Lightmatter
Company
Networking
Photonic interconnect — moving light into the chip package itself.
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Lightmatter builds photonic interconnect for AI clusters: its Passage platform is a photonic interposer that chips sit on directly, replacing electrical I/O with light at the package boundary. A 2024 round valued it at a reported ~$4.4B — the best-funded bet that the next bandwidth wall after copper will be broken inside the package, not at the switch.
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Record reviewed as of 2026-01-15 — see Methodology.