FTTH duct-type optical cables are specialized fiber optic cables designed for underground duct installation, providing high-speed broadband connectivity directly to homes with robust protection and easy maintenance.

Overview

FTTH (Fiber-to-the-Home) duct-type optical cables are engineered to be installed inside pre-existing underground ducts or conduits, rather than being buried directly in soil or mounted on poles . These cables form the backbone of modern broadband networks, enabling high-speed internet, IPTV, and telecommunication services directly to residential users . The duct provides mechanical protection, shields the fiber from environmental hazards, and allows for easier maintenance or future upgrades.

Cable Construction

• Loose-Tube Design: Optical fibers are housed in gel-filled or dry water-blocking tubes, which protect against moisture, vibration, and mechanical stress .
• Central Strength Member: Typically made of FRP (Fiberglass Reinforced Plastic) or steel, providing tensile strength and structural stability .
• Outer Sheath: HDPE or LSZH + PE sheaths offer resistance to abrasion, chemicals, UV radiation, and flame, ensuring long-term durability in underground ducts .
• Water Blocking: Many cables include water-blocking yarns or particles to prevent moisture ingress and extend cable life .

Fiber Types and Counts

Duct-type FTTH cables are available in single-mode and multi-mode variants, supporting high-capacity networks including 10 Gbps, 40 Gbps, and 100 Gbps systems . Fiber counts range from 2 to 288 cores, accommodating small residential deployments to high-density metropolitan backbones . Single-mode fibers are preferred for long-distance and high-speed FTTH applications due to minimal signal loss .

Installation Advantages

• Smooth-Jacketed Design: Facilitates easy pulling or blowing through ducts, reducing mechanical stress and installation time .
• Compatibility: Works with standard duct installation techniques, including jetting, blowing, and pulling .
• Maintenance: Duct installation allows for easier access for repairs or upgrades without extensive excavation .

Applications

• FTTH Networks: Direct connection to homes for high-speed broadband .
• Metropolitan Area Networks (MANs): Backbone connections in urban areas .
• Campus and Data Center Interconnections: High-capacity links between buildings or facilities .

Summary

FTTH duct-type optical cables combine mechanical protection, environmental resistance, and high-performance fiber transmission in a compact, duct-compatible design. They are ideal for underground deployments in urban and suburban areas, ensuring reliable, high-speed connectivity while simplifying installation and maintenance .