←2026-08-30 · VM Genius
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AXTI doesn’t make GPUs, doesn’t make switch chips, and doesn’t produce 800G or 1.6T optical modules; optical communication chips aren’t even its main business. Yet in this AI optical communications rally, AXTI has been showing up more and more often on investors’ radar.
There’s only one truth: InP, indium phosphide.
More precisely, AXT sells InP wafer substrates. That sounds obscure, but the point actually worth noting is exactly here: while the market is chasing optical modules, silicon photonics, and CPO, InP wafers at the very upstream may be turning from a niche material into the most easily squeezed link in the entire AI optical interconnect expansion chain.
So when money trades AXTI now, what it’s really betting on isn’t “AI,” but:
If 1.6T, silicon photonics, and CPO all ramp together, will upstream InP be enough?
That’s the core.
For the past two years, the core bottleneck in AI infrastructure has been insufficient compute, so the entire market has been scrambling for GPUs. But once GPU counts scale from a few thousand units to tens of thousands—and then past a hundred thousand—the problem starts to change. You can have as many GPUs as you want; if data can’t move between those GPUs fast enough, cluster efficiency still won’t improve.
So AI infrastructure is now gradually shifting from a “compute race” to a “connectivity race.”
Network speeds are also upgrading across the board: 100G → 400G → 800G → 1.6T → and eventually 3.2T. The higher the speed, the more obvious the limitations of traditional copper interconnects become in distance, power consumption, and signal integrity. As a result, more and more data transmission must shift from “electrical” to “optical.” This is why 800G, 1.6T, silicon photonics, and CPO are becoming the new key themes in the AI supply chain. But the market often focuses only on optical modules and overlooks a more upstream question:
Where does the light come from?
One answer is InP lasers. And before you can produce InP lasers, you first need high-quality InP wafers.
AXT sits exactly at this layer.