Serenity, the stock-picker tracked on this site for his habit of buying the obscure upstream suppliers that feed the AI datacenter buildout, spent Wednesday parsing a Morgan Stanley note on possible US restrictions on optical transceivers — and framed it as broadly supportive of his photonics thesis.

The policy signal. According to the research he flagged, Morgan Stanley analysts met with Washington officials and came away thinking any FCC rules on optical modules would likely start at the 3.2-terabit tier, leaving today's workhorse 800G and 1.6T links untouched. Chinese-made modules could still qualify if 65% of their bill of materials is US content — a bar that modules using American DSPs and lasers already sit near. The upshot Serenity drew: rather than reshuffling who sells transceivers, the rules would keep the market for the underlying Western components tight, which in his framework is exactly where the pricing power lives. Optical transceivers are the pluggable modules that move data as light between switches and GPUs in AI datacenters; their key ingredients — lasers, DSP chips and amplifiers — are the "chokepoints" (scarce upstream parts with few substitutes) he hunts.

His read on the names. He treated the note as a quiet validation of his upstream tilt. AXT, his highest-conviction holding and the supplier of indium phosphide (InP) substrates — the compound-semiconductor wafers that high-speed lasers are built on — got a nod because the analysts named InP substrate supply, not the rules themselves, as the real variable constraining the buildout. That is precisely his AXT argument: it is the material bottleneck underneath the whole optical stack.

He singled out Sivers, the tiny Swedish maker of continuous-wave InP lasers (the light source for co-packaged optics) that is his top small-cap bet, as the sharpest angle on tighter laser pricing. He noted the company has described "tremendous" new capacity coming online and, reasoning from its disclosed foundry partnerships, inferred much of it is US-based — which would make Sivers a direct beneficiary of any US-content requirement. He also pointed to channel-check signs it is beginning to work with Chinese module makers, giving it a path to supply both sides.

Applied Optoelectronics, his Made-in-America vertically integrated transceiver long, screens as a large beneficiary under US-content rules, while incumbents Lumentum and Coherent — his quality large-cap photonics holdings tied to hyperscaler and Google TPU optics — would also be comfortable. On the component edge he floated Semtech, which supplies transimpedance amplifiers and drivers, and MaxLinear on the DSP side as likely winners, though he owns neither and has previously admitted missing MaxLinear's big run.

The takeaway. Serenity's one-line conclusion: Western supply chains for lasers, DSPs and amplifiers are already bottlenecked, and qualified capacity only becomes more valuable from here. No new buys or trims were disclosed today — the note read as a conviction check rather than a portfolio move.

*This is derived commentary for information only, not investment advice.*