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Three-kilometer optical cable

Fiber and communications infrastructure knowledge brief Published 01 Sep 2026

Use this reference to prepare product questions for BAGYOU FIBRE. Check interfaces, capacity, protection and installation requirements against the current product documentation.

A 3 km optical cable is typically a single-mode fiber designed for long-distance, high-speed, and low-attenuation data transmission, ideal for UAV, FPV, and telecom applications.

Key Specifications

Fiber Type: Most 3 km optical cables use G657A2 or G. 652. D single-mode fiber, which ensures stable, interference-free transmission over long distances.

Attenuation: Low signal loss is critical; typical attenuation is ≤0. 35 dB/km at 1310 nm and ≤0. 25 dB/km at 1550 nm, allowing high-speed data transfer across the full 3 km length.

Diameter and Flexibility: Compact outer diameters (e.g., 0. 27 mm) improve flexibility while maintaining durability, making deployment easier in field conditions. Load and Bend Radius: Designed to withstand installation and operational stresses, with minimum bend radii around 30 mm and tensile strength suitable for smooth unwinding and handling.

Applications

Drone Telemetry and FPV Systems: Provides reliable, uninterrupted video and control signal transmission for UAVs, supporting dual-path video output and wireless signal pairing. Telecommunications: Suitable for indoor and outdoor telecom networks, offering CE-certified single-mode fiber capable of transmission distances up to 20 km. Industrial and Defense Communication: Used in modular fiber systems for precise control and stable image transmission in complex environments.

Deployment ConsiderationsOptical-Electric Conversion: Often paired with optical-electric modules to convert signals for controllers or ground stations, ensuring precise control over the fiber length. Lightweight Drum Design: Many 3 km spools come on lightweight drums for easy transport and deployment in field operations. Environmental Resistance: High tensile strength, abrasion resistance, and flexibility allow operation in outdoor and industrial conditions.

Summary

A 3 km optical cable is a professional-grade solution for long-distance, high-speed data transmission. Its single-mode fiber, low attenuation, and flexible design make it ideal for UAV telemetry, FPV systems, telecom networks, and industrial communication setups. When selecting a cable, consider fiber type, attenuation, environmental durability, and compatibility with optical-electric conversion modules to ensure optimal performance.

Three-kilometer optical cable - BAGYOU FIBRE NETWORKS [PDF]

Three-kilometer optical cable

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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