The European Space Agency's ambition to treat orbital space as a seamless extension of Earth's fiber-optic infrastructure is moving into its next phase. A consortium led by Kepler Communications, a Canadian satellite operator specializing in data relay services, has been selected to test HydRON — an orbital communications network colloquially known as "fiber in the sky." The project aims to replace or augment traditional radio-frequency links with high-capacity optical laser terminals, effectively bringing the bandwidth and reliability of terrestrial internet to the vacuum of Low Earth Orbit.
Central to the upcoming 2027 mission is the ATLAS-X, a new laser communications terminal developed by Lithuanian startup Astrolight. The terminal is designed to handle both space-to-space and space-to-ground data transmission, serving as the primary hardware for a satellite that will tap into the HydRON network as a third-party user. By validating the ATLAS-X in orbit, the team hopes to prove that the network can support the high-capacity, secure data flows required by modern satellite operators and government agencies.
From radio waves to laser light
The shift toward optical communication in space is not new in concept, but it has accelerated sharply in recent years. NASA's Laser Communications Relay Demonstration, launched in 2021, proved that optical links could deliver data rates far exceeding those of conventional radio-frequency systems. The European Data Relay System, operated by Airbus on behalf of ESA, has similarly used laser inter-satellite links to move Earth-observation data from LEO to geostationary orbit and down to the ground. HydRON represents a more ambitious step: rather than point-to-point relay, it envisions a networked architecture — a mesh of optical nodes that functions less like a dedicated pipeline and more like a backbone router in orbit.
The technical rationale is straightforward. Laser links operate at higher frequencies than radio, which translates into significantly greater data throughput for a given terminal size. They also produce tightly focused beams, making them inherently harder to intercept or jam — a property that carries obvious appeal for defense and intelligence applications. As the LEO environment grows more congested with commercial constellations, the radio-frequency spectrum faces mounting pressure from interference and regulatory allocation constraints. Optical communication sidesteps much of that congestion by operating in an entirely different part of the electromagnetic spectrum.
The HydRON architecture envisions a multi-layered system: a ring of ten optical satellites in LEO working alongside "satellite collectors" that bridge data between various orbits and ground stations. If the 2027 test validates the concept, it would mark a meaningful transition from demonstration to operational prototype.
Strategic stakes for European autonomy
The geopolitical dimension of HydRON deserves attention. Europe's space sector has watched the rapid scaling of American commercial constellations — SpaceX's Starlink chief among them — with a mixture of admiration and concern. Starlink already uses laser inter-satellite links extensively, giving it a degree of network resilience and global coverage that few competitors can match. For European institutions, building an independent optical backbone is not merely a technical exercise; it is a question of sovereign communications infrastructure. The ability to route sensitive government and military data through European-controlled optical nodes, rather than relying on third-party networks, aligns with broader EU efforts to reduce strategic dependencies in critical technology sectors.
Kepler Communications occupies an interesting position in this landscape. The company has focused on building a data-relay network for other satellite operators — a kind of orbital utility service — rather than competing directly in consumer broadband. Partnering with Astrolight, a relatively small firm from Lithuania, also reflects a pattern increasingly visible in European space programs: distributing technology development across a wider industrial base rather than concentrating it in a handful of legacy prime contractors.
Whether HydRON can scale from a ten-satellite demonstration ring to a commercially viable backbone remains an open question. The economics of optical ground stations — which require clear-sky conditions and therefore redundant geographic placement — add complexity that radio-frequency systems do not face. And the competitive pressure from well-funded American operators, already deploying laser links at constellation scale, sets a pace that publicly funded European programs have historically struggled to match. The 2027 test will not resolve these tensions, but it will reveal whether the underlying technology can perform at the level the architecture demands — and whether Europe's approach to orbital connectivity can carve out a distinct and defensible role.
With reporting from Payload Space.
Source · Payload Space
