The 3D photonic interposer supports higher bandwidth and larger die complexes for next-gen AI silicon designs.
Lightmatter announced Passag M1000, a 3D photonic superchip designed for next-generation XPUs and switches. The Passage M1000 enables a record-breaking 114 Tbps total optical bandwidth for the most demanding AI infrastructure applications. At more than 4,000 square millimeters, the M1000 reference platform is a multi-reticle active photonic interposer that enables the world’s largest die complexes in a 3D package, providing connectivity to thousands of GPUs in a single domain.
In existing chip designs, interconnects for processors, memory, and I/O chiplets are bandwidth limited because electrical input/output (I/O) connections are restricted to the edges of these chips. The Passage M1000 overcomes this limitation by unleashing electro-optical I/O virtually anywhere on its surface for the die complex stacked on top. Pervasive interposer connectivity is enabled by an extensive and reconfigurable waveguide network that carries high-bandwidth WDM optical signals throughout the M1000. With fully integrated fiber attachment supporting an unprecedented 256 fibers, the M1000 delivers an order of magnitude higher bandwidth in a smaller package size compared to conventional co-packaged optics (CPO) and similar offerings.
Lightmatter has worked closely with industry leaders, including GlobalFoundries (GF) and Amkor, to facilitate production readiness for customer designs based on the M1000 reference platform, while ensuring the highest standards of quality and performance. The Passage M1000 utilizes the GF Fotonix silicon photonics platform which offers seamless integration of photonic components with high-performance CMOS logic into a single die, creating a production-ready design that can scale effectively with AI demands.
Key features of the M1000 include:
- 8-tile 3D active interposer with integrated programmable waveguide network
- 3D integrated electrical integrated circuits containing a total of 1024 Electrical SerDes
- 56 Gbps NRZ modulation
- 8 wavelength WDM transmission on waveguides and fibers.
- 256 optical fibers edge attached with 448 Gbps bandwidth per fiber
- 1.5 kW power delivery in integrated advanced package (7,735 mm2)
The Passage M1000 and Passage L200, also announced today, accelerate advances in AI by enabling larger and more capable AI models to be trained faster than ever before. Passage M1000 will be available in the summer of 2025, accompanied by the world’s most powerful light engine: Guide, from Lightmatter.
For more information, visit lightmatter.co.
