Fiber optic spools made in Lithuania, EU

Make Your Drones
Unjammable

Unjammable control and live video feed — up to 50 km / 31 miles. The world's highest-quality, lowest-weight fiber optic spools for drones.

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From ISR to Strike:
We Enable the Full Mission Cycle.

No gimmicks. No theory.

Only field-proven solutions dedicated for those 3–5 soldiers heading to their mission in a 4x4 pickup.

Operator attaching an OPTAC fiber optic spool to a UAV in the field

About us

Developed on the battlefield. Manufactured in Lithuania, EU.

Who we are defines what we do, and what we do reflects what we believe in.

We are not just engineers. Our team unites aerospace, satellite launches, advanced 3D printing, heavy industry, programming, and electronics — together with military service and combat UAV experience on Ukraine's frontlines.

Built on NATO's eastern edge in Lithuania, Europe, with pride in defending freedom. Featured in American and Ukrainian media.

OPTAC team members with combat UAV experience

If NATO ever comes face to face with the common enemy…

…many Western-made FPV drones might not even lift off the ground.

As a constant standard, today's armed conflict zones are heavily saturated with electronic warfare and GPS jamming.

Even with newly tuned drones on uncommon RX/VTX frequencies, combat UAV teams still have no certainty they'll fly — or hit their target.

You may build incredible drones — but can they fly when 300 MHz to 1050 MHz, 1.2–1.5 GHz, 2.1–2.7 GHz, 2.4 GHz, 5.2 GHz, and 5.8 GHz are under enemy jamming?

OPTAC fiber optic spool

The solution

The world's highest-quality, lowest-weight fiber optic spools for drones.

Unjammable control and live video feed — up to 50 km / 31 miles.

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Feature-rich. Mission-ready. Cost-effective.

OPTAC does not have the limitations of other fibre optic systems.

Fly fast, fly high

42 m/s (150 km/h / 81 kt) speed and 150 m (492 ft) altitude are not the limit.

Complete unwinding

Complete unwinding — to the bone, every time. 99.9% complete spool unwinding guarantee.

Any platform

Mounts easily on any drone platform. Custom integrations for air, land, and naval systems.

Incomparable build quality

Incomparable build quality compared to traditional fiber optic spools. Backed by EU warranty.

OPTAC fiber optic spools in service with the 3rd Separate Assault Brigade
In service on the frontline — 3rd Separate Assault Brigade, Ukraine.

Specifications

Mission-Ready Fiber Optic Spool Models for UAVs

VTX+RX spool model Weight in flight Dimensions
10 km / 6.2 mi1.0 kg / 2.2 lbs30 × 13.5 cm / 11.8 × 5.3 in
15 km / 9.3 mi1.3 kg / 2.9 lbs30 × 13.5 cm / 11.8 × 5.3 in
20 km / 12.4 mi1.6 kg / 3.5 lbs36 × 13.5 cm / 14.2 × 5.3 in
25 km / 15.5 mi2.0 kg / 4.4 lbs36 × 13.5 cm / 14.2 × 5.3 in
35 km / 21.7 mi2.7 kg / 5.95 lbs36 × 16 cm / 14.2 × 6.3 in
40 km / 24.9 mi3.2 kg / 7.1 lbs44 × 16 cm / 17.3 × 6.3 in
50 km / 31.1 mi4.0 kg / 8.8 lbs44 × 16 cm / 17.3 × 6.3 in

Always request the latest specifications, as our products are constantly being improved.

Custom integrations for air, land, and naval platforms — with tailored lengths and configurations available on request.

Request latest specs
OPTAC 25 km spool weighed at 2078 g
25 km / 15.5 mi spool on the scale.

Why unique

Engineered and manufactured on equipment we designed and built in-house, then precisely calibrated for UAV flight dynamics.

4000+
Spools per month
×2 / 3w
Production capacity can be doubled every three weeks
100%
China-free production possible on demand
1 year
EU warranty
99.9%
Complete spool unwinding guarantee*

* Ask us for guarantee terms.

In-house designed spool winding equipment Rows of OPTAC spools in production

Ground control

OPTAC OPTX Ground Control Modules

Seamless, click-in solution that transforms traditional RC controllers into fiber-optic systems.

The OPTX JR-bay module clicks into standard RC transmitters — RadioMaster Boxer, TX12 and compatible radios — connecting your controller and goggles to the fiber line in seconds. No custom hardware, no soldering.

Ask about OPTX modules
Operator using RC controller and goggles connected via OPTX module to the fiber line OPTAC OPTX MK4 ground control modules

Fiber optic datasheet

High-reliability, bending-insensitive single-mode fiber.

