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Lightmatter

Paid

The photonic (super)computer company

4.7
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Type
Saas
Founded
2017
Company
Lightmatter
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About Lightmatter

Lightmatter builds photonic interconnects and light engines for AI supercomputing, overcoming the fundamental limitations of electrical I/O in scaling AI infrastructure. Founded in 2017 by MIT researchers, the company has raised $850 million at a $4.4 billion valuation and offers a family of products including Passage photonic interconnects (Passage L200, L20, M1000 EVK, EVK100, EVK50) and Guide light engines. Its edgeless I/O architecture enables unlimited bandwidth scaling, and its co-packaged optics technology delivers high bandwidth density and energy efficiency (down to 1.9 pJ/bit). Lightmatter's technology is production-ready, with partnerships with TSMC, GlobalFoundries, and Tower, and reference platforms currently in customer hands. The company aims to make frontier AI training economically viable by eliminating communication bottlenecks in large GPU clusters.

Key Features

Edgeless I/O architecture enabling unlimited bandwidth scaling
Co-packaged optics (CPO) for dense, fast interconnects
Passage photonic interconnect platform with multiple products (L200, L20, M1000, EVK100, EVK50)
Guide light engine – Very Large Scale Photonics technology for lasers and photonics on a single chip
16-wavelength bidirectional DWDM link achieving 8X leap in fiber bandwidth density
Energy efficiency: 1.9 pJ/bit (Passage EVK100) and 2.6 pJ/bit (Passage EVK50)
Passage M1000 3D photonic interposer delivering 114 Tbps across 4,000 mm²
Rack-level integration from wafer to system (Passage M1000 EVK)

Pros & Cons

Pros
  • Overcomes fundamental electrical I/O bandwidth and reach limitations
  • Production-ready technology with multiple generations and customer reference platforms
  • Energy-efficient interconnects (as low as 1.9 pJ/bit) reduce power consumption
  • Enables 4x faster training for same power compared to electrical interconnects
  • Proven partnerships with major foundries (TSMC, GlobalFoundries, Tower) for high-volume manufacturing
  • Clear roadmap for continued scaling to 1+ Pbps

Best For

Frontier-scale AI model training with 100,000+ GPU clustersHigh-bandwidth scale-up and scale-out networking in AI data centersCo-packaged optics for next-generation AI infrastructureEliminating communication bottlenecks in large AI training clustersConnecting GPUs, TPUs, and data center switches for massive parallelism

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FAQ

What is Lightmatter?
Lightmatter is a company building photonic interconnects and light engines for AI supercomputers, founded in 2017 by MIT researchers. It offers Passage photonic interconnects and Guide light engines to scale AI infrastructure.
How does photonic interconnect solve AI scaling problems?
Photonic interconnects use light instead of electricity to move data, eliminating resistive losses, allowing signals to cross without interference, and carrying multiple signals on a single fiber. This overcomes the bandwidth and reach limits of electrical I/O, enabling larger GPU clusters and faster AI training.
What products does Lightmatter offer?
Lightmatter's products include the Passage interconnect platform (Passage L200, L20, M1000 EVK, EVK100, EVK50) and the Guide light engine. These cover co-packaged optics, 3D photonic interposers, and high-bandwidth bidirectional links.
Is Lightmatter's technology production-ready?
Yes. Lightmatter states its technology is not research or vaporware; it has multiple production-ready generations, partnerships with TSMC, GlobalFoundries, and Tower, and reference platforms in customer hands today.
Who are Lightmatter's investors?
Lightmatter has raised $850 million and has a $4.4 billion valuation. Specific investors are not listed on the website, but its board includes notable figures such as Olivia Nottebohm, Erik Nordlander, and others.