Ayar Labs ran a live optical compute tray as Lumentum can't meet about 70% of demand for some lasers

A live tray, with its light piped in from outside

On October 13, 2026, at the Open Compute Project Global Summit in San Jose, a compute tray from Wiwynn, the Taiwanese server and rack maker, ran live with its optical links up. Silicon packaged by Global Unichip (GUC), an ASIC design services firm traded in Taipei, carried Ayar Labs'PVT$6.24B — Ayar Labs, private, latest valuation $6.24B TeraPHY optical engines, fed by SuperNova light sources in the industry-standard ELSFP form factor, a pluggable module that supplies the lasers the engines themselves leave out. Telemetry streamed from inside the package in an Open Rack v3-ready chassis, the first live system-level proof↗ after earlier rack-level architecture work ¹². "The bar is no longer whether it works; it's whether it can be deployed and managed at scale," Ayar chief executive Mark Wade said ¹. Ben Bajarin↗, posting on X from the show, noted the tray's outbound network links still run on pluggable optics ³.

The light source is the part that is sold out

Co-packaged optics pushes the lasers out of the chip package and into a separate module, which makes that module the gate on the whole ramp. Lumentum▼−4.13% — Lumentum, down 4.13 percent today (NASDAQ: LITE), the optical and laser component maker, is effectively closed to new demand: chief executive Michael Hurlston told Bloomberg Television in Tokyo on October 9↗ that Lumentum↗ cannot satisfy roughly 70% of demand for some products through next year, and about 30% of demand for other products through 2028, with capacity committed into early 2029 ⁴⁵. New laser capacity takes about three years to reach customers, so relief arrives no earlier than 2029 or 2030, despite new fabs in Greensboro, North Carolina and Japan ⁴⁵. On October 6, wafer maker AXT (NASDAQ: AXTI) announced a six-year Lumentum reservation for indium phosphide↗, the substrate those lasers are built on, backed by two deposits of $43.5 million, $87 million in total, running through the end of 2031; Coherent▼−4.61% — Coherent, down 4.61 percent today made a similar $22.29 million prepayment to AXT in June ⁶⁷. AXT grows all of its wafers in China, and in a August 13 filing↗ said it could not estimate when Beijing would license indium phosphide shipments to US customers again ⁷. The 2028 optical ramp is being allocated now, and the queue forms at the laser fab.

An unconfirmed cut-off, and the money that moved anyway

On October 10, an X account called @insane_analyst wrote that Lumentum had "cut off" Ayar Labs↗ and called the ELSFP part on show "a prototype that will never ramp" ⁸. Neither company has confirmed it, and Ayar sells SuperNova as its own product line ², so it stands as a claim about supply, not a fact. The cash is on the record regardless. Nvidia▼−2.02% — Nvidia, down 2.02 percent today has made a $2 billion strategic investment in Lumentum ⁵. Ayar raised $650 million across 2026↗, a $500 million Series E in March plus a $150 million extension in September that added Wiwynn as a backer, and a $225 million secondary led by Artisan Partners' Antero Peak arm valued the startup above $5 billion ⁹. Wade's deadline is fixed: everything qualified for volume production by the end of 2027, for customer ramps in 2028 and 2029 ⁹.

The escape route runs through CMOS fabs

The same summit produced a second answer to the shortage. LightmatterPVT$4.63B — Lightmatter, private, latest valuation $4.63B showed a 204.8 terabit-per-second co-packaged optics switch tray, built with Flex in a single rack unit↗, and a 102.4 Tbps accelerator tray, both to open rack standards ¹⁰. Its Guide lasers are fabricated in high-volume CMOS fabs rather than the compound-semiconductor lines that constrain the industry, and Lightmatter estimates its foundry partner could add roughly 30% to industry laser capacity over the next two years ¹¹. First specifications from the 20-company Open Silicon Photonics initiative land in the fourth quarter of 2026 ¹¹. Watch two things after that: whether a hyperscaler commits to the open trays, and whether anyone confirms who supplies Ayar's light.