A standard PON network has a fixed architecture:
OLT (Optical Line Terminal, core equipment in the central office) → Optical Fiber + Optical Splitter (ODN, Optical Distribution Network) → Remote end devices such as ONU (Optical Network Unit), optical network terminals, IP cameras, and sensors
Standard PON: Only data-carrying optical signals (e.g., 1310/1490nm wavelengths commonly used in GPON) are transmitted over the fiber. It can only carry data for internet access and video surveillance, but cannot deliver power to remote devices. End devices must be connected to the mains power via separate power cables.
PON with POF Function: A dedicated optical power supply module is added to the OLT side in the central office, which injects a dedicated power supply laser beam into the same optical fiber. This laser uses wavelengths completely non-overlapping with the data-carrying light, equivalent to two dedicated non-interfering lanes on the same road, with data and power transmission operating separately. On the remote terminal side, a corresponding optical-to-electrical converter module is installed to convert the incoming laser power from the fiber back into direct current (DC) to directly power the end devices.
With POF, there is no need to lay separate power cables. A single optical fiber handles both data transmission and power delivery for end devices in one step.
The greatest value of POF is solving the wiring pain points that standard PoE and conventional PON cannot address, namely long-distance deployment, locations without mains power access, and high-safety requirement scenarios. These are also the most common use cases for POF in PON projects:
Remote locations without mains power access: For scenarios such as highway checkpoints, forest fire prevention cameras, reservoir and river monitoring sensors, and surveillance units in remote rural areas, which are kilometers away from the central office. Laying separate mains power lines for these sites incurs extremely high costs, and the lines are vulnerable to theft and lightning strikes. POF has a transmission distance fully matched with PON, reaching up to 20 km in standard configurations. It can be implemented with a single optical fiber, eliminating the need for additional wiring.
High-risk explosion-proof scenarios: Including underground coal mines, chemical industrial parks, gas stations, and oil and gas fields, where standard electrical wiring is strictly prohibited due to the risk of explosion from electric leakage and sparks. Optical fiber itself is fully insulating. POF only transmits light, not electric current, throughout the entire link, delivering zero risk of electric shock and spark generation. It fully complies with explosion-proof requirements and is a standard feature for private PON networks in underground mines.
Non-intrusive renovation of existing projects: For surveillance and smart upgrade projects in existing industrial parks and residential communities, where PON optical fibers are pre-buried but no power cables are reserved. POF eliminates the need for wall breaking and re-cabling. Simply adding POF modules to the existing PON equipment can power new cameras and access control devices, directly cutting the renovation period and cost by half.
Strong lightning protection and anti-interference scenarios: For outdoor and mountain-deployed devices, standard power cables are highly prone to attracting lightning strikes, which often damage equipment during thunderstorms. In addition, in environments with extremely strong electromagnetic interference (EMI) such as power plants, steel mills, and high-speed railway corridors, data transmission over network cables and power lines frequently suffers from disconnection and packet loss. POF uses optical fiber transmission, which is completely non-conductive, will not attract lightning, is immune to all forms of electromagnetic interference, and delivers maximum stability.
POF does not transmit electric current through optical fiber: Optical fiber is made of insulating glass filaments and cannot conduct electric current. POF transmits laser energy, which is converted into DC power only at the remote end. This is the core reason for its zero electric shock and leakage risk, and its suitability for explosion-proof scenarios.
POF does not affect normal PON data transmission: The wavelength of the power supply laser used by POF is completely isolated from the wavelength used by PON service data. It does not occupy data bandwidth, nor does it affect the transmission quality of internet access and surveillance services.
POF is not a replacement for PoE, but a complementary technology: PoE is suitable for short-range indoor and campus scenarios within 100 meters with low cost. POF is designed for long-range scenarios of several kilometers, locations without mains power, and high-risk environments. The two technologies complement each other, rather than one replacing the other.
