Industry explainer · U.S. view · Semiconductors · AI networking · Lasers

Optical Modules and Photonics Industry Explained: The U.S. View

AI clusters connect thousands of accelerators, and over anything but the shortest distances those links use light. Optical modules convert electrical signals into light and back, using lasers and photonic chips. The chain has two layers: components such as lasers, made by companies including U.S.-based Lumentum and Coherent, and finished transceivers plugged into switches and servers. Speeds are moving from 800G to 1.6T per module, and newer designs put the optics right next to the switch chip (co-packaged optics, CPO) or switch light directly without converting it (optical circuit switches, OCS). Demand is exploding. Lumentum's revenue more than doubled, up 109% to $1.01 billion in the quarter to June 27, 2026, and it guided $1.225–1.275 billion for the next quarter, citing 1.6T adoption and demand for high-power lasers for CPO. Coherent's revenue rose 34% to $2.05 billion in the quarter to June 30, and its chief executive said AI data centers are increasingly moving from copper to optical connections. The constraint is laser and component capacity, which both companies are racing to expand.

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Lumentum: Revenue up 109% to $1.01B in the quarter to June 27, 2026
Coherent: Revenue up 34% to $2.05B in the quarter to June 30, 2026
Next step: Lumentum cites rising demand for ultra-high-power CPO lasers

IN ONE LINEAI links run on light; lasers are the bottleneck.

How the chain works

Laser and photonic chip makers supply optical engines that are assembled into pluggable transceivers moving from 800G to 1.6T. Newer approaches, co-packaged optics and optical circuit switches (dashed lines), bring light closer to the chips. AI clusters use them to link accelerators.Swipe sideways on a phone to see the full chart.

Pluggable modules, co-packaged optics and optical switches

	Pluggable transceivers	Co-packaged optics	Optical circuit switches
What it is	Module plugged into a switch port	Optics placed next to the switch chip	Switches light without converting it
Stage	Mainstream; 1.6T ramping	Early orders for lasers	Shipments growing
2026 signal	Lumentum: advancing 1.6T adoption	Lumentum: rising demand for ultra-high-power CPO lasers	Lumentum: OCS beginning to layer in
What to watch	1.6T volumes	Switch makers' CPO launches	Hyperscaler adoption

Why AI needs more optics

Each accelerator in an AI cluster has to exchange data with many others. Copper cables work over short distances, but as clusters grow and speeds rise, more links switch to optical fiber. Coherent's chief executive Jim Anderson said in August 2026 that AI data center architectures are increasingly transitioning from copper to optical connectivity.

Faster modules mean more value per link. Lumentum said in its August 2026 results that its cloud module business is advancing the adoption of 1.6T, and switch makers are building 1.6 Tbps platforms: Arista introduced 1.6T AI fabric platforms in its second-quarter 2026 release.

The numbers

Lumentum reported revenue of $1,006.3 million for its fiscal fourth quarter ended June 27, 2026, up 109.3% from $480.7 million a year earlier. Components revenue, including lasers, rose 102.7% to $649.4 million and systems 122.6% to $356.9 million. GAAP gross margin was 47.4%. It guided next-quarter revenue to $1.225–1.275 billion.

Coherent reported revenue of $2.05 billion for its fiscal fourth quarter ended June 30, 2026, up 34% year on year, or 42% on a pro forma basis, with GAAP gross margin of 38.5%. Its finance chief said the company is prioritizing investments to expand manufacturing capacity.

From pluggables to co-packaged optics

Pluggable modules use power to drive signals between the switch chip and the module. Moving optics closer to the chip saves power. Arista says its linear pluggable optics cut interconnect power by about 60% versus traditional pluggables, and Nvidia's Spectrum-6 switches support both pluggable and co-packaged optics.

Co-packaged optics change who captures value: fewer separate modules, but more demand for high-power lasers and photonic components. Lumentum cited increasing demand for ultra-high-power CPO lasers as an early sign of optics moving into in-rack connections.

How the U.S. view differs from the China view

The Chinese version of this page focuses on Chinese module makers, which assemble a large share of the world's high-speed transceivers for U.S. cloud companies, and on their reliance on imported high-end laser chips.

From the U.S. side the strength is in lasers, photonic chips and switch silicon, and in the cloud customers themselves. As optics move toward co-packaging inside switches, more value may shift toward component and chip makers rather than module assemblers.

2026: optics demand doubles

As hyperscalers built larger AI clusters in 2026, optical links multiplied and speeds moved to 1.6T.

Lumentum's quarterly revenue more than doubled year on year, and Coherent's rose 34%. Both pointed to capacity expansion as the priority.

Switch makers began offering co-packaged and linear optics to cut power. The bottleneck shifted toward high-power lasers and component capacity.

What this shows

Bigger AI clusters mean more optical links per accelerator.
Laser and component capacity limits how fast optics can scale.
Co-packaged optics shifts value toward lasers and switch silicon.

Common misreadings

MythCopper will keep handling AI links.

RealityCoherent's CEO says AI data centers are increasingly moving from copper to optics.

MythOptics is a slow-growing telecom business.

RealityLumentum's revenue rose 109% year on year in the quarter to June 2026.

MythCo-packaged optics will kill optical demand.

RealityLumentum cites rising demand for ultra-high-power CPO lasers.

MythPluggable modules are the only option.

RealityNvidia's Spectrum-6 switches support both pluggable and co-packaged optics.

Speeds, architecture and supply: scenarios

Scenario	Main effect	How it passes through
1.6T adoption speeds up	Module value	Higher revenue per link
Co-packaged optics scales	Module makers	Fewer pluggables, more laser demand
Laser capacity falls short	Shipments	Shortages, higher component prices
Tariffs on imported modules	U.S. buyers	Higher costs, shift in assembly location
AI capex slows	Orders	Inventory correction
Optical switching adopted widely	Network design	New demand for OCS and components

Supply and demand by segment

Segment	Supply rigidity	Concentration	New demand	Policy role	What to watch
Lasers and photonic chips	High (fabs, yields)	High	Yes (AI)	Medium	Capacity expansion
Pluggable modules	Medium (assembly)	Medium	Yes	Medium (tariffs)	1.6T volumes
Co-packaged optics	High (new technology)	High	Yes	Low	Switch launches
Optical circuit switches	High	High	Yes	Low	Hyperscaler orders

Supply rigidity: how long new capacity takes and whether money can speed it up. Concentration: whether output sits in a few countries or companies. The more rigid and concentrated, the more prone to shortages.

How to track it

Indicator	What it tells you	Where to find it
Optical component makers' results	Demand and capacity	Lumentum, Coherent quarterly results, free
Switch makers' product launches	Speed and CPO adoption	Arista, Nvidia, Broadcom releases, free
Hyperscaler capex	AI cluster build-out	U.S. view: AI compute
AI networking	Switches the optics plug into	U.S. view: AI networking

Sources

Last updated 2026-10-18.

This page explains the structure and supply-demand logic of an industry for educational purposes. It does not refer to any specific security and is not investment advice. Figures are dated and sourced; they may have changed since, so check the latest official data.