China holds InP export curbs after Trump-Xi summit
Key insights
- InP export permits now take 60 business days to process, creating a roughly three-month procurement bottleneck per order for AI data centers.
- China's rare-earth exports remain approximately 50% below pre-restriction levels despite the May 2026 Trump-Xi diplomatic summit.
- Not a single approved H200 GPU unit has shipped to Chinese buyers, even where export licenses existed.
Why this matters
InP is the substrate for photonic integrated circuits that carry data between GPU nodes at optical speeds, and any constraint on InP supply directly limits how fast hyperscalers can scale interconnect density in new clusters. The 60-business-day permit delay means procurement planners at companies like Google, Microsoft, and Amazon can no longer treat optical component lead times as manageable, making InP a hard ceiling on buildout schedules for 2026 and beyond. With rare-earth exports also running at half pre-restriction volumes, the compounding materials shortfall signals that China's technology controls now impose multi-layer friction on the entire AI hardware stack, not just compute chips.
Summary
China's export controls on indium phosphide (InP) substrates survived the Trump-Xi summit unchanged, blocking a critical supply path for AI data center optical interconnects.
Permit processing runs roughly 60 business days per application, a three-month dead time per procurement cycle that hits hyperscalers expanding inference capacity. Rare-earth exports remain around 50% below pre-restriction levels, and no approved H200 units have shipped to Chinese buyers despite existing licenses.
Essentially: (Nvidia, major hyperscalers including Google, Microsoft, Amazon) face a calcifying optical supply chain with no diplomatic resolution in sight.
- InP substrates underpin photonic chips in high-speed GPU cluster interconnects and have no near-term material substitutes.
- The 60-business-day permit backlog and the rare-earth shortfall together create a two-layer materials constraint on AI infrastructure expansion.
- The summit produced no concession on InP, indicating China treats the restriction as a durable policy tool rather than temporary leverage.
For builders planning 2026 and 2027 data center capacity, InP availability now joins power and land as a structural input constraint.
Potential risks and opportunities
Risks
- Hyperscalers (Google, Microsoft, Amazon) building 2026 AI clusters could face 3-6 month delays in optical interconnect procurement if InP permit backlogs extend beyond the current 60-business-day window
- Optical component suppliers (Coherent, Lumentum) sourcing InP from China face contract renegotiations or force majeure claims from data center customers if lead times extend further into late 2026
- Nvidia's approved H200 sales to Chinese customers face indefinite limbo, increasing pressure for gray-market or third-country re-export channels that could trigger additional US sanctions enforcement
Opportunities
- Non-Chinese InP substrate producers (AXT Inc., Wafer Technology) and compound semiconductor fabs in Japan and Europe gain leverage to sign long-term capacity contracts with hyperscalers seeking supply diversification
- US and European photonic interconnect startups (Ayar Labs, Lightmatter) could accelerate adoption of alternative architectures that reduce per-unit InP consumption, attracting fresh capital from supply-constrained hyperscalers
- Supply-chain resilience consultancies and critical materials intelligence firms gain new mandates from hyperscalers needing to map and diversify exposure across optical networking supply chains
What we don't know yet
- Whether any major hyperscaler has secured a non-China InP substrate supplier at scale, and at what cost premium relative to Chinese sources
- How long the 60-business-day processing window has been in effect and whether that timeline has lengthened since initial restrictions were first imposed
- What specific diplomatic or trade concessions, if any, China indicated would be required to ease InP permit processing timelines
Originally reported by digitimes.com
Read the original article →Original headline: China Keeps InP Export Controls Unchanged Despite Trump-Xi Summit — Critical Optical Interconnect Material for AI GPU Clusters Still Restricted