A composite optical cable typically contains one or more optical fibers housed within protective layers. The fibers are usually single-mode or multimode glass cores, designed for low-loss, high-speed data transmission . Surrounding the fibers are buffer layers that protect against mechanical stress, moisture, and crushing forces. In loose tube designs, fibers can move slightly within the tube, often filled with gel or lubricants to reduce friction and accommodate thermal expansion .
Composite cables include strength members such as steel wires, aramid yarns, or aluminum layers to bear tensile loads and prevent fiber stretching . In overhead applications like Optical Ground Wire (OPGW), the cable combines optical fibers with steel and aluminum conductors, providing both grounding and data transmission capabilities . Submarine composite cables also use helically wound optical units with slight fiber excess length to maintain low-loss transmission under mechanical stress .
The outer layers of composite optical cables are designed for environmental resistance, including protection from UV, moisture, and temperature variations. Jackets may be made of polyethylene or other durable polymers, and additional layers like ripcords facilitate installation and maintenance . In submarine cables, fiber grease or lubricants allow fibers to slide within the optical unit, enhancing adaptability to external mechanical disturbances .
Composite optical cables are widely used in telecommunications, power transmission, and offshore energy systems. OPGW cables integrate grounding and communication for high-voltage lines, while submarine composite cables ensure reliable long-distance data transmission under harsh marine conditions . In summary, composite optical cable structures are engineered to balance optical performance, mechanical strength, and environmental durability, making them suitable for diverse and demanding applications.
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