EON wants to move the data superhighway from ocean fiber to space lasers

As hyperscalers build out data centers around the world, they need to move the bits back and forth, and that often relies on a somewhat brittle network of undersea fiberoptic cables crisscrossing the oceans.

Those cables are tricky to access and repair , much less install. But alternatives aren’t easy to find: Radio transmissions don’t have the bandwidth, which rules out most wireless approaches on the ground or in orbit. But now, maybe lasers could do the job.

Endeavor Optical Networks , a start-up founded in May and emerging from stealth today with $10.75 million in seed funding from General Catalyst and Andreessen Horowitz, is betting on that plan. The co-founders, CEO Charlie Horowitz and CTO Tyler Presser, aim to launch a network of laser-equipped spacecraft to link data centers from orbit.

Most satellite communications networks, even those that provide broadband internet service, aren’t robust enough to carry data at 200 terabits a second or more, the speed of undersea fiber.

However, more powerful satellites and advances in optical technology are making space-to-ground communications with lasers more feasible. NASA used laser comms to beam back data from its most recent Moon mission, while a handful of private space companies, including York, Kepler, and Cailabs, have demonstrated links between Earth orbit and the ground.

Those connections, however, aimed for a throughput of 2.5 Gbps, and EON has a bigger starting goal, Horowitz says: Throughput of 2.4 terabits a second. That will require some secret sauce to deal with one of the biggest problems with laser comms—how the signal is distorted by the atmosphere as it passes through it, particularly when clouds are blocking the way.

EON intends to build a network of about 20 satellites, each able to provide a dedicated link between two continents, with the initial fleet providing 24 hour coverage for early customers. The company will carefully choose ground stations in different regions to serve local data centers and CDNs, using redundant sites and leveraging weather data to ensure a reliable link.

The startup is talking to hyperscalers and AI labs as customers, since they move more data than anyone else, with the focus on underserved or expensive routes: Lengthy ones, like France to Australia, or those without extensive existing infrastructure, like crossing between Africa and South America. They plan to sell dedicated capacity to entice customers interested in full control of their data transit.

First, though, EON will use its seed round to build out an optics lab, hire more engineers, and perform ground tests ahead of a demo satellite they hope to launch around the end of 2027. Horowitz expects that spacecraft to offer the highest optical downlink throughput yet seen—at least 800 gigs and perhaps a terabit.