architectures that decouple terminal functions from line systems.
• Router-integrated DCI is gaining share as IPoDWDM collapses the boundary between packet and optical layers, and the segment's growth is tied to hyperscaler router refresh cycles where coherent pluggables are inserted directly into line cards, reducing the need for standalone optical transponders.
• Line systems and amplifiers remain essential for long-haul DCI spans beyond pluggable reach, and the segment is benefiting from the DWDM long-haul expansion of 24 percent year over year as AI back-end networks connect campuses separated by hundreds of kilometers.
• Software-defined networking controllers, optical time-domain reflectometers, and fiber monitoring systems constitute the auxiliary equipment layer, and the software segment is projected to grow at 15.8 percent annually through 2030 as operators seek automated provisioning and fault management across multi-vendor DCI fabrics.

By Connectivity Type
• Metro and short-haul DCI is the fastest-growing connectivity segment because AI inference and content delivery require data processing closer to end users, and approximately half of the metro segment currently uses 400 Gbps ZR/ZR+ transceivers, with pluggable IPoDWDM architectures reducing the cost per bit for spans up to roughly 80 kilometers.
• Long-haul DCI remains the highest-value connectivity segment and the primary driver of optical transport equipment revenue, with Ciena holding approximately 63 percent of the long-haul DCI market and DWDM long-haul growing 24 percent year over year as hyperscalers connect distant AI campuses and renewable-powered data center clusters.

By Application
• Disaster recovery was the largest application segment in 2025 at 36.4 percent of the DCI market, because enterprises and cloud providers maintain geographically separated mirrored facilities that require continuous synchronous and asynchronous replication across dedicated optical links.
• Storage mobility demand is driven by the need to migrate petabytes of training data and model checkpoints between data centers, and the segment is growing as AI workflows require data to move between compute clusters and storage repositories without saturating public internet capacity.
• Workload mobility requires low-latency, high-bandwidth links that allow virtual machines and containers to migrate between sites without service disruption, and the segment is expanding as enterprises adopt hybrid cloud architectures that distribute applications across on-premises and colocation facilities.
• Shared resource clustering is projected to be the fastest-growing application at 14.6 percent compound annual rate through 2030 because AI training and HPC workloads require tightly coupled clusters of GPUs distributed across multiple data centers, driving demand for deterministic, ultra-low-latency DCI fabrics.
• AI and HPC interconnect has emerged as the most strategically important application because training trillion-parameter models requires scale-across architectures that treat multiple data centers as a single compute fabric, and the segment is pulling 800G and 1.6T coherent optics into production ahead of general enterprise adoption.
• Content distribution, financial trading, and government research networks constitute the remaining demand, with national research and education networks procuring DCI capacity for scientific data transfer and sovereign AI initiatives requiring domestic interconnect between publicly funded compute facilities.

Regional Analysis
• North America was the largest DCI region and the region concentrates the highest-value hyperscaler and cloud service provider demand, with cloud service provider optical transport spending growing 58 percent year over year and Ciena, Nokia, and Cisco deriving a high concentration of DCI revenue from North American customers.
• Europe's DCI demand is shaped by the European Commission's IPCEI Next Generation Cloud Infrastructure and Services programme, which approved up to 1.2 billion euros in state aid across seven member states for cloud and edge infrastructure development, and the region's procurement is oriented toward sovereign cloud interconnect and data residency-compliant optical fabrics rather than hyperscale AI scale-across.
• Asia-Pacific was the second-largest DCI region after North America, supported by hyperscale construction in China, Japan, and India, and the region's demand is being shaped by Japan's Watt-Bit Council integrating power and All-Photonic Network infrastructure for distributed data centers and India's TRAI recommendations on data centre, CDN, and interconnect exchange regulation issued in November 2025.
• South America's DCI demand is anchored by Brazil, where the data center sector has attracted 159 billion reais in investment commitments and 38 GW of grid access requests, and Microsoft announced a 2.7 billion dollar investment in Brazilian cloud and AI infrastructure, while the proposed Redata regime would suspend equipment import taxes to accelerate optical transport deployment.
• The region's DCI trajectory is defined by sovereign AI capital, with Saudi Arabia's Public Investment Fund-owned HUMAIN targeting 6.6 GW of data center capacity over the next decade and forming a joint venture with stc's center3 for up to 1 GW of AI workloads, creating first-time demand for high-capacity DCI links between distributed AI campuses and renewable-powered generation sites.

Considered in this report
• Historic Year: 2020
• Base year: 2025
• Estimated year: 2026
• Forecast year: 2031

Aspects covered in this report
• Data Center Interconnect (DCI) Equipment Market with its value and forecast along with its segments
• Various drivers and challenges
• On-going trends and developments
• Top profiled companies
• Strategic recommendation

By Equipment Type
• Optical Transport Equipment
• Coherent Optical Transceivers and Pluggable Optics
• Optical Switching and Multiplexing Equipment
• Packet-Switching Equipment (Routers and Ethernet Switches)
• Optical Amplifiers and Line Systems
• Other DCI Equipment
By Connectivity Type
• Short-Haul Interconnect
• Long-Haul Interconnect

By Application
• Disaster Recovery and Business Continuity
• Data and Storage Mobility
• Workload and Virtual Machine Mobility
• Shared Data and Resource Clustering
• AI and High-Performance Computing Interconnect
• Other Applications