Method of Winding Power Optical Cables

Power optical cables are wound using controlled tension, reverse-twist techniques, and precision bobbin systems to minimize stress and ensure uniform winding.

Reverse-Twist Winding Technique

One common method involves winding the optical cable on a spool or aerial wire while applying a reverse twist to counteract the cable's preset twist. This reduces twisting stress and prevents damage to the fiber during installation. Typically, the cable has a twist every 30–60 cm, and winding in the opposite direction of this preset twist ensures the stress on the cable is minimized, maintaining its structural integrity and optical performance .

Bobbin and Traverse Mechanisms

Optical fibers are often wound on bobbin systems, which may be tapered or cylindrical. A traverse mechanism moves the bobbin axially to distribute the fiber evenly across the spool. This prevents overlapping, dropping, or winding-over phenomena, which can damage the fiber or create uneven tension . High-precision systems can reverse the bobbin movement near flanges to maintain a consistent winding state.

Tension Control and High-Precision Winding

Maintaining precise tension is critical for optical cables. Advanced winding systems use belt haul-offs, dancer accumulators, and tension controllers to decouple unwinding and rewinding processes. This ensures the fiber is kept at the correct length and tension, which is especially important for sensitive applications like Fibre Bragg Gratings or high-speed power optical cables . Positioning accuracy can reach steps as small as 10 µm, allowing bidirectional coil winding to exact positions.

Industrial Winding Equipment

Modern winding machines, such as those from Rosendahl Nextrom, are designed for fast, maintenance-friendly handling and can accommodate a wide range of cable sizes and weights. They include PLC-controlled touch terminals, protective grids, and double spoolers for high-speed processes up to 1,500 m/min with reels up to 2,500 kg . These machines ensure stability from start to finish and can be customized for specific production requirements.

Standards and Best Practices

Following ITU-T recommendations and industry standards ensures optimal performance. For example, single-mode fibers should comply with ITU-T G.652 specifications, and proper winding techniques help maintain low attenuation and minimal dispersion over long distances . Proper handling, controlled tension, and precise winding are essential to prevent microbending or macrobending losses in power optical cables. In summary, effective winding of power optical cables combines reverse-twist techniques, precision bobbin traversal, tension control, and high-quality industrial winding equipment to ensure cable integrity, performance, and longevity.