CPO Capacity Goes 15x, but the Buyers Are the Most Cash-Strapped: NVIDIA Prepays the Back End, and China A-Shares Priced In a 2029 Split | STT Weekly 2026 W43

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Compared with our Sept 28 piece "CPO's real bottleneck isn't packaging yield, it's test" (in Chinese), what is new this time is that NVIDIA itself put numbers on capacity, and locked them in with cash.

First, at GTC Berlin on Oct 21, NVIDIA announced capacity expansions with six supply-chain partners: SPIL's CPO optical-engine capacity reaches 15x today's level by mid-2027 and doubles again by end-2028; KYEC received a $1.1B capacity reservation advance to build a US test site, with high-volume production in April 2027; substrate capacity grows 2.5x over three years, and total test capacity doubles in 2027. Jensen Huang: "Capacity is the constraint."

Second, no mainland China vendor is on the expansion list. On Oct 22, Innolight closed down 8.76%, about 57% below its June high.

Third, the same day Huang said neocloud demand is off the charts, but their funding needs far exceed supply; CoreWeave fell to a 17-month low.

STT's view: what NVIDIA locked up with prepayments is the back end (packaging, substrates and test). 15x is a capacity ceiling, not demand. What the A-share selloff priced in is a split that only happens after CPO ramps in 2029.

▲ Capacity multiples NVIDIA disclosed with six partners on Oct 21: optical-engine packaging 15x to 30x, while test capacity was disclosed only as a doubling. (Image source: Simple Tech Trend original; data from NVIDIA press release and Business Next, Oct 21)

What the Premium Section Covers

• Prepayment breakdown: which segment each of the six partners locks up, and the two links the list leaves out

• Test breakdown: how long a 102.4T CPO switch takes to test, and the gap between 15x and a doubling

• Demand breakdown: CPO is about 2.5M ports in 2027; who buys it and where the money comes from

• Timeline map: capacity arrives in 2027, volume in 2029

• The other side's testimony: one of the "excluded" Chinese vendors is already in the Spectrum-X supply chain

• Taiwan supply chain, link by link: nine positions from TSMC to Hon Precision, and the two real bottlenecks

• 7 counterarguments and 8 signals to watch: including 3 verifiable calls

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That is the summary of this piece.

STT's full analysis (what the prepayments bought, an estimate of CPO switch test time, the funding side of 2027 CPO buyers, and a link-by-link Taiwan supply-chain table) is in the premium section, with 5 original charts.

👉 Subscribe to STT Premium to read the full analysis on vocus (in Chinese): https://vocus.cc/article/6adeadaafd89780001fb175b

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Further Reading on STT

• "CPO's real bottleneck isn't packaging yield, it's test: one PIC takes 100 seconds" (Sept 28, 2026, in Chinese)

• "GTC Berlin 2026 | NVIDIA | Jensen Huang | Building Europe's AI Economy" (Oct 22, 2026)

• "OCP Global Summit 2026 | LightCounting | Vlad Kozlov | Market Forecast for CPO and NPO" (Oct 15, 2026)

This article is for technology and industry trend analysis only and does not constitute investment advice.