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Ciena helps cloud providers and telecommunications carriers carry more traffic between data centers and across their networks. These customers buy equipment that transmits data over optical fiber, along with routing and switching products. Optical networking supplies most of Ciena’s revenue; its proprietary WaveLogic technology powers that portfolio.
Customers also pay Ciena to install and maintain networks and for software that controls network operations. Its Blue Planet software automates tasks such as tracking network resources and setting up services. These software and service businesses generate a smaller share of revenue than network equipment.
The business depends on customers’ spending to expand and upgrade their networks, including connectivity for cloud services and AI workloads. Cloud providers buy directly from Ciena and also influence carriers’ network investment through their demand for capacity. Revenue is concentrated among a few large customers, with an unnamed cloud provider and AT&T each supplying a substantial share. Ciena relies on outside manufacturers to build and ship its products, and some optical and electronic components are available from only one or a few suppliers.
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Ciena’s results hinge on cloud providers’ optical-capacity spending—including an unnamed customer that supplied 17.9% of fiscal 2025 revenue—and competition from Huawei as well as the rivals below.
Nokia competes with Ciena for telecom providers’ and cloud customers’ spending on equipment that carries traffic over fiber and routes data. Nokia’s optical-network business is worth watching: it says nine of the ten largest global hyperscalers use its optical networks.
Cisco competes with Ciena for carrier and cloud-operator purchases of routing equipment, optical connections and software that automates network operations. Watch Cisco’s switching and routing products built on Silicon One, which supports its AI-networking offerings.
ADTRAN competes with Ciena to sell carriers equipment that carries traffic across metro fiber networks and connects data centers. Its Optical Networking Solutions revenue is the line to watch for this overlap, rather than its broader broadband-access business.
Ribbon Communications Inc. competes directly with Ciena for carriers’ purchases of data-routing and optical-transport equipment. Watch its push to sell more IP-routing and optical-networking products to existing North American customers.
Marvell competes with Ciena in technology that moves data at high speed through infrastructure networks, selling chips and interconnect products rather than Ciena’s optical systems. Watch its high-speed interconnect and silicon-photonics developments for the competitive pressure on Ciena’s connectivity products.
Lumentum Holdings and Ciena both serve optical-network expansion: customers buy Lumentum’s lasers, wavelength-management products and optical subsystems to build larger solutions, while Ciena sells optical platforms. Lumentum’s optical-networking product demand offers a view of the same capacity-upgrade market, not proof of a supply relationship with Ciena.
Coherent and Ciena both serve rising bandwidth demand from data centers and communications networks: Coherent sells optical transceivers and components, while Ciena sells optical systems and plug-in transceivers. Watch Coherent’s Datacenter & Communications business for demand for the components and modules used in these networks.
Ciena pays Celestica to manufacture products, making Celestica part of its delivery chain; Celestica also designs and builds networking and data-center platforms for cloud customers. Its Connectivity and Cloud Solutions business offers another view of cloud and communications infrastructure spending.
AT&T is a direct source of Ciena revenue, buying products and services across its segments and contributing 10.5% of fiscal 2025 revenue. AT&T sells wireless, wireline and broadband services to consumers and businesses; its fiber and mobile-network investment plans are the news to watch for Ciena demand.
Arista Networks and Ciena serve different parts of cloud and AI network expansion: cloud operators buy Arista’s Ethernet networks and Ciena’s optical connections between and around data centers. Watch Arista’s business with Cloud and AI Titans for a read on this shared spending driver.
Fabrinet’s manufacturing demand and Ciena’s optical-system sales share the network-upgrade cycle: equipment vendors pay Fabrinet to build optical communications products, while network customers buy Ciena’s systems. Watch Fabrinet’s optical-communications manufacturing business rather than treating it as a disclosed Ciena supplier.
Credo competes with Ciena for high-speed connections as cloud operators build AI infrastructure, selling electrical cables, optical transceivers and connectivity chips. Watch its cables and transceivers for hyperscale and emerging AI-cloud data centers, where Ciena is also developing short-reach optical connectivity.
Broadcom competes with Ciena in the technology customers use to expand high-speed network connections, supplying chips, network-interface cards, modules and switches. Its networking-connectivity products are the relevant area to watch, rather than its broader infrastructure-software business.
HPE competes with Ciena for networking-equipment purchases by operators modernizing cloud and communications infrastructure. Watch HPE’s Networking business and its end-to-end networking and security offerings, rather than its server and storage products.
Corning and Ciena serve the same investment in fiber-network capacity: Corning supplies the fiber infrastructure, while Ciena sells the optical equipment that carries traffic over it.
Viavi Solutions Inc. sells network-testing tools to Ciena and to the carriers and cloud operators deploying networks equipped by Ciena. Demand for its high-speed optical and Ethernet testing products offers a view of spending on building and checking those networks.
AT&T Inc. earningsT
AT&T's report will show whether a major Ciena customer is still investing in fiber and mobile networks that use Ciena's products and services.
Look at AT&T's discussion of fiber and mobile-network investment alongside its capital spending. Continued or higher investment means this direct customer is still expanding networks that may use Ciena equipment and services; cuts or delays weaken that demand support, but do not prove AT&T has reduced its Ciena orders. The takeaway is whether this customer's network investment remains a supportive backdrop for Ciena.
Nokia Corporation earningsNOK
Nokia's optical-network results will show whether cloud and telecom customers are expanding purchases in the equipment market where it competes with Ciena.
Read Nokia's optical-network revenue alongside its explanation for the change. Growth tied to cloud and carrier deployments shows real buying in Ciena's market, while also showing Nokia competing for that spending. If revenue falls, check whether Nokia cites weaker customer demand or company-specific lost business or execution problems. That distinction tells readers whether the signal is about the whole market or a change in competition for Ciena.
Celestica, Inc. earningsCLS
Celestica's report will show whether networking-product manufacturing at a company in Ciena's delivery chain is expanding, and whether capacity could affect deliveries.
Look at Celestica's Connectivity and Cloud Solutions business and its comments on manufacturing demand and capacity. Growth with capacity available is a constructive sign for the manufacturing chain, but does not mean Celestica has disclosed Ciena's shipments; capacity constraints could hinder Ciena deliveries. If the business slows, other customers may be responsible, so that alone does not show Ciena orders have fallen. The takeaway is whether the supply chain appears able to support Ciena deliveries, not whether Celestica's revenue stands in for Ciena's results.
Arista Networks earningsANET
Arista's Cloud and AI Titans business will show whether cloud customers are still expanding data-center networks alongside the optical connections Ciena sells.
Watch Arista's Cloud and AI Titans business. Growth says cloud customers are still expanding Ethernet networks, part of the same investment cycle as Ciena's data-center optical connections, but it does not mean Ciena received orders. Flat or falling business makes cloud-network investment a less certain support for Ciena's demand. The takeaway is whether this important group of cloud customers is still building out its networks.
Ciena Corporation earningsThis company
Ciena's report will show whether cloud and carrier spending is turning into optical-platform sales without squeezing the margin on the products that drive most of its revenue.
Read Optical Networking revenue alongside product gross margin. Rising revenue with a steady or higher margin says demand is turning into profitable shipments; weaker revenue or a lower margin points to slower conversion, a less favorable product mix, or higher costs. Together, the figures show whether Ciena is turning demand for its core products into profitable sales or losing ground to those pressures.
