Is a Tether Enough? How Fiber-Optic UAVs Could Resist Electronic Warfare

On the smoke-filled battlefield between Russia and Ukraine, an ultra-fine optical cable is quietly changing the rules of war. In 2024, the Russian army deployed fiber optic FPVUAV on the front line for the first time. It transmitted data by releasing fiber optic cables and successfully carried out precise strikes against Ukrainian armored targets. Ukraine also quickly followed up and mass-produced fiber optic FPV UAV in early 2025 to break through the Russian military's electronic warfare blockade.

Some analysts pointed out that fiber optic cable's "electronic immunity"The characteristics have prompted both sides to comprehensively upgrade the optical cable detection, anti-entanglement and intelligent recovery systems at the tactical level, indicating that "wired confrontation" will become the new normal in future information operations. But are fiber-optic UAVs really so "invulnerable"?

What is fiber optic UAV?

Optical fiber UAV is a UAV system that realizes control and data transmission through fiber optic cables. It realizes two-way high-speed data transmission and real-time control between UAV and ground control station. Compared with traditional radio-controlled UAV, it has significant advantages in anti-interference, concealment and data transmission stability. The essence of the principle of fiber optic UAV is through optical signals high bandwidth、Anti-interference characteristics Reconstruct the UAV communication link. Despite the limitations of physical connection, it has irreplaceable advantages in scenarios such as high electromagnetic interference environments and covert operations.

The main components of fiber optic UAV

UAV side

onboard computer system: It summarizes the UAV status and data collected by cameras and sensors, receives instructions from the ground control terminal, and processes the data in real time through advanced intelligent algorithms to achieve precise control and stable flight of the UAV.

Air unit photoelectric conversion module: Convert UAV status and electrical signals collected by cameras and sensors into optical signals; at the same time, receive the optical signals transmitted back by the ground-side photoelectric conversion module and convert them into electrical signals.

ground control terminal

Ground end photoelectric conversion module: The received optical signal is restored to an electrical signal; at the same time, the remote control signal and the control instructions issued by the ground control station are encoded into optical signals and sent to the UAV through optical fiber.

ground control station： The electrical signals (UAV status, video stream, sensor data) decoded by the ground-side photoelectric conversion module are displayed on the ground control station; and the control instructions input by the operator at the ground control station are issued.

Fiber optic link

Single-mode fiber (long distance) or multi-mode fiber (short distance), supporting two-way communication (via wavelength division multiplexing WDM or time division multiplexing TDM technology).

Comparison with traditional radio UAV

In practical applications, communication challenges can be solved through the combination of optical fiber and radio. For example, radio is used to provide flexible connectivity for end devices, and optical fiber is used as the backbone to transmit large volumes of data. In this way, optical fiber can ensure uninterrupted communication even in areas with severe local radio interference.

Will fiber optics succeed or fail?

Fiber optic UAV achieves absolute immunity to traditional electromagnetic interference by relying on wired optical cable transmission, providing reliable guarantee for frontline reconnaissance and precision strikes; however, this "lifeline" also brings practical problems such as limited maneuverability, easy entanglement, and limited endurance.

Challenges faced

Fiber weight: 5km (0.5mm diameter) optical fiber plus protective layer may weigh 2.5kg, restricting the UAV load.Environmental adaptability: In complex terrain (such as forests, cities), optical fibers are easily broken, causing loss of control.Release mechanism: The fiber release method needs to be optimized to avoid entanglement or excessive drag affecting flight.

Fiber optic UAV solutions

Based on the LQvideo/data link module, AMOVLABSU17 UAV Equipped with a fiber optic link, you can quickly own a fiber optic UAV.

Hardware equipment

• Video/data link remote control link integrated link based on LQ
  LQ is a video/data link product specially designed for UAV communication. From the beginning of the design, it was considered to integrate a remote control and support serial port and sbus conversion. At the same time LQ supports Star networking* and MESH networking can quickly solve the problem of no signal in blind areas.

• Optical fiber transceiver (photoelectric conversion module)

• fiber optic cable

Working principle

The optical fiber communication system realizes two-way real-time interaction between UAV and the ground through a full-link wired architecture: the downlink control signal is sent by the ground control station, transmitted to the photoelectric conversion module through the LQ ground end, converted into an optical signal, transmitted to the air end photoelectric conversion module through the optical fiber for conversion, and sequentially transmitted to the LQ air end, SU17 UAV, to execute instructions. The uplink data channel reversely transmits the multi-dimensional status data of the UAV (including flight parameters, video images and sensor information), and uses the high-bandwidth characteristics of optical fiber to realize real-time transmission of large-capacity data. This all-fiber architecture effectively avoids the defect that wireless signals are susceptible to interference, and can still maintain stable and low-latency communications in complex electromagnetic environments.

Hardware connection: One of the optical fiber transceivers is installed on the SU17 UAV, and its network port is connected to the network port of the SU17. The other optical fiber transceiver is on the ground end, and its network port is connected to the network port of the LQ remote control. The two optical fiber transceivers are connected using optical fibers to achieve optical fiber communication. Note: When using optical fiber for communication, the ground-end LQ should not be paired with the aircraft, and the wireless link between the ground-end LQ and the aircraft should not be connected to prevent conflicts between the wireless link and the optical fiber link. This step is a key condition for this experiment.

How to disconnect the wireless link between the ground terminal LQ and the aircraft

When SU17 UAV leaves the factory, the LQ ground end and air end are paired by default. We only need to connect the LQ ground end to the PC through a network cable, open the web page to access the device IP address (default is 192.168.1.200), and then open the device configuration interface. The entry method is: web configuration page - system configuration - network settings - module parameters, delete the ESSID parameter, click Save, and then restart. (You only need to restore the ESSID and remove the fiber link to achieve switching between fiber UAV and radio UAV)