Lumentum makes the tiny lasers that turn data into light, so AI chips can talk to each other across a data centre.
Those lasers have to be grown on a fragile crystal that only a few factories in the world can work at volume, and demand is running well ahead of supply.
That is why Nvidia, a chip company, paid $2 billion to make sure Lumentum builds more of them.
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Nvidia paid Lumentum $2 billion for lasers, because silicon cannot make light