Optical Fiber Cable Intermittent Ribbon Coupling
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Solution Overview
Problem
Existing optical fiber cables face challenges in achieving high-density packing of fibers while maintaining distinguishability and preventing transmission characteristic deterioration, particularly in slot-type multicore cables.
Innovation Solution
The optical fiber cable design incorporates intermittently coupled optical fiber ribbons with coupling and non-coupling portions, accommodated in slot grooves within a slot rod, allowing for high-density packing without compromising transmission characteristics, and features a cable sheath to cover the slot rod, with sub-units stranded and wound with a bundle material for improved distinguishability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If optical fiber ribbons are fully coupled in the longitudinal direction, then structural stability is improved, but transmission characteristics deteriorate due to excessive strain
Solution Approach 1:
The optical fiber ribbon is segmented into multiple coupling portions along its longitudinal direction, with non-coupling portions between them. This segmentation allows different sections to have different coupling states, preventing excessive strain accumulation while maintaining structural stability in coupled regions.
Solution Approach 2:
Different sections of the optical fiber ribbon have different coupling characteristics - some portions are coupled to provide structural stability, while other portions remain non-coupled to prevent strain-induced transmission deterioration. This local differentiation optimizes both structural and transmission performance.
2Quantity of substance
If the number of optical fibers per slot groove is increased to 100 or more, then fiber density is improved, but cable outer diameter increases beyond 35 mm
Solution Approach 1:
Multiple optical fiber ribbons are nested within a single slot groove, with each ribbon containing multiple optical fibers arranged in parallel. This nesting arrangement allows 100 or more fibers to be accommodated in one slot groove while maintaining a compact cable outer diameter of 35 mm or less.
Solution Approach 2:
Optical fibers are arranged in a two-dimensional ribbon structure rather than simple linear arrangement, allowing multiple fibers to be packed efficiently in the transverse direction while accommodating many such ribbons in the longitudinal direction within the slot groove.
3Ease of operation
If slot rod structure is used to accommodate optical fiber ribbons, then distinguishability is improved, but device complexity increases
Solution Approach 1:
The slot rod is divided into multiple slot grooves, with each groove accommodating specific optical fiber ribbons. This segmentation provides clear spatial separation and distinguishability for different fiber groups while maintaining a relatively simple overall rod structure.
Data Source
AI summary
An optical fiber cable comprises optical units having a plurality of optical fiber ribbons, a slot rod having a plurality of slot grooves in which the optical units are accommodated, and a cable sheath configured to cover an outer side of the slot rod, each of the optical fiber ribbons is intermittently provided with coupling portions, at which adjacent optical fibers are coupled therebetween, and non-coupling portions, at which adjacent optical fibers are not coupled therebetween, in a longitudinal direction between a part or all of the optical fibers in a state where the plurality of optical fibers is arranged in parallel, and an outer diameter of the optical fiber cable is 35 mm or less and a number of the optical fibers in the optical unit accommodated in one slot groove is 100 or more.