$AAOI - Applied Optoelectronics: The tiny laser company that became the nervous system of AI data centers
A sleepy cable TV supplier for two decades. Then AI happened. From $40 in January, up +325% to ~$170 in under 6 months, and I don't think it's done.
BEFORE WE DIVE IN
The three ways an AI cluster talks to itself and where AOI actually lives
AOI sits inside Layer 7 of the AI buildout, arguably the most argued-about layer in the entire stack. Every GPU cluster on Earth depends on it. Wall Street has built competing trillion-dollar TAM models around it. It’s where the sharpest disagreements in AI infrastructure investing are playing out in real time. AOI is in the middle of that argument, making two components nobody else makes enough of.
Layer 7 isn’t one problem. It’s three different distance problems, each with its own physics and its own winners.
Scale-Up — chip-to-chip, inside the rack. NVLink territory, co-packaged optics. AOI isn’t here.
Scale-Out — rack-to-rack, inside the data center. This is AOI’s turf. The pluggable transceivers that turn electricity into light so GPUs can talk to each other, plus the laser chips that power them. AOI grows those in-house while most of the competition is stuck waiting in line for supply.
Scale-Across — data center to data center, long-haul and submarine. Different game. Not AOI’s lane.
AOI doesn’t just play in interconnect. It owns the one slice of it that’s the actual bottleneck on how fast hyperscalers can get GPUs talking to each other..
Layer 7 is the highest risk/reward layer in the entire AI stack. Technically demanding. Supply-constrained. Three different problems wearing one name. AOI sits right in the middle of Scale-Out, making the two components nobody else makes enough of.
