How far can a China Unicom fiber optic router be distributed

China Unicom fiber optic routers can typically distribute signals effectively up to several kilometers over fiber, with indoor FTTR deployments extending coverage to individual rooms.Fiber Optic Transmission DistanceThe effective distribution of a China Unicom fiber optic router depends on the type of fiber and network technology used. Standard G.652 single-mode fiber used in China Unicom's networks can support long-distance transmission, often tens of kilometers without signal regeneration, especially when combined with technologies like EDFA amplification and DWDM (Dense Wavelength Division Multiplexing) for high-capacity links . For example, China Unicom has successfully tested 800G transmission over 690 km on live networks, demonstrating the robustness of their fiber infrastructure for long-distance interconnections .Residential and Enterprise DeploymentFor home and office environments, China Unicom uses FTTR (Fiber to the Room) and 10G PON technologies. In these setups, a central ONT (Optical Network Terminal) distributes fiber signals to multiple rooms or endpoints within a building. The indoor distribution is typically limited to the building's internal wiring, which can range from tens to hundreds of meters, depending on the quality of fiber and the use of subtended ONTs or access points . This ensures high-speed, low-latency connections in each room while maintaining the advertised bandwidth.Factors Affecting DistributionFiber Type and Quality: Single-mode fibers (G.652) allow longer distances than multimode fibers.Amplification and Modulation: Technologies like EDFA amplification and 16QAM modulation improve signal reach and quality .Network Architecture: Dense urban deployments may use DWDM to split signals across multiple wavelengths, increasing capacity without reducing distance .Indoor Wiring: For FTTR, the distance from the central ONT to each room is usually limited to 100–200 meters, ensuring stable high-speed access .Practical SummaryLong-haul backbone: Tens to hundreds of kilometers using single-mode fiber with amplification.Metro and inter-building links: Several kilometers, often up to 10–20 km without repeaters.Indoor FTTR distribution: Typically within a single building, up to 100–200 meters per room, using subtended ONTs for full coverage . In conclusion, China Unicom fiber optic routers are capable of long-distance backbone transmission for inter-city or data center connections, while residential FTTR deployments focus on distributing high-speed fiber signals efficiently within homes or buildings. The exact range depends on fiber type, network technology, and deployment scenario.