Specifications and Models of Outdoor Flexible Optical Cables

Outdoor flexible optical cables are designed to withstand harsh environmental conditions while providing easy installation and high fiber density, with models including loose tube gel-free, gel-filled, and FlexibleTube (FT) designs.

Key Features of Outdoor Flexible Optical Cables

Environmental Resistance: Outdoor cables are engineered to endure UV exposure, temperature fluctuations (-40°C to +70°C), moisture, wind, rodents, and mechanical stress, which indoor cables cannot withstand. Flexibility: Flexible tube designs allow easy routing in tight ducts, closures, and aerial installations. They maintain fiber integrity during bending and mid-span access, making them suitable for both outdoor and limited indoor applications.

Water Protection: Loose tube cables may be gel-filled or gel-free. Gel-filled tubes block moisture and buffer thermal expansion, while gel-free designs use water-swellable materials for easy handling and maintenance without cleanup. Mechanical Strength: Many outdoor cables include central strength members (steel wire or FRP rods) and aramid yarn for tensile strength, supporting aerial, duct, or direct burial installations.

Dielectric Construction: All-dielectric self-supporting (ADSS) cables contain no metal, allowing installation on high-voltage lines without electrical interference.

Common Models and Specifications

Corning ALTOS® Loose Tube Gel-Free CableFiber Count: 48 fibersConstruction: SZ-stranded loose tube, all-dielectric, waterblockedJacket: Medium-density polyethylene (MDPE)Applications: Aerial lashed, duct installations, outdoor backbone networksFeatures: Flexible, craft-friendly buffer tubes, easy mid-span access, no bonding or grounding required FlexibleTube (FT) Cables by OptralFiber Count: High-density options availableConstruction: Flexible loose tubes suitable for indoor and outdoor useApplications: Marine, offshore, broadcasting, HD TV cameras, sensing, and monitoringCertifications: UL, Bureau Veritas, DNVFeatures: Compact, flexible, suitable for tight ducts and microducts, resistant to environmental stress GYTS (Gyta Type with Steel Wire Strength)Construction: Stranded loose tube with central steel wireApplications: Telecom backbone, metro access, FTTH feeder, long-distance transmissionInstallation: Duct, aerial with messenger, or direct burial with armorFeatures: Rugged, suitable for harsh outdoor environments ADSS (All-Dielectric Self-Supporting)Construction: No metal, reinforced with aramid yarn and FRP rodsApplications: Aerial installation on high-voltage power linesFeatures: Premium aerial cable, high tensile strength, electrically safe Selection ConsiderationsInstallation Environment: Choose gel-free for easy handling and maintenance, gel-filled for maximum moisture protection.

Fiber Count and Density: High-density cables are preferred for urban or retrofitted networks. Mechanical Load: Consider tensile strength, crush resistance, and wind load for aerial or exposed installations. Standards Compliance: Ensure compliance with IEC 60794 series for outdoor cable construction and environmental testing.

Outdoor flexible optical cables combine durability, flexibility, and high fiber capacity, making them ideal for modern telecom, data center, and industrial applications where environmental resilience and ease of installation are critical.