Optical Fiber Cable Water-Blocking Bands for Low-Attenuation Density
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Solution Overview
Problem
Conventional optical fiber cables with high fiber densities face issues of attenuation due to limited free space, and existing water-blocking materials are not suitable for low free space environments, leading to ineffective water management.
Innovation Solution
The implementation of intermittently spaced bands of water-blocking material along optical fibers within subunits, which absorb at least 20 grams of water per gram, allowing for reduced material usage and effective water absorption while maintaining high fiber density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional water-blocking powders or yarns are used in high fiber density cables, then water blocking is achieved, but fiber movement freedom is restricted causing attenuation
Solution Approach 1:
The water-blocking material is applied as intermittently spaced bands rather than continuous coverage, dividing the blocking function into discrete segments that allow fiber movement in non-banded regions while maintaining water blocking at specific intervals
Solution Approach 2:
Water-blocking material is applied selectively at specific locations along the optical fiber rather than uniformly, creating local water blocking zones that provide adequate protection while leaving other regions open for fiber movement and flexibility
2Productivity
If more optical fibers are included in the cable, then data capacity increases, but free space for fiber movement decreases causing attenuation
Solution Approach 1:
By segmenting the water-blocking function into intermittent bands, the cable structure accommodates higher fiber density while preserving movement freedom in the spaces between bands, allowing more fibers to be packed without proportionally increasing attenuation risk
3Reliability
If continuous water-blocking material is applied to optical fibers, then water blocking is maximized, but material usage and cable complexity increase
Solution Approach 1:
The water-blocking function is extracted from continuous coverage and applied only where needed as intermittent bands, removing unnecessary material and simplifying the cable structure while maintaining adequate water blocking performance
Solution Approach 2:
Instead of applying water-blocking material excessively throughout the entire fiber length, partial action is taken by applying material only at specific intervals, achieving sufficient water blocking with reduced material usage and simpler structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach minimizes water ingress, reduces attenuation, and maintains cable flexibility and burn performance by using less water-blocking material, enabling efficient water management in high-density optical fiber cables.
Implementation Method 1
The water-blocking material configured to absorb at least 20 grams of water per gram of water-blocking material
Implementation Method 2
bands of water-blocking material that are intermittently spaced along a length of the at least one optical fiber
Data Source
AI summary
An optical fiber cable is provided. The optical fiber cable includes a cable jacket having an inner surface and an outer surface. The inner surface defines a central bore, and the outer surface defines an outermost surface of the optical fiber cable. At least one subunit is disposed within the central bore, and each of the at least one subunit includes a subunit jacket surrounding a plurality of optical fibers. At least one optical fiber of the plurality of optical fibers in each of the at least one subunit includes bands of water-blocking material that are intermittently spaced along a length of the at least one optical fiber. The water-blocking material is configured to absorb at least 20 grams of water per gram of water-blocking material.