OPTAC uses only high-reliability bending-insensitive single-mode optical fiber engineered for mission-critical optical communication systems where compact routing, mechanical robustness, and stable signal integrity are required. It maintains low attenuation and consistent optical performance even under tight bending. High-performance dual-layer acrylate coatings provide robust mechanical protection and long-term environmental stability under temperature cycling, humidity exposure, and other demanding field conditions.

Optical properties
CharacteristicConditionDataUnit
Attenuation1310 nm≤ 0.36dB/km
1383 nm≤ 0.34dB/km
1550 nm≤ 0.22dB/km
1625 nm≤ 0.24dB/km
Zero dispersion wavelength—1300–1324nm
Zero dispersion slope—≤ 0.092ps/(nm²·km)
Max single-fiber PMD / link value (M=20, Q=0.01%) / typical—≤ 0.2 / ≤ 0.06 / 0.04ps/√km
Optical cable cutoff wavelength λcc—≤ 1260nm
Mode field diameter (MFD)1310 nm8.6 ± 0.4µm
1550 nm9.9 ± 0.5µm
Effective group refractive index1310 nm1.4683—
1550 nm1.4688—
Discontinuity of attenuation1310 nm≤ 0.05dB
1550 nm≤ 0.05dB
Geometrical features
CharacteristicDataUnit
Cladding diameter125 ± 0.7µm
Cladding non-circularity≤ 0.7%
Coating diameter245 ± 10µm
Coating/bonding concentricity error≤ 12.0µm
Core/encapsulant concentricity error≤ 0.5µm
Warpage (radius)≥ 4.0m
Environmental characteristics (1310 nm & 1550 nm & 1625 nm)
CharacteristicConditionDataUnit
Temperature additional attenuation−60 °C to +85 °C≤ 0.05dB/km
Temperature-humidity cycle additional attenuation−10 °C to +85 °C, 98% relative humidity≤ 0.05dB/km
Submersion additional attenuation23 °C, 30 days≤ 0.05dB/km
Hydrothermal additional attenuation85 °C and 85% relative humidity, 30 days≤ 0.05dB/km
Dry heat aging85 °C, 30 days≤ 0.05dB/km
Mechanical characteristics
CharacteristicConditionDataUnit
Filtering tension—≥ 9.0N
Flanged pipe, 10 turns, diameter 30 mm1550 nm≤ 0.03dB
Flanged pipe, 10 turns, diameter 30 mm1625 nm≤ 0.1dB
Flange 1, 1 circle, diameter 20 mm1550 nm≤ 0.1dB
Flange 1, 1 circle, diameter 20 mm1625 nm≤ 0.2dB
Flange 1, 1 circle, diameter 15 mm1550 nm≤ 0.5dB
Flange 1, 1 circle, diameter 15 mm1625 nm≤ 1.0dB
Stripping resistanceaverage / peak1.0–5.0 / 1.3–8.9N

Integration

OPTAC VTX/RX 10–40 km Hardware Integration Guide

Pinout — connect to flight controller

PinSignalConnect to FCDescription
1 BlackGNDGNDGround
2 RedVINBATPower input 5.5 V – 26 V
3 WhiteSBUS OUTSBUS INControl output to FC
4 YellowVIDEO INVTX / VIDEO OUTAnalog video input
  • Cable length: 20 cm
  • Cable interface: Molex Picoblade 4-pin, 1.25 mm pitch male
  • Mating part: Molex Picoblade 4-pin, 1.25 mm pitch female
  • Mounting on UAV: secure with zip ties, 5 cm behind rear propellers

RadioMaster Boxer / TX12 config with OPTX JR module

  1. Open Model Setup (long-press MDL)
  2. On the Setup page, enable External RF
  3. Set Mode = SBUS
  4. Set Inversion = Non-inverted
  5. Leave Trainer Mode = OFF
  6. Go to SYS page to verify channel order = AETR1234

Drone config

  1. Open Betaflight / iNav / ArduPilot
  2. In Ports tab enable Serial RX on the UART where SBUS is connected
  3. Save and reboot
RadioMaster transmitter configuration screens for the OPTX module

Need help with integration on your platform? Talk to our engineers →

In the media

Featured in American and Ukrainian media.

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Get the full picture.

Download the OPTAC brochure — problem, solution, spool models, fiber datasheet and integration guide in one PDF.

Download Brochure (PDF)

Contact

Request a quote or the latest specs.

Tell us about your platform and mission requirements — we'll come back with pricing, lead times, and the latest specifications.

We work with armed forces, government procurement, and defense industry partners. End-use documentation may be required.

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