TL;DR

  • Despite TL;DR
    announcements such as a $6 billion manufacturing deal, growing supplier backlogs and extending lead times require operators to secure capacity early while maintaining flexible component specifications.
  • Network redundancy requires verifying physical route independence from outside plant through entrance facilities, as separate carrier contracts often share vulnerable single points of failure like shared ducts or bridges.
  • Passive networks must be designed flexibly with modular distribution and reserved duct capacity to seamlessly support upgrades to 800 Gbps and 1.2 Tbps wavelengths without wholesale replacement.

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Paulo Campos, President, R&M USA Inc.

For U.S. data center developers, the next connectivity challenge extends beyond the server hall. As AI infrastructure expands across campuses and regions, data center interconnect (DCI) is becoming a critical dependency. Computing capacity delivers value only when facilities can exchange data at the required speed, latency and availability. Looking at 2027 and further ahead, operators must secure required connectivity while preparing for technologies and traffic patterns that continue to evolve.

The market signals are compelling. Dell’Oro Group reports that DCI revenue from wavelength-division multiplexing systems and ZR/ZR+ coherent optics grew 45% year over year in the second quarter of 2026. North America generated more than 40% of global optical transport equipment revenue that quarter. “There is strong demand for optical network equipment between neighboring data centers and across long-distance backbones,” says Dell’Oro VP Jimmy Yu.

Bottleneck beyond the building

CBRE’s first-half 2026 research identifies more than 20,000 route miles of new fiber projects announced during the year, linking emerging AI markets with established network hubs. Announced routes, however, are not operational connections. Securing rights-of-way, completing construction, installing cable and commissioning links all take time, according to CBRE.

Power availability also influences where facilities can be built, increasing the importance of connectivity assessments before site commitments. Developers should verify actual route availability, delivery schedules and achievable latency, rather than assuming a nearby fiber corridor provides sufficient capacity or resilience. Redundancy requires similar scrutiny. Two carrier contracts do not guarantee two independent physical paths. Shared ducts, bridges, building entrances or splice locations can expose both services to the same incident. Route diversity must extend from the outside plant through the entrance facility and internal distribution.

Manufacturing commitments need a reality check

Large supply agreements demonstrate the scale of demand. A January 2026 hyperscaler agreement worth up to $6 billion supports expanded U.S. optical cable manufacturing. Another manufacturer broke ground on an $80 million South Carolina expansion in September, with construction scheduled for completion in the first half of 2028. These investments strengthen future supply, but announcements don’t mean confirmed delivery commitments. Nor should every expansion be assigned the same lead time: schedules vary, and construction completion is distinct from qualified production at scale.

Overall, we’re seeing growing optical supplier backlogs and lengthening lead times. The practical response: reserve critical capacity early while retaining flexibility over specifications and release schedules. Procurement should distinguish firm requirements from forecast demand, qualify compatible alternatives and hold targeted restoration spares. Indiscriminate stockpiling risks tying capital to components that no longer suit upcoming – and unpredictable – architecture requirements.

Specify an adaptable physical foundation

DCI encompasses campus, metro and long-haul connections, each with different requirements. Single-mode fiber selection should reflect distance, wavelength plans, attenuation and transmission-system requirements. Cable construction needs to match duct capacity, pulling loads, bend limits and environmental exposure.

At building entrances, high-count cables require manageable splicing and transitions into indoor infrastructure. Ribbon-compatible splice management, protected enclosures, modular optical distribution frames and organized slack storage help accommodate growth. Density matters, but technicians must still reach individual connections without disturbing adjacent live circuits.

Optical performance also requires discipline. We suggest accounting for fiber, connector and splice losses, then retaining engineering margin for repairs and changes. Factory-tested assemblies can simplify repeatable installation; field splicing remains essential where routes and cable lengths demand it. Acceptance testing should verify end-to-end insertion loss, with optical time-domain reflectometer traces documenting splice quality and fault locations.

Flexibility instead of fixed forecasts

Coherent transmission is moving toward 800 Gbps, 1.2 Tbps and higher wavelength capacities. The passive infrastructure should support equipment upgrades without forcing wholesale replacement. Reserve duct space, fiber capacity and distribution-frame expansion positions; use modular termination and splice arrangements with documented interfaces.

Access to a broad, compatible portfolio helps teams adapt cable construction, termination and protection to each location. Combine that breadth with realistic logistics, staged deliveries and installation expertise. Avoid selecting solely on port density, relying on unverified lead times or customizing every connection unnecessarily.

Keep accurate records of fiber assignments, splice locations, test results and physical routes. Reassess these records after each expansion: an apparently minor patching change can undermine planned diversity. Restoration procedures should identify responsible teams, available spares and access arrangements before an outage.

For 2027 and beyond, successful DCI planning will balance three priorities: capacity that arrives on time, physical paths that withstand disruption, and infrastructure that can change as quickly as the business requires.

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