Nvidia spends $6.5B to replace copper with light in AI data centres

Since the start of March, Nvidia has poured at least $6.5 billion into photonics companies, establishing itself as the dominant investor in a technology that many industry experts believe will eventually supplant copper wiring as the primary backbone of AI data centres. This aggressive spending spree signals a clear strategic bet: copper, long the standard material for shuttling data between servers, has hit a performance ceiling that photonics can break through.

The core problem is simple. As AI models grow larger and more complex, the sheer volume of data moving between thousands of GPUs creates a bottleneck. Electrical signals sent over copper cables generate heat and lose integrity over distance, limiting both speed and energy efficiency. Photonics, which uses light pulses instead of electricity, offers a radically different path. Light can carry far more data, over longer distances, with significantly less power consumption and heat generation.

Nvidia’s investment blitz reflects a conviction that this shift is not just possible, but necessary. By funneling billions into photonics startups and established players, the company is effectively building a new supply chain from scratch. The move is also defensive: if photonics becomes the standard, Nvidia wants to own the transition rather than be disrupted by it. The company has not publicly detailed every acquisition or stake, but the total commitment since early March underscores the urgency.

Industry observers note that copper remains ubiquitous in current data centres, but its limitations become more punishing with every generation of AI hardware. Nvidia’s spending spree suggests the company sees photonics as the only viable long-term solution for keeping pace with the exponential growth in compute and data demands. The bet is enormous, but the payoff could redefine how the world’s largest AI clusters are built and operated.