China's recent "limited release" of a key semiconductor material has confirmed that a critical bottleneck for AI infrastructure remains firmly in place.
Let's talk about Indium Phosphide, or InP. It might not be a household name, but it's a crucial compound semiconductor used to make the high-performance lasers and detectors inside optical transceivers. These devices are the backbone of data centers, converting electrical data into light to be sent over fiber optic cables. As AI models become more powerful, they require faster data transmission, making InP-based components for 800G and 1.6T transceivers more vital than ever.
The story of this shortage began in February 2025. That’s when China, a major producer of InP substrates, placed the material under strict export controls. This meant that any company wanting to export InP had to apply for a special license from the government, giving Beijing significant control over the global supply.
Then, in 2026, the AI boom went into full swing. Companies raced to build and upgrade data centers, causing a massive surge in demand for the very optical components that depend on InP. With China tightly controlling exports and demand skyrocketing, a classic supply bottleneck formed, creating significant uncertainty for tech companies worldwide.
In late May 2026, news broke that China had approved a small batch of InP for export. This initially sparked optimism and a brief rally in the stocks of related companies, as investors hoped it signaled a loosening of the controls. However, the relief was short-lived.
It quickly became clear the shipment was just a trickle, not a flood. Most of China's InP output is still being reserved for domestic use, and the licensing process remains restrictive. This event confirmed that China is using its control over InP as a strategic lever in the ongoing tech competition, keeping the global market on a tight leash. For the AI industry, this means the risk of production delays and higher costs will likely persist.
- Indium Phosphide (InP): A semiconductor material used to make high-speed lasers and detectors for fiber optic communication.
- Optical Transceiver: A device that converts electrical signals to light signals (and vice-versa) to send data over fiber optic cables in data centers.
- Export Controls: Government regulations that restrict the sale and shipment of specific goods or technologies to other countries, often for national security or economic reasons.