Active Copper Cables Challenge Photonics Hype in Data Transmission Market

In recent weeks, photonics has dominated discussions on Wall Street and in Israel, with new funds raising millions on promises that light will replace electricity for data transmission. Photonics uses photons to transfer data, offering faster speeds and less heat compared to traditional copper cables, which are likened to congested dirt roads. However, a detailed techno-economic analysis reveals a more nuanced reality.

Despite the hype around photonics, the copper cable industry has innovated with "Active Electrical Cables" (AEC) that embed tiny integrated circuits called "Retimers" directly into copper connectors. These components clean noise, amplify signals, and enable copper cables to transmit data at high speeds over short distances of 5 to 7 meters. This is crucial inside server racks where artificial intelligence computations occur, as photonic lasers suffer from heat sensitivity, aging, and intermittent disconnections that can disrupt costly AI training.

Active copper cables are reportedly 100 to 1,000 times more reliable than photonic lasers for short-range connections and can reduce power consumption by about 50% by avoiding electrical-to-optical conversions. Nvidia, a leading market player, chose massive copper cabling for its flagship system rather than photonics, highlighting the practical engineering advantages and cost savings of copper.

While photonics remains the only viable solution for long-distance data transmission between data centers, the current market is split. Active copper dominates short-range internal server connections, while photonics leads over longer distances. Investors are cautioned against blindly following photonics hype, as the sector faces risks after sharp price increases. A balanced investment approach includes both photonics firms poised for long-term growth and companies producing active copper cables that profit from present demand.

In summary, the transition to photonics is gradual, and the established copper technology continues to drive current profits. Understanding this balance is key for investors navigating the evolving data transmission landscape.