Specifications of 4-core single-mode outdoor optical fiber

A 4-core single-mode outdoor optical fiber cable typically features four high-purity silica fibers in a robust, water-blocked, UV-resistant jacket suitable for long-distance outdoor installations.Core and Fiber TypeThe cable contains four single-mode fibers, usually made of high-purity silica with germanium-doped cores for low attenuation and high bandwidth over long distances . Each fiber is coated with a UV-curable acrylate primary protective layer to prevent microbending and physical damage . Single-mode fibers are optimized for long-distance telecommunication and FTTH/GPON applications .Cable ConstructionLoose Tube or PBT Tube: Fibers are housed in a gel-filled or dry loose tube (PBT) to protect against moisture and mechanical stress .Strength Members: Aramid yarn (Kevlar) or FRP rods provide tensile strength and prevent stretching during installation . Steel messenger wires may be included in aerial or Siamese designs for additional support .Outer Jacket: Polyethylene (PE) is commonly used for outdoor UV and moisture resistance, while some designs include LSZH for fire safety in mixed environments .Environmental and Mechanical ProtectionWater-blocking: Gel or water-swellable materials prevent water ingress .UV Resistance: Ensures durability under prolonged sunlight exposure .Temperature and Weather Tolerance: Suitable for direct burial, duct, or aerial installation, maintaining performance in harsh outdoor conditions .Performance CharacteristicsLow Attenuation: Single-mode fibers maintain signal integrity over long distances.High Bandwidth: Supports high-speed data transmission for telecom networks.Redundancy Options: 4-core design allows for two duplex links or one duplex link with two backup fibers .Testing and StandardsOTDR Testing: Each cable is tested for splice loss, length, and faults using Optical Time Domain Reflectometry .Compliance: Adheres to ISO9001:2015, IEC standards, and European quality inspection standards .Typical ApplicationsFTTH/GPON networks connecting end-users.Long-distance telecommunication links.Outdoor installations requiring durability and environmental resistance. This combination of high-quality single-mode fibers, robust mechanical protection, and environmental resistance makes 4-core outdoor optical fiber cables ideal for reliable, long-term communication infrastructure .