High-Density Optical Fiber Cable Structure Against Lateral Pressure
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Solution Overview
Problem
Existing optical fiber cables face challenges in achieving high density fiber mounting and lateral pressure resistance, leading to potential collapse or kinking under applied stress.
Innovation Solution
The optical fiber cable design includes multiple optical fiber ribbons with connected and non-connected portions, a sheath with a specific inner-to-outer diameter ratio, and a high fiber count, along with tension members and lids to enhance density and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of optical fibers is increased to 3000 or more, then the fiber mounting density is improved, but the cable structure becomes more complex and more prone to collapse or kinking under lateral pressure
Solution Approach 1:
The optical fiber cable is divided into multiple optical fiber ribbons, each containing a specific number of optical fibers arranged in parallel. This segmentation allows the large number of fibers (3000 or more) to be organized into manageable units that are less susceptible to collapse or kinking under lateral pressure, while still achieving high mounting density.
Solution Approach 2:
The cable employs a composite structure combining multiple optical fiber ribbons with a sheath having a specific inner-to-outer diameter ratio (0.75 or more). This composite design provides both the capacity to accommodate 3000+ fibers and the structural integrity to resist lateral pressure, preventing collapse or kinking.
2Quantity of substance
If the sheath inner-to-outer diameter ratio is increased to 0.75 or more, then the fiber mounting density is improved, but the sheath wall thickness is reduced, potentially compromising structural strength
Solution Approach 1:
Instead of using a single thick-walled sheath, the design segments the fiber containment into multiple optical fiber ribbons within a larger sheath structure. This allows the sheath to have a high inner-to-outer diameter ratio (0.75 or more) for improved fiber density while the segmented ribbon structure provides internal support that compensates for the thinner sheath walls.
3Area of stationary object
If the outer diameter of the sheath is reduced to 50 mm or less, then the cable size is minimized, but the space for accommodating 3000 or more optical fibers becomes more constrained
Solution Approach 1:
The optical fibers are arranged in a three-dimensional configuration using multiple optical fiber ribbons stacked and twisted together within the sheath. This dimensional approach allows 3000 or more fibers to be accommodated in a compact outer diameter of 50 mm or less by utilizing vertical stacking and radial arrangement rather than simple linear packing.
Solution Approach 2:
Multiple optical fiber ribbons are nested within each other in a compact arrangement, with each ribbon containing multiple fibers. This nested structure maximizes the use of available space within the 50 mm outer diameter constraint while accommodating the required 3000+ fibers through hierarchical organization.
Data Source
AI summary
An optical fiber cable includes optical fiber ribbons and a sheath covering a periphery of the plurality of optical fiber ribbons. Each of the optical fiber ribbon includes optical fibers, and a connected portion and a non-connected portion are intermittently provided in the longitudinal direction. Each optical fiber includes a glass fiber and a coating portion. A ratio of an inner diameter to an outer diameter of the sheath is 0.75 or more. A ratio of a total area of glasses in an optical fiber ribbon accommodating portion to an area of the optical fiber ribbon accommodating portion is 15% or more and 25% or less, the number of the optical fibers in the optical fiber cable is 3000 or more, and the outer diameter of the sheath is 50 mm or less.