June 17, 2026
By Andrew Degidio, Sr Technical Manager, Sumitomo Electric Lightwave
In this post: what changes technically when splicing 16F vs. 12F ribbon, how to handle mode field diameter mismatches in legacy networks, how AI-assisted splicing is reshaping the learning curve, and why right now may be the best time ever to enter the field.
The fiber optic industry is in the middle of a meaningful transition. As AI infrastructure buildout drives demand for higher-density cable designs, 16-fiber ribbon is rapidly becoming the new field standard – and splice technicians are navigating that shift in real time, whether they're working on greenfield builds or upgrading legacy networks.
Andrew DeGidio is a senior technical manager at Sumitomo Electric Lightwave with more than a decade of technical expertise in the fiber optic industry. A Certified Fiber Optic Technician and Navy veteran, Andrew supports customers and field teams across fusion splicing applications.
Here he answers five questions about what the industry's transition to 16-fiber ribbon means for splice technicians.
1. For experienced fusion splice technicians, what is different about splicing 16-fiber ribbons?
Mass fusion splicing is basically the same at any fiber count: strip, clean, cleave, align, fuse, protect. What changes when it comes to 16-fiber ribbons is that you're managing 16 endfaces simultaneously, which requires more careful preparation.
Any residue from the ribbon matrix left on the fiber after thermal stripping can cause alignment errors across the full ribbon. Cleave quality is more consequential too; the more fibers you're splicing simultaneously, the more chances there are for one imperfect endface to affect the splice or require a reburn.
The biggest culprit in mass fusion splice loss is fiber offset, the lateral misalignment between endfaces at the splice point. At 16F, with higher fiber density across a wider ribbon, offset is more likely – and on a large build with hundreds of splice points, the cumulative effect on link performance adds up. Getting the splice right the first time matters more at scale.
2. What do crews need to know about splicing 16-fiber ribbon in legacy networks?
Many of the new high-density cable designs use optical fibers with smaller coatings than the 250 µm that has been in place for decades. 200 µm and 190 µm coated fibers often have a reduced mode field diameter (MFD) of 8.6 µm, smaller than the 9.2 µm MFD present in legacy networks. When these fiber types meet at a splice point, OTDR equipment can show what looks like a gain or an exaggerated loss. That's a well-documented measurement artifact caused by the difference in how backscattered light behaves across the MFD transition. The splice itself is trustworthy – andSumitomo Electric's research shows that 8.6 µm MFD fiber actually outperforms 9.2 µm MFD fiber in high-density cables under real-world thermal cycling conditions.
My advice in the field is to depend on optical loss test set (OLTS) instead of OTDR readings, especially when there might be an MFD mismatch. TIA-568 designates OLTS measurement as Tier 1 testing, the mandatory pass/fail standard for any installed fiber link. OTDR is Tier 2 – valuable for continuity verification, event location, and troubleshooting, but not the acceptance criterion for splice loss. Test with OLTS, and the MFD artifact is a non-issue; the link passes or fails on actual transmission performance.
3. How has fusion splicing technology evolved to meet the demand for more capacity, faster?
AI-assisted splicing works hand in hand with experienced technicians, giving them a more capable machine for the precision that 16-fiber ribbon demands. For technicians just starting out, the AI assist dramatically reduces their learning curve.
It works by evaluating each endface through the splicer's imaging system before the arc fires. If any surface imperfection or misaligned cleave angle is detected, AI-enabled features automatically adjust arc conditions before proceeding. No stopping for rework! Across 16 simultaneous endfaces, this advancement is the answer to the industry-wide need for more capacity, faster.
Today's mass fusion splicer platforms have also become much more versatile. A single machine can handle multiple fiber counts, coating sizes, and ribbon formats, with interchangeable components that keep crews productive across mixed environments. For operators managing the 12-to-16-fiber transition, that flexibility matters as much as AI capability.
4. Is there specific fusion splicing equipment that can make an installer’s job easier?
The best platforms today can handle anything a field tech might encounter on-site: single fiber through 16-fiber ribbon, 200 µm and 250 µm pitch, tool-free V-groove swapping, and splice-on connectors. For legacy network upgrades where crews are working across both 12F and 16F ribbon, a single splicer that can handle both keeps the work moving. The cleaver matters too: a quality cleaver designed for single fibers and 16-fiber ribbon standardizes the field kit.
Sumitomo Electric’s Quantum-Ultra Ribbon fusion splicer was designed specifically to speed installation of high-performance networks. Bringing together NanoTune™ AI-assisted endface correction across all 16 fibers, this award-winning machine has E-ACAS automatic fiber clamping, manual alignment tappers for direct placement control, a pull-flat mechanism for ribbon in the heater, dual independent ovens, and tool-free replaceable V-grooves for 200 µm and 250 µm pitch.
5. Do you think now is an especially good time to become a splice technician?
There has never been a better time. The demand for skilled technicians is real and growing. Light Brigade’s Sean Kelly said on a recent Fiber Focus podcast episode that one new technician is entering the field for every five who are leaving for management roles or retiring. Todd Jackson at the Fiber Broadband Association has called workforce development “one of the most pressing challenges” facing the industry. That gap is practically a welcome mat.
What makes this moment particularly interesting is that experienced technicians and new entrants are learning how to splice 16-fiber ribbons at roughly the same time. AI-assisted tooling is designed in part to level the playing field and help technicians of varying experience levels produce consistent results.
Tune into the “Why Fiber Optics Is the Best Career” episode of Fiber Focus to learn about Andrew DeGidio’s path from the Navy into telecom. You can also Contact Us for more information or watch a video of the Quantum-Ultra Ribbon splicer in action.
