High Density Optical Cables With Deformable Buffer Tubes
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Solution Overview
Problem
Conventional optical cables face challenges in achieving high data transfer rates while minimizing space, due to their sensitivity to bending and compressive stresses, and the limitations of existing duct sizes.
Innovation Solution
The development of optical cables with deformable buffer tubes and a deformable upjacket, which allow for a more compact and flexible arrangement of optical fibers, reducing void spaces and enhancing packing density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional optical cables are used to achieve high data transfer rates, then data transmission capability is improved, but cable size and space requirements increase
Solution Approach 1:
The patent implements nested buffer tubes within buffer tubes, where smaller diameter buffer tubes are positioned inside larger diameter buffer tubes. This nesting arrangement allows multiple optical fiber bundles to be contained within a compact hierarchical structure, significantly reducing the overall cable diameter while maintaining high data transfer capacity through multiple fiber pathways.
Solution Approach 2:
The patent transitions from conventional two-dimensional side-by-side buffer tube arrangements to a three-dimensional nested configuration. By utilizing radial and axial dimensions simultaneously, the design packs more optical fibers into a smaller volume, achieving higher density without increasing the cable's outer dimensions.
2Adaptability or versatility
If conventional optical cables are installed through existing ducts, then installation is possible, but duct size limitations prevent high-density cable deployment
Solution Approach 1:
The nested buffer tube configuration reduces the overall cable cross-sectional area, enabling the cable to fit through existing ducts with limited dimensions. The hierarchical nesting of smaller tubes within larger tubes maximizes space utilization and minimizes the external footprint of the cable.
Solution Approach 2:
The patent employs buffer tubes with different diameter parameters arranged in a nested sequence, optimizing the space utilization within the cable structure. This parameter optimization allows the cable to achieve high fiber density while maintaining a compact outer diameter suitable for existing duct infrastructure.
3Ease of operation
If conventional optical fibers are subjected to compressive stress during installation, then cable installation is possible, but fiber performance and reliability deteriorate
Solution Approach 1:
The patent implements a hierarchical buffer tube structure with multiple protective layers and stress-distributing configurations. The nested buffer tubes provide progressive cushioning against compressive stresses, preventing direct transmission of installation forces to the optical fibers. This beforehand protection mechanism maintains fiber reliability during installation and service.
Solution Approach 2:
The buffer tubes are designed with flexible materials and wall thicknesses that provide mechanical protection while allowing controlled deformation. This flexibility enables the cable to withstand installation stresses without transmitting damaging forces to the optical fibers, maintaining both installability and long-term reliability.
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 design achieves a higher packing density of optical fibers, improving data transfer capabilities while maintaining structural and optical integrity, and allowing the cables to pass through smaller ducts.
Implementation Method 1
The buffer tube jacket includes a first deformable material that is deformed plastically
Data Source
AI summary
An optical cable includes a plurality of buffer tubes and an outer jacket surrounding the plurality of buffer tubes. Each of the plurality of buffer tubes includes a buffer tube jacket surrounding a plurality of flexible ribbons. The buffer tube jacket includes a first deformable material that has undergone deformation during formation of the optical cable to conform to an irregular axial cross-sectional shape of each respective plurality of flexible ribbons. Each flexible ribbon includes a plurality of optical fibers and a first longitudinal length. For each flexible ribbon, each optical fiber of the plurality of optical fibers is attached to an adjacent optical fiber of the plurality of optical fibers along a bond region comprising a second longitudinal length that is less than the first longitudinal length. The cable has a fiber density between about 5.0 and about 10 fibers/mm2.