Ask most people what the AI boom looks like and they will describe a chatbot. Ask where the actual money is being spent this month and the answer is stranger and far less visible: fibre-optic cables, lasers and the unglamorous plumbing that moves data between chips. While the press chased the latest model launch, the biggest deal of the season happened in the optical-networking aisle.
The $115 billion deal nobody put on a magazine cover
On 2 November, Marvell agreed to buy Lumentum in an all-stock deal with an enterprise value of about $115 billion (roughly $102.6 billion in equity), a near 24 percent premium on Lumentum’s undisturbed share price. Lumentum makes the lasers and optical components that shuttle data around AI data centres, the part of the build-out nobody photographs. The deal is expected to close in the first half of 2028, which tells you the buyers are planning for AI demand years out, not quarters.
And it is not the only one
The optical land grab has been building all year, mostly below the headlines. TTM Technologies is buying the Ophir Optics business from MKS. TE Connectivity picked up RAM Photonics for its fibre-array know-how. Marvell itself had already bought XConn for around $540 million and added Polariton earlier in the year. Nokia has folded in Infinera’s coherent optical technology and is now eyeing the AI interconnect market directly. There is a pattern: the companies that supply the connective tissue of AI are being hoovered up while everyone argues about which chatbot is cleverest.
Why the bubble-wary should care
If you suspect the model layer is overheated, the picks-and-shovels layer is where the more grounded money has been heading. Optical networking is a real bottleneck with real revenue: every one of those vast data centres needs the fibre and lasers whether or not any given AI company lives up to its valuation. That does not make it bubble-proof, and a sharp slowdown in data-centre construction would hurt here too. But it is a reminder that the AI trade is far wider than the handful of names on the magazine covers, and some of the most consequential deals are the ones you have not heard of.
What this means
Watch the infrastructure layer, not only the models. When the suppliers of the boring, essential components start merging at nine-figure and twelve-figure valuations, it tells you where the smart, patient money thinks the durable demand sits. The chatbots get the headlines. The fibre gets the cheques.
Not investment advice. Sources: Bloomberg; SEC filings; optical M&A overview, November 2026.