Fiber Optic Cable Assembly with Overlapping Bundled Strength Members
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Solution Overview
Problem
Conventional fiber optic cable assemblies with fusion splices and strength members are bulky due to the need for a housing cavity filled with epoxy, which is time-consuming and costly, and do not support high fiber density due to the limitations of one-dimensional array splice protection technology.
Innovation Solution
A fiber optic cable assembly design where strength members from two cable sections are bundled and adhered in an overlapping manner without a housing cavity, with a polymeric overcoating applied to the splice joints, allowing direct mechanical coupling and reducing the need for epoxy, and utilizing a thermoplastic coating apparatus for applying material over components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a housing cavity filled with epoxy is used to protect fusion splices and couple strength members, then mechanical protection and coupling are achieved, but the cable assembly becomes bulky and fabrication becomes time-consuming and costly
Solution Approach 1:
The patent removes the housing cavity and epoxy from the cable assembly design. Instead of enclosing splices in a separate housing filled with epoxy, the strength members themselves are bundled and adhered directly together to provide mechanical protection and coupling, eliminating the need for the bulky housing structure while maintaining splice protection
Solution Approach 2:
The patent combines the functions of mechanical protection and strength member coupling into a single integrated structure. The bundled and adhered strength members serve both as structural support elements and as the protective mechanism for splices, merging what were previously separate functions (housing protection and strength member coupling) into one unified approach
2Strength
If a housing cavity filled with epoxy is used to protect fusion splices, then mechanical coupling is achieved, but fabrication becomes time-consuming and costly
Solution Approach 1:
The patent extracts the time-consuming epoxy filling and curing process from the fabrication sequence. By using pre-formed bundled strength members that are directly adhered together, the design eliminates the need for injecting epoxy into housing cavities and waiting for curing, significantly reducing fabrication time and cost while maintaining mechanical coupling strength
Solution Approach 2:
The strength members are bundled and prepared in advance before the final assembly. The bundled sections are pre-formed with adhesive already in place, allowing for rapid assembly without requiring on-site epoxy injection and curing operations, thus improving productivity
3Reliability
If one-dimensional array splice protection technology is used, then splice protection is achieved, but high fiber density is not supported
Solution Approach 1:
The patent transitions from one-dimensional array protection to a three-dimensional bundled structure. By arranging strength members in overlapping bundled sections that wrap around and adhere to splice regions, the design provides protection in multiple spatial dimensions, enabling support for higher fiber densities that cannot be accommodated by linear one-dimensional protection methods
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 reduces the size and complexity of the cable assembly, enhances mechanical coupling, and supports higher fiber density by eliminating the need for epoxy and allowing for more efficient fabrication and protection of the splice regions.
Implementation Method 1
a trough for containing molten thermoplastic material arranged above a heated working surface
Implementation Method 2
The apparatus may be used for applying thermoplastic material over strength members to form bundled sections of strength members, for applying thermoplastic material over fusion splice regions
Data Source
AI summary
A fiber optic cable assembly includes first and second cable sections each having a jacket, at least one optical fiber, and multiple strength members. An intermediate cable section includes at least one splice joint as well as bundled sections of strength members of the cable sections formed into bundled sections that overlap and are adhered together. As adhered, the bundled strength members are shorter than the at least one spliced optical fiber in the intermediate section to ensure that the strength members bear tensile loads. A fabrication method includes binding unjacketed segments of strength members of two cable sections into bundled sections of strength members, fusion splicing ends of optical fibers, polymerically overcoating at least one splice joint, and adhering the bundled sections of strength members in an overlapping arrangement. An apparatus for thermoplastically coating cable assembly portions includes a trough for molten thermoplastic material, and a lateral insertion slot defined therein.