Bandwidth limitations have become a significant bottleneck in AI and high-performance computing (HPC), as GPUs are underutilized due to bandwidth constraints, with nearly half of their computational power going to waste.
Nvidia is not expected to release optical interconnects for its NVLink protocol until the "Rubin Ultra" GPU compute engine launches in 2027.
This delay has led hyperscalers and cloud builders to explore ways to leapfrog Nvidia’s technology by adopting optical interconnects earlier.
Introducing ChromX
Xscape Photonics, an optical interconnect company spun out of research at Columbia University, is using photonics to realize scalable, high-bandwidth, energy-sustainable, and cost-effective solutions to enable the next generation of AI, ML, and simulation hardware.
This could help the AI industry save billions of dollars in wasted GPU capacity while also offering a path to greener, more sustainable AI infrastructures.
The Next Platform recently took a closer look at Xscape Photonics and spoke with the team behind it, including CEO Vivek Raghunathan, a former MIT researcher and Intel engineer.
Raghunathan highlighted the inefficiencies of current GPU systems, explaining that as scaling continues, the problem shifts "from GPU device-level performance to a system-level networking problem."
This is where Xscape’s technology comes into play. By converting electrical signals into optical ones directly within the GPU, Xscape can dramatically increase bandwidth while simultaneously reducing power consumption.
The startup’s solution, called the "ChromX" platform, uses a laser that can transmit multiple wavelengths of light simultaneously through a single optical fiber - up to 128 different wavelengths (or "colors"). This enables a 32-fold increase in bandwidth compared to lasers that use only four wavelengths.
The ChromX platform also relies on simpler modulation schemes like NRZ (Non-Return-to-Zero), which reduce latency compared to higher-order schemes like PAM-4 used in other systems such as InfiniBand and Ethernet. The ChromX platform is programmable, allowing it to adjust the number of wavelengths to match the specific needs of an AI workload, whether for training or inference tasks.
Raghunathan told The Next Platform’s Timothy Prickett Morgan, “The vision is to match in-package communication bandwidth to off-package communication escape bandwidth. And we think when we use our multicolor approach, we can match that so that giant datacenters - or multiple datacenters - behave as one big GPU.”
The potential impact of this technology is enormous. AI workloads consume vast amounts of energy, and with data center demand projected to triple by 2035, power grids may struggle to keep up. Xscape Photonics’ innovations could offer a vital solution, enabling AI systems to operate more efficiently and sustainably.
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