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Designed for OCP compatibility, new in-chassis light engine eliminates faceplate bottleneck, powering up to 51.2 Tbps of optical bandwidth for AI scale-up.
Lightmatter has announced the Guide® DR, a high-density laser in an innovative Laser Network Interface Card (“LNIC”) form factor built to OCP NIC 3.0 dimensions. The Guide DR LNIC is a modular, high-density laser array that enables approximately four times the rack density of conventional External Laser Small Form Factor Pluggables (ELSFPs). By relocating the light source from the faceplate into the chassis, the Guide DR LNIC solves the faceplate scaling bottleneck while leveraging existing liquid cooling infrastructure. Guide DR was specifically designed to support Passage® L20 and other high-bandwidth optical interconnects. This provides AI factories the integration flexibility and performance required to drive scale-up clusters to one thousand XPUs and beyond.
As scale-up domains grow, the front panel of every switch and compute tray becomes contested real estate. Each successive accelerator and switch generation increases bandwidth and I/O port count, straining the tray’s physical envelope. Compounding increases in laser power, cooling load, and fiber count can more than double the required number of rack units when using conventional lasers. Guide DR offers a new scaling paradigm. A single LNIC packs dozens of lasers into a liquid-cooled, in-chassis module sized to OCP NIC 3.0 dimensions with industry-standard, pluggable fiber connectors at the output. This concentration of optical power is designed to drive up to 51.2 Tbps of aggregate CPO or NPO scale-up bandwidth. By utilizing four Guide DR modules, a single 1 RU switch tray can support up to 204.8 Tbps of CPO scale-up switching bandwidth—eliminating the need for a larger 4 RU chassis populated with liquid cooled ELSFP lasers.
“With Guide DR, we are removing the physical barriers to next-generation AI infrastructure by delivering the foundational laser innovation required to scale co-packaged optics,” said Nick Harris, Ph.D., Founder and CEO of Lightmatter. “As the industry scales from 200G ports to beyond, traditional light source solutions are hitting a wall. By integrating a high-density, liquid-cooled light source into a standard NIC form factor within the chassis, we unlock the massive optical power necessary for next-generation interconnects in a single 1 RU footprint. This architecture enables the system-level reliability hyperscale operators require, while maintaining the modularity the industry expects.”
“The semiconductor industry has reached a point where AI is driving a new class of compute infrastructure with needs well beyond GPUs and ASICs. As hyperscalers build larger and faster AI facilities, front-panel pluggable external lasers will soon become a major bottleneck,” said Christopher Taylor, Director of TechInsights. “Lightmatter’s transition to a compact, internal Laser NIC design marks a key architectural shift, boosting optical power and interconnect bandwidth while maintaining datacenter physical efficiency.”
The Guide DR Laser NIC will begin sampling in Q4 2026.
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