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Power-transmitting optical cable

Optical network knowledge brief Published 16 Feb 2024

Prepared for preliminary research by the COETZER OPTICAL knowledge desk. Confirm compatibility, loss budgets and installation requirements against current standards and product documentation.

Power transmission optical cables, including Power-over-Fiber (PoF) and Optical Ground Wire (OPGW), enable electrical power and data transmission using optical fibers, offering high safety, immunity to electromagnetic interference, and long-distance capabilities.Power-over-Fiber (PoF)

Power-over-Fiber is a technology that transmits optical power through fiber and converts it into electrical power at a remote location using a photovoltaic cell. A typical PoF system consists of:

  • Light sources: Usually laser diodes emitting in the 750–980 nm range for short distances, or longer wavelengths for reduced scattering over longer distances. LEDs are less suitable due to incoherent emission.
  • Optical fibers: Single-mode or multimode fibers guide the light efficiently to the receiver.
  • Photovoltaic converters: Semiconductor devices (e.g., GaAs, InP, or InGaAs) convert optical power into electrical power. PoF systems can transmit hundreds of milliwatts to several watts, with potential for higher power using large-core multimode fibers. The main advantages include complete electrical isolation, immunity to electromagnetic interference, intrinsic safety in explosive environments, and lightweight cables. Typical electrical-to-electrical conversion efficiency ranges from 20% to 30%, with some systems exceeding 40% depending on laser and photovoltaic efficiency. Safety measures are required to prevent laser hazards if fibers break during operation .
Optical Ground Wire (OPGW)

OPGW cables are used in high-voltage overhead power lines and combine grounding and communication functions. Key features include:

  • Structure: A tubular core containing one or more optical fibers, surrounded by layers of steel and aluminum for mechanical strength and grounding.
  • Functions: Provides lightning protection, bonds towers to earth ground, and enables high-speed data transmission for utility control, monitoring, or leased communication services.
  • Advantages: Optical fibers are insulators, immune to electrical noise and lightning induction, and allow long-distance, high-speed data transmission. OPGW cables are installed on top of pylons, offering high reliability and weather resistance, and are suitable for voltages above 110 kV .
Comparison and ApplicationsFeaturePower-over-Fiber (PoF)Optical Ground Wire (OPGW)Primary purposeRemote electrical power deliveryGrounding and data transmissionPower deliveryUp to several watts (potentially higher)No power delivery; data onlySafetyElectrically isolated, safe in explosive environmentsElectrically insulated, protects against lightningTypical useIndustrial sensors, remote electronics, hazardous areasHigh-voltage transmission lines, utility communicationDistanceShort to several kilometers depending on fiber and wavelengthTens of kilometers with low-loss single-mode fibers

Both technologies leverage optical fibers to overcome limitations of copper cables, such as voltage drop, electromagnetic interference, and safety hazards, while enabling integration of power and communication in modern electrical networks .

Power-transmitting optical cable - COETZER OPTICAL SYSTEMS (Pty) Ltd [PDF]

Power-transmitting optical cable

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Technical note

This reference is intended for preliminary optical-network research. Compatibility, link budgets, installation methods, test limits and applicable standards must be verified for the specific project.

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