Counterpoint states that the FCC's optics ban would impact U.S. hyperscalers.

      China's two largest optical module manufacturers experienced significant losses on Wednesday. Zhongji Innolight dropped by as much as 16%, according to the South China Morning Post, while Bloomberg reported an intraday decline of 14%. Eoptolink Technology also saw a decline.

      The cause of this downturn was a Reuters report indicating that the FCC plans to suspend imports of new optical transceiver models. The goal is to prevent Chinese companies from stealing data or introducing malware into American facilities, narrowing a broader draft ban on Chinese data center devices to a specific component.

      This particular component is not uncommon. Optical transceivers are located at both ends of a fiber link, converting electrical signals into light and vice versa. Every rack in a contemporary AI cluster relies on them.

      A rule targeting China that affects American buyers

      On Wednesday, research firm Counterpoint issued a note warning that the ban would harm the very companies it aims to protect. Analyst Neil Shah stated that hyperscalers like Amazon and Microsoft would incur higher costs if they lost access to Chinese optical suppliers, leading to lower utilization of their costly AI accelerators.

      "The assumption that the optical transceiver market can be neatly divided by geography overlooks how the hardware ecosystem functions," Shah noted in the report shared by Bloomberg. "The global AI ecosystem remains heavily dependent on Chinese optical module vendors for scale execution."

      This dependency is substantial. Counterpoint estimates that Chinese companies supply nearly two-thirds of the global optical transceiver market. Data from LightCounting, referenced by Caixin, shows that Chinese firms occupy seven of the top ten positions in global optical module sales.

      When focusing on the fastest parts, the situation worsens. Innolight and Eoptolink combined hold over 60% of the market for 800G and above modules, according to the same LightCounting data. These are the modules purchased by AI clusters.

      Western suppliers within Chinese modules

      Shah also made a second observation that complicates the security argument. The transceivers produced by Chinese companies are not entirely manufactured in China. They incorporate chips from Broadcom and Marvell, along with lasers and optical chips from Lumentum and Japan's Mitsubishi Electric.

      If the finished modules are cut off, those suppliers would lose a customer. However, market reactions on the day did not reflect this. Applied Optoelectronics, Coherent, and Nokia saw gains, with Caixin reporting increases of 8% to 10% for Coherent, Lumentum, and Marvell.

      Thus, Lumentum and Marvell's stock prices rose due to a regulation that eliminates one of their significant clients. Whether this trend continues depends on how quickly Western manufacturers can absorb the volume. Shah was blunt in his assessment: they cannot do so in the next year or two.

      "While policy measures aim to protect critical AI supply chains, sudden regulatory changes risk creating hardware bottlenecks that could slow deployment schedules for the world's largest cloud operators," he commented.

      Understanding the actual vulnerability of Chinese firms

      The impact is genuinely reciprocal. Innolight reported that 61.7% of its revenue for the first quarter of 2026 comes from the US, approximately 12 billion yuan, according to Caixin. Reuters cited this figure as 62%. Eoptolink generates 96% of its income from exports.

      Both companies recently went public in Hong Kong, with Innolight raising funds through an $8 billion offering and Eoptolink following with a $5 billion listing, both reliant on the same AI optical demand that is now under threat.

      There is an alternative perspective. A separate analysis from Bloomberg suggested that while the ban may strain a fragile trade truce, it is unlikely to significantly impact China's export capabilities overall, as optics is merely one product line in a vast machinery.

      Beijing responded on the same day

      China's Ministry of Commerce announced a series of countermeasures on Wednesday. Exports of drones, their key components, and related technologies to the US will now be subject to case-by-case scrutiny, effective immediately, according to the Associated Press.

      Additionally, the ministry added six US entities to a countermeasures list, including Applied DNA Sciences and the non-governmental group Human Rights in China. It also prohibited a firm named Compliance Testing LLC from doing business in China due to its collaboration with the FCC.

      The ministry initiated a national security review of imported printing software and office equipment. Furthermore, US companies are no longer permitted to conduct follow-up factory inspections for Chinese CCC safety certification, shifting that responsibility to auditors outside the US.

      Beijing characterized these actions as responses to recent American restrictions, which include an FCC ban on drone imports and the addition of 43 Chinese companies to a forced-labor entity list. Last week, the FCC also added foreign-made humanoid robots and power inverters to its covered list, prompting retaliatory actions involving rare earth elements.

      These developments come ahead of an anticipated visit from Xi Jinping to the US in September.

      The transceiver rule