A U.S. import ban on new Chinese optical transceiv

A U.S. import ban on new Chinese optical transceivers hurts hyperscalers because Western vendors like $Lumentum(LITE.US), $Coherent Corp.(COHR.US) and $Applied Optoelectronics(AAOI.US) can't scale fast enough.

In reality, I do not see how this ban actually materialises, but it’s a fun thought experiment regardless.

Currently, China is the dominant force in optical transceiver supply. According to Counterpoint Research estimates, Chinese manufacturers such as Innolight and Eoptolink account for “nearly two-thirds of global unit supply and approximately 60% of global optical datacom transceiver revenue”.

For context, Innolight is the largest global incumbent and their optical modules account for ~98% of revenue, with the U.S. accounting for 62% of 2026 revenue. In addition, per industry estimates, Innolight holds over half of Nvidia’s high speed module wallet and the bulk of Google's >800G demand this year. They’re pretty important to the U.S.

For more context on the proposed ban, per Reuters: “the U.S. is working on the measure to bar imports of new Chinese optical transceivers”. “New” is the keyword, meaning that everything already certified i.e. the entire shipping 800G base would keep flowing. Then what gets foreclosed is new authorizations. In practice, that means 1.6T qualification, running right now for 2027 clusters.

So the question is whether U.S. firms like Lumentum, Coherent and Applied Optoelectronics can supply the U.S. 1.6T ramp if China is banned from U.S. optical transceiver exports?

I believe the answer is no, which in turn materially impacts the hyperscalers’ ongoing data center buildout.

1. $Applied Optoelectronics(AAOI.US) is scaling from ~100k modules a month in Q1 toward a targeted 650k+ by the end of 2026 ~930k by end-2027 — targets from a company with a record of ramp slips.

2. $Coherent Corp.(COHR.US) only broke ground on its Sherman doubling in June. In turn, that is an ~18 month construction and qualification timeline. Management's own framing is internal InP output doubling by the end of 2026, not module output step changing now.

3. $Fabrinet(FN.US) is effectively the $NVIDIA(NVDA.US) 1.6T line and they bring a new Chonburi building online around year-end worth ~$3bn of revenue capacity. But $Fabrinet(FN.US)'s own datacom number was held back last quarter by laser and component shortages.

U.S. >800G demand is itself growing violently since 1.6T goes from under 1M units in 2025 to many millions in 2026, with an even steeper 2027 inflection. Replacing a >60% Chinese share of a growing market means that non-China output has to roughly 3x in a couple of years. I do not see how that can happen, even with the ongoing capacity expansions at $Applied Optoelectronics(AAOI.US) and $Coherent Corp.(COHR.US).

Ultimately, the binding constraint is lasers. EMLs and CW sources come from $Lumentum(LITE.US), $Coherent Corp.(COHR.US), Mitsubishi, Sumitomo and $Broadcom(AVGO.US) — a layer that is already non-Chinese. And Nvidia's $4bn March lockup of Lumentum and Coherent capacity pushed everyone else's EML lead times past 2027. Banning Chinese modules removes ~zero lasers from the ecosystem. Innolight's real moat is >90% yield at scale on 1.6T SiPh, so a new Western line starting nearer 70% turns the same EML supply into ~25% fewer “good” modules.

Then when you add up 1.6T test set lead times, alignment automation talent, and 6-12 month qualification cycles per hyperscaler platform on top, the short-term window for the U.S. to “replace” China closes up quickly.

Moreover, Western vendors simply won’t over build right now because of CPO potentiality removing pluggables within a generation or two. The rational strategy would be to harvest pricing and let hyperscaler prepayments fund capex — $Applied Optoelectronics(AAOI.US)'s prepaid hyperscaler order structure is exactly that, and I expect more “warrant and capacity” deals as each hyperscaler races to lock in scarce non-China 1.6T allocation first.

Existing certified 800G would keep flowing because the FCC would know that non-Chinese firms can’t fill the gap right now. Which would mean that Chinese 800G stays throughout 2027, and the likes of $Applied Optoelectronics(AAOI.US), $Lumentum(LITE.US) etc. are for the 1.6T U.S. design-ins.

For China, I don’t think they have a big reason to escalate this further right now and front-run an export ban themselves since Innolight would still freely sell to ByteDance, Alibaba and Tencent…China cares about China, the U.S. cares about the U.S.

*If* this Chinese export ban passes, the real fight would however become private: hyperscalers lobbying if the DC buildout stalls and Chinese vendors restructuring toward exemption to profit maximise. That would split the transceiver supply chain into a premium U.S. price curve and a discounted “everywhere-else” curve.