After the $725B Capex Lock-In, the Optical Race Has Moved to the Supply Side — 2026 Industry Weekly Review (07/27–08/03)

This week (07/27–08/03) was the core closing week of Q2 earnings season. Microsoft, Meta, Amazon and Apple all reported on 7/29–7/30, pushing the Big Four clouds' combined 2026 capex to roughly $725 billion, up 77% YoY. Add Alphabet's earlier raise to $195–205 billion with Cloud up 82% YoY, and four earnings reports together nailed down that "AI infrastructure isn't slowing — it's accelerating."

But the real signal this week isn't "capex raised again" — it's two turns that came after the lock-in. First, for the first time the market split on rewarding the spenders: Microsoft rose about +8% after hours and Amazon about +10%, both rewarded for demand showing up in results; Meta raised capex to about $138.9 billion yet faced selling pressure. Same move, four different stock reactions — the market has formally shifted from "spend boldly and the stock goes up" to "show demand converting before you get credit."

Second, with the demand floor established, optical communications' bottleneck has moved wholesale to the supply side — and this week two supply-side gates opened: upstream InP materials — optical names rallied together on 7/31 with order visibility extending to 2028, but Coherent is stuck on an InP supply bottleneck, with backlog piling up and revenue recognition falling behind; and silicon photonics foundry capacity — TSMC COUPE entered volume production, UMC/GF/Tower are all ramping investment, and UMC Singapore is upgrading its line from 8-inch to 12-inch. Silicon photonics foundry is starting to replicate the "CoWoS model."

Demand is no longer in question. Who can actually deliver on the orders is what decides 2H26.

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That's the summary of this piece.

STT's full read — why the market split on rewards this week, the different timelines of the InP materials gate and the silicon photonics foundry gate, how to track upstream InP (VPEC / LandMark Optoelectronics / Japanese epi suppliers) and silicon photonics foundry (COUPE positioning), and what Broadcom, Astera 3.2T, Intel 18A and Chinese module makers going overseas mean together — is in the premium section.

👉 Subscribe to STT Premium — read the full analysis on vocus (in Chinese): https://vocus.cc/article/6a6fec13fd89780001ce9254

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