- UK Defence Innovation opened market engagement on April 2026 for technologies to detect and defeat fibre-optic controlled drones, with submissions due by April 21, 2026.
- The UK Ministry of Defence said the call addresses fibre-optic drones used in Ukraine that remain immune to conventional radio-frequency jamming systems.
UK Defence Innovation has launched a market engagement activity seeking novel technologies capable of detecting and defeating fibre-optic controlled drones, opening a formal call to industry that closes on April 21, 2026.
The solicitation marks the first public acknowledgment by the UK Ministry of Defence that fibre-optic drone control has become a sufficiently pressing operational problem to warrant a dedicated search for solutions. UKDI is running the market engagement on behalf of the MOD, inviting industry to submit novel ideas before midday British Summer Time on April 21. The activity is framed as early market engagement rather than a formal competition, and the authority has noted it does not constitute a commitment to launch a subsequent procurement.
The specific threat driving the requirement is a drone variant that trails a thin fibre-optic cable behind it as it flies, using that physical tether to transmit control signals between operator and aircraft. Because the connection is optical rather than radio-based, it generates no electromagnetic emissions that conventional jamming equipment can target. Electronic warfare systems that detect and disrupt radio frequency signals — the standard countermeasure used against the vast majority of commercial and military drones — have no effect on a fibre-optic link. The operator’s commands travel through glass rather than air, and no amount of radio-frequency noise changes that.
That immunity is what makes the fibre-optic drone a qualitatively different problem from the drone threats that NATO militaries have been racing to address since 2022. The enormous investment in radio-frequency jamming, GPS spoofing, and drone detection radar that Western nations have made in response to drone warfare in Ukraine does not translate directly to this threat. A fibre-optic drone can fly through a dense electronic warfare environment and remain fully under operator control, meaning the defenses a unit believed it had may offer no protection against this specific variant.
The war in Ukraine has served as the primary proving ground for this technology. Russian forces have deployed fibre-optic drones in growing numbers, using them to conduct first-person-view attack missions against Ukrainian armor and positions in areas where Ukrainian jamming capability would otherwise degrade or destroy a conventional drone’s control link. The tethered cable imposes its own constraints — range is limited by how much cable the drone can carry, and the line can snag on terrain — but within those limits the system has proven effective enough that it has spread rapidly across the battlefield and drawn the attention of defense establishments across NATO.
UKDI’s call explicitly references current conflict as the driver, noting that ongoing fighting has demonstrated rapid UAS evolution and that the fibre-optic variant specifically is immune to conventional countermeasures. The authority is seeking ideas across the full engagement chain — detection as well as defeat — suggesting the problem is understood to have two distinct dimensions. Identifying that a fibre-optic drone is present and tracking it is itself non-trivial given that the tethered cable may be nearly invisible at operational altitudes, and the drone’s RF signature is no different from a powered-off device.
No contract value has been published, consistent with the early market engagement format, which is designed to help the authority understand what solutions exist before deciding whether and how to structure a formal competition.