Passage L20 CPX: Lightmatter’s bidirectional optical engine

PR Newswire / Lightmatter USA

Overview

Lightmatter has introduced the Passage L20 CPX, the industry’s first bidirectional (BiDi) optical link technology designed for AI infrastructure, simultaneously joining the Open CPX Multi-Source Agreement. This module, leveraging Lightmatter’s Passage L20 optical engine, achieves 6.4 terabits per second (Tbps) in a single-socket form factor while halving the required fiber and connectors. The innovation promises to eliminate fiber limitations in AI clusters, reduce total interconnect network costs by approximately 15%, and accelerate deployment.

In Depth

Key Findings

Lightmatter has announced the Passage L20 CPX, an Open CPX module featuring the industry’s first bidirectional (BiDi) optical link technology for AI infrastructure. This breakthrough solution, revealed concurrently with Lightmatter’s entry into the Open CPX Multi-Source Agreement (MSA), significantly enhances the efficiency of optical interconnects within data centers and addresses critical bottlenecks in AI cluster construction.

Technical Details

The Passage L20 CPX is built upon Lightmatter’s proprietary Near-Package Optics (NPO) platform, the Passage L20 optical engine. This technology enables a high bandwidth of 6.4 terabits per second (Tbps) within a single-socket module, while drastically reducing the number of fiber cables and connectors typically required for optical interconnects by 50%. The bidirectional communication capability optimizes data flow between AI accelerators and simplifies complex physical cabling infrastructure.

Background & Context

The rapid evolution of AI computing has intensified challenges related to bandwidth and power efficiency in data center interconnects. Specifically, the massive data movement between GPU clusters is becoming increasingly difficult to manage with conventional electrical signals or unidirectional optical links. Lightmatter’s NPO technology aims to break through this ‘AI power wall’ by integrating optical I/O directly into computing packages. Participation in the Open CPX MSA underscores the company’s commitment to industry standardization, facilitating broader adoption across the ecosystem.

Strategic Significance & Outlook

The bidirectional CPX optical engine from Lightmatter is projected to reduce the total interconnect network cost for AI data centers by approximately 15%. This cost reduction is expected to accelerate the deployment of large-scale AI infrastructure and simplify fiber plant maintenance and long-term operational expenses. The technology is poised to have a substantial impact on the industry, offering a scalable and cost-effective optical interconnect solution to meet the growing demands of AI workloads.

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