Closing the Fiber-Optic Gap: The T-90's Quest for Unjammable Drone Protection

""

The Indian Army's T-90 fleet is the backbone of its armoured formations, with over 1,600 tanks in service and hundreds more on order. However, despite its modernisation, the fleet carries a structural vulnerability that no amount of composite armour or explosive reactive armour can close: the sky above the turret. The Russia-Ukraine war has made the case with brutal clarity, with Russia estimated to have lost over 3,000 tanks and 9,000 armoured vehicles in a single year to drones, artillery, and anti-tank guided missiles.

The threat is not theoretical, and India's T-90s are exposed to the same top-attack and loitering-munition threat that has devastated armoured formations in Ukraine. The Army has responded with a multi-pronged approach, including the development of soft-kill electronic warfare systems, hard-kill active protection systems, and directed energy systems. However, these systems are not enough to close the fiber-optic gap, and a new layer of protection is needed.

Fiber-optic-guided drones have emerged as the single most disruptive tactical innovation of the Ukraine war. These drones spool out a thin glass fiber-optic cable as they fly, carrying control commands from the operator and high-definition video back to the ground at the speed of light, with zero latency and zero electromagnetic signature. The implications for electronic warfare are profound, as no RF jammer can affect a fiber-optic drone in flight. The drone emits nothing, so passive RF detection cannot locate the operator, and GPS spoofing is irrelevant because the video link is the primary navigation aid.

The upgrade cost of these fiber-optic-guided drones is approximately $60, a spool of cable, a dual-channel control module, and a modified ground station. Against a $2-3 million tank, paying $3,000 instead of $500 per drone is a trivial exchange. The latest FPV strike drones increasingly incorporate onboard AI machine-vision modules, allowing the drone to autonomously track and engage targets in the final 500 meters, the exact zone where vehicle-mounted jammers typically sever RF control links.

The Indian Army's response has been multi-pronged, but critically, does not yet close the fiber-optic gap. Soft-kill EW is the foundation of any C-UAS architecture, but it is structurally ineffective against fiber-optic drones. Hard-kill APS like Trophy or the indigenous DRDO system is designed primarily to intercept anti-tank guided missiles, RPGs, and HEAT rounds traveling at high velocities. However, small, slow, low-flying drones present a different detection and tracking challenge, and magazine depth is also a concern.

Directed energy systems, such as 10 kW lasers, are promising against small drones but face serious integration challenges on the T-90. Tanks were not designed to support high-energy directed weapons, and the system requires stable power generation, thermal management, precise tracking, and uninterrupted line-of-sight in dusty, vibrating, high-mobility conditions. Power draw and heat dissipation remain unresolved engineering hurdles, and lasers are also degraded by dust, rain, and fog – common conditions on Indian battlefields.

Bhargavastra, a capable area-defence system, is mounted on a separate 7.5-ton vehicle that operates alongside armoured formations rather than being organically integrated onto each tank. In fast-moving mechanised operations, the reaction window for an FPV drone attack is measured in seconds. A separate C-UAS vehicle cannot protect every tank in a dispersed formation simultaneously.

The result is a gap: between the soft-kill layer that fiber-optic drones defeat by design, and the hard-kill/laser layers that struggle with the engagement geometry and magazine depth of small drone swarms, there is no organic, on-tank capability specifically optimised to kill drones that cannot be jammed. The missing piece is a canister-launched interceptor-drone layer mounted directly on the T-90 – a "drone-vs-drone" capability that physically destroys incoming threats that defeat electronic warfare.

The concept is no longer theoretical, and the time for action is now. Rafael and SpearUAV have unveiled the Iron Wasp, a tube-launched interceptor drone designed to be mounted on armoured vehicles in canisters similar to smoke grenade launchers. The Iron Wasp uses AI-driven autonomous detection, tracking, and engagement, with a kinetic hard-kill warhead of approximately 2 kg that physically destroys incoming drones. It is sensor-agnostic and integrates with Trophy, Drone Dome, and remote weapon stations. Crucially, because it employs kinetic interception rather than electronic countermeasures, it can engage fiber-optic drones that no EW system can touch.

A practical architecture for the T-90 would combine four layers, each addressing a specific threat class. Layer 1 – Soft-kill EW: RF jammers, laser dazzlers, and multispectral smoke to defeat standard RF-controlled FPV drones and break ATGM guidance. Layer 2 – Hard-kill APS: Trophy or the indigenous DRDO system to intercept anti-tank guided missiles, RPGs, and HEAT rounds traveling at high velocities. Layer 3 – Directed Energy: 10 kW lasers to engage small drones, with a focus on integration challenges and unresolved engineering hurdles. Layer 4 – Drone-vs-Drone: Canister-launched interceptor-drone systems to physically destroy incoming threats that defeat electronic warfare.

The logic is compelling: against a drone that defeats all electronic countermeasures, the only effective response is physical interception. An interceptor drone launched from the tank itself – carrying its own seeker, AI guidance, and kinetic warhead – can engage threats that neither jammers nor APS radars are optimised to handle. The engagement cost is asymmetric in the defender's favour: a $500-$1,000 interceptor destroying a $500 attacker is a sustainable exchange ratio, particularly when the alternative is losing a $3 million tank.

The time for action is now. The Indian Army's T-90 fleet needs a dedicated third layer of protection that can physically destroy incoming threats that defeat electronic warfare. The concept is no longer theoretical, and the technology exists. What is missing is the integration imperative – a doctrinal decision to mount interceptor-drone canisters on the T-90 as an organic layer within the APS architecture, rather than treating drone interception as a separate, vehicle-mounted area-defence mission.