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China's control of indium phosphide threatens AI data center rollout

Jim Anderson, the CEO of Coherent, a chipmaker backed by Nvidia in an earnings call early in May, warned about a shortage of Indium Phosphide. A U.S. delegation of businessmen accompanied President Donald Trump to China.

Three sources with knowledge of the matter said that Anderson's trip was to highlight the delays in China's licensing for the export of the high-speed optical chip needed in the manufacturing of AI data centres.

According to two U.S. officials and a person who was briefed about the talks, the issue was also raised during the Seoul talks between the top 'trade negotiators' of the two countries in advance of Trump's summit with China President Xi Jinping on May 14-15.

Indium phosphide, or InP as it is commonly known in the industry, has become a powerful weapon that Beijing can use to disrupt the global roll-out of AI data centers.

Konrad Wang is a SemiAnalysis research analyst. He said that InP was one of many supply chain bottlenecks that collectively limit AI data center buildouts.

InP, a material that is essential to the new data center technology, which uses light via optical fibres or photonics instead of electrical signals transmitted through copper wire, is in high-demand.

Nvidia announced in March that it would invest $2 billion each into U.S. companies Coherent, Lumentum and Lumentum Photonics. Custom-chip maker Marvell Technology acquired semiconductor startup Celestial AI to take advantage of its photonics work last year.

Export restrictions by China on InP, which began in February 2025 have become a major obstacle?in the race to design fastest and most energy-efficient components?for AI data centres.

The Chinese commerce ministry has not responded to a request for comments sent by fax.

Beijing's control of InP shows that it is ready to extend its export restrictions on rare earths. These have been disrupting global supply chains for automotive, semiconductors and aviation since last year, as a result of Washington's tariff disputes.

Paul Triolo is a partner with Albright Stonebridge Group.

It is better to slow down or limit the export of upstream materials, such as metals, compounds and substrates. This will allow the optical-module eco-system to scale rapidly enough to meet hyperscaler demands.

According to the U.S. Geological Survey, China will be the top indium producer by 2024. Its production will account for 70% of the global total.

RIPPLE EFFECT

AXT, which is the second largest InP substrate manufacturer in the world and a major Coherent supplier, said that "InP Export Permits represent the greatest challenge we face at the moment."

The company said that its Chinese subsidiary, which manufactures the majority of its InP substrates in China, only received its first permits for export last June, and it has a large backlog of orders.

SemiAnalysis Wang stated that "the restrictions ripple throughout the entire optical supply chains" beyond AXT or Coherent.

He said that despite a quadrupling of production, Lumentum was sold out until 2028, and optical product makers VPEC, LandMark Optoelectronics, as well as Taiwanese VPEC, were experiencing InP substrate disruptions due to AXT permit delay.

Since China introduced export controls on InP, a 6-inch InP Wafer's average price has risen 250% to $5,000.

Sources familiar with the situation say that two of the largest U.S. chip manufacturers have asked for assistance with export licenses due to rising costs and disruptions.

U.S. firms in the photonics industry are also attempting to manufacture their own InP and source them from non-Chinese sources, such as Japan's Sumitomo Electrical Industries. Analysts said that capacity additions were low and slow. It takes about two to three years for new plants to be brought online.

Coherent announced in May that it will double its InP wafer production capacity at its Texas facility this year, and plan to do so again by 2027.

AXT Coherent Lumentum VPEC LandMark and LandMark have not responded to requests for comments. LandMark signed a long term InP supply agreement with Sumitomo in April.

Sumitomo said that the Chinese InP export controls have not had any effect on its production so far.

According to a person familiar with China’s photonic chip sector, Sumitomo consumes most of its InP substratum output internally. This means that the global market is undersupplied.

Market leaders?AXT, Sumitomo and JX Advanced Metals together account for nearly 80% of the global InP substrate production.

CHINESE COMPETITORS

China's export restrictions has created an opportunity for local manufacturers to produce InP substrates. Yunnan Germanium, Guangdong Xiandao, and Zhuhai Dingtai Xinyuan, are the leaders in this field.

Many of these Chinese companies are rapidly increasing production capacity. Yunnan Germanium announced in April a 189-million-yuan investment ($28-million) to increase production capacity to 450,000 InP wafers per year. In its 2025 annual report, the company reported that shipments of InP Wafers increased by 74%.

Guangdong Xiandao launched a new project through its subsidiary Guangdong Xianrui this year. The company expects to produce 40 tons of InP Crystals per annum, which is the raw material required for substrates.

Sources at a Chinese InP manufacturer have confirmed that Yunnan Germanium, Guangdong Xiandao, and other Chinese InP manufacturers are currently in discussions with Chinese officials about export approvals. However, if they are approved, their shipments abroad will likely be limited.

Source: The company is focusing on the domestic market in the short term. There's no evidence that the Chinese government will favour local players over AXT, which wants to export InP from China.

The person added that companies like Coherent and Lumentum - which are primarily supplied by AXT and Sumitomo - would be unlikely to easily switch suppliers, since moving to a different supplier involves lengthy qualification cycles.

No response was received from either Yunnan Germanium or Guangdong Xiandao to faxed comments.

(source: Reuters)