Efforts to transform how data moves between Earth and orbit are gaining momentum, as the European Space Agency (ESA) advances its HydRON programme.

The initiative, short for High thRoughput Optical Network, is designed to bring fibre-like connectivity into space, using laser-based optical communications to deliver data faster and more securely than traditional systems.

At the recent Space Symposium in Colorado Springs, Canadian satellite operator Kepler secured a key contract to lead the programme’s next phase.

The agreement marks a significant step toward building a multi-layered orbital network capable of near real-time data transfer.

Extending internet infrastructure beyond Earth

HydRON’s central aim is straightforward but technically ambitious: replicate the speed and reliability of terrestrial fibre networks in space.

Instead of relying on radio frequency links, which are constrained by bandwidth and increasingly crowded, the system uses laser links to move large volumes of data between satellites and ground stations.

This shift to optical communications enables faster throughput, lower latency and improved security. Laser-based systems are less prone to interference and can handle significantly higher data rates, making them well-suited to the growing demands of Earth observation, navigation and space-based services.

ESA envisions a network in which satellites across different orbits communicate seamlessly, reducing reliance on ground infrastructure and enabling continuous data flow.

A phased approach to building the network

The HydRON programme is structured in three stages, each building on the last.

The first phase focuses on deploying a constellation of satellites in low Earth orbit, linked via optical communications to relay data efficiently.

The second expands connectivity to higher orbital layers, creating links between different altitudes and integrating ground systems into the network.

The third phase, now underway, is centred on interoperability. The goal is to ensure that technologies from multiple providers can function together within a shared orbital infrastructure.

Under an €18.6m contract, Kepler will oversee this stage. The agreement was formalised by Laurent Jaffart and Mina Mitry, in the presence of Josef Aschbacher and Lisa Campbell, alongside representatives from the Canadian Space Agency and the German Aerospace Center.

Jaffar commented: “HydRON will serve as the world’s first multi-orbital optical communications network with a terabit per second capacity, offering resilient and efficient data transfer to address the challenges of bringing connectivity to multiple users securely, quickly and reliably.

“This partnership with Kepler Communications continues our collaboration on the project, as they contribute their expertise in concert with their consortium to deliver within Element 3; the component of HydRON that’s key to building new industrial capabilities, demonstrating new service concepts, fostering system extensions, and promoting international cooperation and interoperability.”

Industry collaboration at the core

A defining feature of this phase is its emphasis on collaboration across the European space sector. Kepler’s satellites will host payloads developed by several partners, each contributing specialised capabilities.

Vyoma GmbH will provide a payload designed to track satellites and orbital debris, supporting safer space operations. Meanwhile, TESAT, MBRYONICS Ltd and Astrolight UAB will deliver the optical communications hardware that underpins the network.

This integration of multiple technologies is central to HydRON’s broader objective: proving that a diverse ecosystem of suppliers can operate cohesively in orbit.

Competing in the future of optical communications

As demand for satellite data continues to grow, pressure on radio frequency spectrum is intensifying. Optical communications offer a viable alternative, enabling higher capacity links while reducing congestion.

HydRON is expected to achieve data transfer rates in the terabit-per-second range, a significant leap over conventional systems.

Just as important, it will test how space-based optical networks can connect seamlessly with terrestrial fibre infrastructure.

For ESA, the programme is about more than speed. It is also a strategic move to strengthen Europe’s position in a competitive global market.

By fostering interoperability and supporting industry participation, HydRON lays the groundwork for flexible, resilient communication systems in space.

If successful, the network could fundamentally change how quickly actionable data is delivered from orbit, shrinking transmission times from minutes to seconds and opening new possibilities for real-time applications across science, security and commercial services.