A Traffic Jam, of Sorts……
AI chips are getting very good at crunching data.
Moving it around is another matter.
As thousands of increasingly powerful chips get packed into data centers, the connections between them have to keep up. Bernstein calls the growing mismatch the “bandwidth wall.”
And Wall Street thinks it could be very good news for a less glamorous corner of the AI boom: optical networking.
Coherent, Lumentum and Ciena all jumped roughly 7%–11% after Bernstein singled out networking companies as potential “structural winners.”
A nice day.
Though hardly the beginning of the story.
The businesses behind these stocks have been growing quickly, and investors have been paying attention. Some of the names Bernstein just highlighted were already up 60%, 70%, even 180%+ this year.
Bernstein may have found the traffic jam.
But investors appear to have found the detour a little earlier.
Let’s dig into it. ⇩
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20/20 Vision…
Bernstein launched coverage across a broad group of U.S. networking names, looking at the companies responsible for moving data through increasingly large AI systems.
And it came away particularly bullish on several of them.
→ Ciena $CIEN ( ▲ 3.22% ) : Outperform, $440 target
→ Coherent $COHR ( ▲ 5.59% ) : Outperform, $350 target
→ Lumentum $LITE ( ▲ 3.79% ) : Outperform, $1,220 target
→ Arista Networks $ANET ( ▲ 1.4% ) : Outperform
Cisco and Corning received Market Perform ratings.
The dividing line comes back to that bandwidth problem.
As AI clusters get larger, more data has to travel between chips, racks and data centers — making the networking layer increasingly important alongside the compute itself.
Bernstein’s view is that companies supplying that infrastructure could become
✱ “structural winners” as the AI buildout continues.
Wall Street clearly liked the argument.
Three of the optical names promptly jumped 7%–11%.↓
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The Traffic Is Real…
Bernstein isn’t working with a purely theoretical traffic jam.
Demand is already showing up in the numbers.
Across three of the optical names, the latest quarterly revenue growth looks like this:
→ Lumentum: +109% YoY
→ Ciena: +37% YoY
→ Coherent: +34% YoY
Lumentum is the standout.
Its latest quarterly revenue more than doubled to $1.01 billion, while adjusted gross margin reached 50.4%.
And management expects another step up next quarter:
$1.225B—$1.275B in revenue.
Ciena is seeing its own acceleration.
Revenue climbed to $1.67 billion, with optical networking accounting for $1.19 billion — more than 70% of the business.
Coherent, meanwhile, reached $2.05 billion in quarterly revenue as management pointed to accelerating demand from AI data-center customers.
Three different companies.
Three very different growth rates.
One increasingly familiar customer need: moving a lot more data.
And the technology being built to handle that traffic is changing too.
✱ Copper is starting to make more room for light.↓
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Let There Be Light…
Inside a data center, information traditionally travels over electrical connections such as copper.
That works well — until the amount of data, distance and power required to move it start climbing.
AI is pushing all three.
Optical connections take a different approach: they move data using light.
That allows enormous amounts of information to travel quickly while becoming increasingly useful as AI clusters grow larger and more demanding.
Coherent is already building around that shift.
The company recently launched PhotonLink, a new platform designed to bring optical connections closer to the chips doing the computing.
And customers are already kicking the tires:
→ 10+ co-packaged optics engagements
→ 10+ near-packaged optics engagements
→ 5+ chip-to-chip engagements
Co-packaged optics, or CPO, essentially puts the optical connection right next to the networking chip — shortening the distance electrical signals have to travel before the data gets converted to light.
Coherent expects PhotonLink revenue to begin ramping in Q4 2026.
So the bandwidth wall isn’t only producing bigger revenue numbers.
It’s changing how the plumbing underneath AI gets built.
And investors haven’t exactly waited for the construction to finish. ↓
A Little Late To The Party…
Bernstein may have given optical stocks a fresh push.
It certainly didn’t start the rally.
Before the latest call, several of these names had already put together rather extraordinary years:
→ Lumentum: +183% YTD
→ Coherent: +73%
→ Ciena: +62%
→ Arista Networks: +56%
Lumentum is the obvious outlier.
A stock up nearly 3x in nine months is already carrying considerably more enthusiasm than it started the year with.
Lumentum’s revenue more than doubled. Ciena raised its full-year outlook. Coherent is rolling out new optical products as AI customers demand faster connections.
The businesses have been accelerating.
And Bernstein’s “structural winner” thesis may help explain why investors are excited.
The harder question is how much of that excitement is already reflected in the price.
The Second Question…
There are really two questions when a new investment theme starts taking shape.
1 First: Is the trend real?
AI systems are getting larger. Moving data between all those chips is becoming more demanding. Revenue at several of the companies supplying that infrastructure is climbing quickly.
2 Then comes the second question: How much of that story is already in the stock?
That one gets harder after Lumentum rises 183%, Coherent 73%, Ciena 62% and Arista 56% in less than a year.
A powerful trend can keep getting more powerful.
But every dollar a stock rises also changes what investors are paying for the opportunity — and how much future growth the company eventually has to deliver.
Bernstein’s “structural winners” argument may prove right.
✱ The stocks have simply made the hurdle a lot higher.
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