Auxiliary materials in optical cables include coatings, strengthening fibers, jackets, armoring, water-blocking elements, and identification components, all essential for protection, durability, and s...
Fiber cores are coated with dual-layer UV-cured acrylate, consisting of a soft primary layer and a hard secondary layer. This coating protects the delicate glass from mechanical stress, bending, and micro-cracks, ensuring minimal signal loss during handling and installation. High-temperature applications may use polyimide coatings, which provide heat resistance for aerospace or industrial environments .
To prevent fiber stretching and enhance mechanical resilience, optical cables incorporate strengthening fibers such as aramid yarn (Kevlar) or FRP (fiber-reinforced plastic) rods. These materials absorb tensile forces during installation and operation, maintaining the integrity of the optical path .
The outer jacket shields the cable from environmental hazards like moisture, UV radiation, and chemical exposure. Common materials include HDPE (high-density polyethylene) for outdoor use and LSZH (low-smoke zero-halogen) for indoor applications. Jackets are selected based on fire codes, temperature ratings, and installation conditions .
For additional protection, especially in harsh outdoor or underground environments, cables may include steel armoring or metallic components. These provide mechanical protection, grounding, and chemical insulation. Some designs also use glass flakes, borate, or specialized chemical repellents to enhance durability .
To prevent water ingress, optical cables may include gel-filled tubes, dry core water-blocking materials, or water-swellable tapes. These elements protect the fiber from moisture-induced attenuation and corrosion, extending the cable's operational lifespan .
For multi-fiber cables, UV-cured color inks are used to identify individual fibers, while UV-curable resin matrices organize fibers in ribbon cables. These materials facilitate installation, splicing, and maintenance .
Auxiliary materials in optical cables are critical for mechanical strength, environmental protection, and long-term performance. Proper selection of coatings, strengthening fibers, jackets, armoring, and water-blocking elements ensures reliable data transmission, reduces maintenance costs, and extends the cable's service life .
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