Connecting the Dots, The Complete 16-Fiber Story

By Josh Seawell, director of product management, Sumitomo Electric Lightwave

In this post: the connector landscape for Base-16 networks, pre-terminated solutions that speed revenue generation, hardware designed to protect the investment, and where co-packaged optics and expanded beam optical technology are taking connectivity next.

Synergy Research Group reported in April that the number of hyperscale data centers worldwide reached 1,360 at the end of 2025 – nearly triple the number from 2018 – with almost 800 more in the pipeline and capacity expected to triple again by 2031. The industry is on track to build in six years what took decades to create.

At that pace, getting the connectivity layer right matters more than ever. Here's what I've been telling customers about the complete Base-16 picture, with connectors, assemblies, hardware, and splicing in mind.

The Connector Landscape for Base-16 Networks

The MPO-16 interface is the established standard for 800G-DR8, and it’s a great starting point for greenfield projects deploying Base-16 infrastructure today. In AI-factory environments where every inch of rack space, airflow, and routing is expected to deliver long-term, the MMC connector is the next step. 

MMC connectors, developed by US Conec, achieve 3x the port density of MPO connectors in the same physical footprint. As an MMC manufacturing partner since 2023, Sumitomo Electric Lightwave produces the award-winning PrecisionFlex™ MT and TMT Multi-Row Ferrules behind the industry's first 32-fiber MMC connector.

32-fiber MMC connectors represent a 33% density gain over the already impressive 24-fiber MMC. I must add that the 32-fiber MMC was developed in close concert with hyperscale customers, and our ferrules are available to assembly houses throughout the industry, not just within Sumitomo Electric Lightwave’s own solutions.

Which connector format fits your deployment? That's exactly the kind of question worth bringing to the planning table early on with stakeholders you trust, since the connector-type decision shapes everything downstream.

Pre-Terminated Solutions Speed Revenue

Factory-terminated MPO-16, MMC-16, MMC-24, and MMC-32 assemblies arrive on-site tested and ready to install. It’s that simple. For deployments bridging 12-fiber and 16-fiber environments during a migration, custom assemblies easily span both formats.

Our OEM partnerships with US Conec on MMC connectivity and with 3M on EBO interconnect technology mean the components inside those assemblies carry the validation of the industry's leading connector developers. It’s a true collaborative push to get new facilities up faster with factory-assured performance.

Design Matters: Protecting the Investment 

Of course density matters, but so does the ability to install it well and maintain it over time. Specifying how components work together is how operators can protect their investment and be well-positioned for what comes next.

I could go on and on about how specific thoughtful design features can make installations and maintenance faster and easier, but I'll start with our newest: an AI-optimized rack designed from top to bottom for AI workloads, with vertical separation in raceways, U-turn bends for drop cables, spring-loaded dust covers, and a time-saving installation tool.

I'd also like to highlight our 16-fiber ribbon splicer. Okay, one more: our PrecisionFlex™ pre-terminated patch panels and Hyperscale Exchange Cabinets achieve up to 5,184-fiber interconnects in a single rack unit with MMC connectivity.

Where Do We Go From Here?

Co-packaged optics (CPO) – integrating optical engines directly with switching ASICs – is already in early deployments with broader adoption expected through 2027 and beyond. The fiber bundles in CPO chiplet architectures are divisible by 16, making MPO-16 and MMC the natural front-panel interfaces for CPO-based switches. Base-16 infrastructure built today is robust and ready for what comes next.

Sumitomo Electric is also a founding member of the newly established expanded beam optical multi-source agreement, a multi-vendor initiative to develop open, interoperable specifications for EBO connectivity in AI infrastructure. EBO uses lens-based optical coupling rather than physical fiber contact – addressing debris sensitivity at high connector density. Together with our 3M EBO assembly agreement and our participation in the PRIZM® TMT expanded beam framework alongside US Conec, Corning, and Fujikura, we're contributing to the connectivity standards that will define AI infrastructure for years to come.

Interested in learning more? Read about the shift to Base-16, the fiber and cable technologies behind 16-fiber ribbon cable, and everything installers need to know about splicing 16-fiber ribbons.

For more Next Generation Thinking™, connect with us and follow Sumitomo Electric Lightwave on LinkedIn and YouTube.

About the author: Josh Seawell, director of product management, oversees the development and distribution of Sumitomo Electric Lightwave's optical fiber and connectivity portfolio in North America and CALA.