| 摘要 |
Multiple groups of optical fibers are laid in concentric helical layers around a central core. A first layer is wound or laid around the core with adjacent lap segments touching each other, thus eliminating axial spacing between the lap segments along the core. The next group contains a greater number of optical fibers and is helically laid around the first layer, with adjacent lap segments touching each other. This winding process is continued, with the number of optical fibers in each successive winding group progressively increasing until a desired cable diameter is obtained. Improved surface uniformity is provided by laying the helical layers with a reversed direction of lay and with increased length of lay in each successive layer. According to another arrangement, improved luminosity is provided by laying the helical layers with reversed direction of lay and with the same length of lay in each successive layer. Additionally, a tighter (relatively dense) packing of fiber is provided by laying the helical layers with the same direction of lay and with the same length of lay for each successive layer.
|
