Kepler to lead interoperability tests for ESAs HydRON optical relay network
TAMPA, Fla. - The European Space Agency has picked Canadian small satellite operator Kepler Communications to lead a hosted payload mission to test terminal interoperability for HydRON, ESA's flagship optical relay network program.
Kepler signed an 18.6 million euro ($22 million) prime contract April 14 for the third element of HydRON (High-throughput Optical Network), the final step in demonstrating a multi-orbit, terabit-per-second transport system designed to extend the reach of terrestrial fiber networks.
ESA selected the Canadian company in 2024 to lead the first HydRON element, comprising a ring of 10 optical satellites. Kepler CEO Mina Mitry told SpaceNews that those satellites, along with the hosted payload third element, are slated for deployment in low Earth orbit (LEO) around 2028.
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Europe's Thales Alenia Space was picked to lead a second element, involving a LEO spacecraft designed to connect with ground stations and other LEO satellites, as well as a geostationary spacecraft to showcase HydRON's multi-orbit extension.
Both elements span initial design to deployment, with additional contracts likely to follow to support a demonstration phase.
Testing interoperability
The third HydRON element focuses on validating interoperability across multiple optical communication systems.
Kepler said it will provide a satellite platform for the mission, using the same bus planned for its HydRON relay spacecraft. It will be joined by multiple European partners, including:
Germany's Vyoma is also providing a space situational awareness hosted payload for the mission.
"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," said Laurent Jaffart, ESA director of resilience, navigation and connectivity.
"Today's signature with Kepler Communications continues our collaboration on the project, as they contribute their expertise in concert with their consortium to deliver 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."
Building a relay network
Kepler is also deploying its own optical data relay constellation, after shifting away from a legacy satellite business providing low-data-rate connectivity for devices beyond the reach of terrestrial networks.
The company, which first tested optical inter-satellite links between a pair of prototypes in LEO in 2024, launched the first tranche of 10 optical relay satellites for its own network in January.
The roughly 300-kilogram satellites are equipped with optical terminals and onboard computing to enable low-latency data transfer and processing in orbit.
"We will launch Tranche 2 in approximately 2028 and will launch additional hosted payload missions in between to expedite customer adoption of optical technology," Mitry said via email.
HydRON's Element 1 satellites are slated to be part of Kepler's Tranche 2.
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