Gary Smith has run Ciena since May 2001, and he spent his first years in the job watching the company's market value fall more than 90% in the telecom bust. In an interview with Steven Rosenbush of The Wall Street Journal last week, Smith said he expects the AI build-out to set its own course and to have a larger impact than the telecom era. Ciena reported numbers that support him on demand. Revenue for the fiscal third quarter ended August 1 reached $1.67 billion, up 37% from a year earlier (Ciena, 2026), and the company expects to close its fiscal year on October 31 with an order backlog above $10 billion (Ciena, 2026).

Ciena sits in the network tier of the AI stack I cover, the layer that carries data between data centers. The carriers and cloud providers who sign contracts at that layer set the pace for every layer above it.

Enterprise network buyers draw from the same supply Ciena is rationing today.

Ciena Has More Orders Than It Can Ship Into 2028

Ciena builds the optical systems and coherent chips that move data across fiber, between data centers and under oceans. The company now makes a 3-nanometer version of its WaveLogic chip that carries 1.6 terabits per second over a single fiber strand, and its engineers are developing a 2-nanometer version, the Journal reported.

Ciena's limit today is how fast it can build and ship. Backlog grew $800 million in the quarter to $8.5 billion (Ciena, 2026). On the September 3 earnings call, management said customers have asked for delivery of most of the expected $10 billion year-end backlog in 2027, and that Ciena does not expect industry supply and demand to balance before fiscal 2028. The company is spending cash in the fourth quarter to lock in multiyear component supply, giving up some near-term cash flow to turn orders into revenue faster.

Ciena gave a preliminary fiscal 2027 outlook of $8.3 billion to $8.4 billion in revenue, at least 30% growth (Ciena, 2026). Smith told the Journal he expects 30% compound annual growth from fiscal 2026 through 2029, and he describes the demand behind it as a series of waves that each add load to the network:

• Cloud providers are connecting multiple data centers to each other today, and that build is still ramping.
• Inference, where businesses put trained models to work on real problems, is starting now.
• AI agents that complete tasks with growing autonomy come next.
• Robotics, which Smith calls physical AI, follows after that.

Smith's Case Rests on Buyers Who Use What They Buy

The 2001 comparison matters to your budget because the telecom boom ended in a fiber glut that collapsed prices for years. About 94% of the fiber laid in that era sat unused, according to Heath Terry of Citi, quoted in the Journal (The Wall Street Journal, 2026). Terry told the Journal that today's GPUs stay in use, which makes the AI build different from the fiber overbuild.

Smith points to the customers as a second difference. In 2001, Ciena depended on Sprint, MCI and Qwest, a concentration he described to The Conference Board in 2014. Each of those carriers has since merged into another company. Ciena's largest buyers now are profitable cloud providers, which Smith told the Journal gives this cycle a sounder customer base. He also calls himself "suitably paranoid" about the parallels. He has reason to be: he told Fierce Network that Ciena's revenue fell from about $1.5 billion to roughly $200 million within four months during the bust.

Two Cloud Providers Now Buy 42% of Ciena's Revenue

Ciena's quarterly filing shows the tradeoff behind the sounder customer base. Two cloud providers, unnamed in the 10-Q, accounted for 41.7% of third-quarter revenue (Ciena, 2026). The larger of the two bought 28.5% of the quarter's revenue, up from 17.9% a year earlier (Ciena, 2026). Revenue from cloud providers that buy from Ciena without a carrier in between grew 82% and reached 53% of quarterly sales (Ciena, 2026).

Ciena's 2026 customers have plenty of money, so the exposure sits in their spending calendars: if the largest buyer revises one data center plan, it can shift more than a quarter of Ciena's quarterly revenue. Ciena told investors its fiscal 2027 outlook assumes cloud providers keep spending at levels consistent with their public commitments. Customers have requested 2027 delivery for most of the backlog, which gives Ciena a cushion if one of them slows down.

"We can't get enough fiber in the ground fast enough."

Gary Smith, Ciena CEO, to Fierce Network

Nokia Reports the Same Supply Squeeze Ciena Does

Ciena shares the optical market with a small group of rivals, and each one competes in a different part of it:

• Nokia bought Infinera in 2025 and is now Ciena's main Western rival in long-distance optical systems. Ciena's strategy chief told SDxCentral that Nokia is a well-resourced competitor that still has work to do combining the two product lines.
• Huawei leads the global market by volume, with about 33% share against roughly 20% for Nokia and 19% for Ciena (Finterra, 2026). Security restrictions keep Huawei out of North America and most of Europe, which opened room for Ciena in those markets.
• Cisco owns Acacia and competes mainly in the small pluggable optical modules that slot into routers and switches. Ciena views Cisco as having stepped back from the larger long-haul systems where Ciena sells most of its gear.
• Broadcom and Marvell compete in short-distance links inside and between nearby data centers, and Ciena says they sometimes work as partners.

Ciena told investors in September it expects to reach about 30% of the combined optical systems and pluggable module market (Ciena, 2026). Nokia has said supply constraints affect parts of the optical market as well, which means a buyer who switches vendors moves to a different line for the same scarce components.

Vendor choice still matters for price and features. It does little for your delivery date in 2027.

Your Network Refresh Shares a Queue With the Hyperscalers

Smith told Fierce Network that hyperscalers have become the biggest owners of submarine cable capacity, a role carriers used to hold. He said many carriers now build wholesale and managed fiber services for cloud providers and newer AI infrastructure companies, and that the industry has underestimated how much capacity AI needs.

My read, and this is inference: when Ciena and its peers allocate scarce systems, buyers holding multiyear orders worth hundreds of millions of dollars get delivery dates first. Your carrier buys from the same suppliers. If you plan a data center interconnect upgrade or a WAN capacity increase for inference traffic in 2027, the lead time on that circuit can depend on where your carrier ranks against a hyperscaler in a vendor's queue.

You can act on this before your next contract renewal:

• Ask your carrier which optical vendor supplies your routes and what lead time it quotes today for new wavelengths delivered in 2027.
• Write firm delivery dates and remedies into capacity contracts for new circuits.

Three Questions Ciena Answers Over the Next Year

• Ciena guided fourth-quarter revenue to $1.70 billion to $1.80 billion (Ciena, 2026). Results, expected in early December, will show whether revenue lands in that range and backlog clears $10 billion.
• Each quarterly filing will show whether a third cloud provider crosses 10% of revenue and spreads Ciena's concentration beyond two buyers.
• Component supply will decide how fast Ciena converts backlog into shipped gear, and how long every buyer in the queue waits.