Flat Drop Cable With Offset Strength Member
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Solution Overview
Problem
Conventional fiber optic drop cables are stiff and inflexible, making them difficult to handle and expensive to manufacture, due to their robust construction.
Innovation Solution
A fiber optic cable design featuring an outer jacket with an elongated transverse cross-sectional profile and separate passages for optical fibers and a tensile strength member, where the tensile strength member is highly flexible and offset from the center, allowing for improved flexibility and reduced manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If reinforcing members such as glass reinforced epoxy rods are embedded in the jacket to provide mechanical reinforcement, then the cable becomes robust and strong, but the cable becomes stiff, inflexible and difficult to handle
Solution Approach 1:
The patent applies local quality by positioning reinforcing members only at specific locations within the cable structure rather than uniformly throughout. The flat cable construction with reinforcing members embedded in the jacket at strategic positions provides mechanical strength where needed while maintaining flexibility in other areas, resolving the contradiction between robustness and handleability.
2Reliability
If a robust construction with reinforcing members is used, then the cable can withstand installation stresses, but the manufacturing cost increases
Solution Approach 1:
The patent segments the cable construction into distinct functional components: a flat cable body with embedded reinforcing members, separate buffer tubes for optical fibers, and an outer jacket. This segmentation allows for optimized manufacturing of each component independently and simplifies the assembly process, reducing overall manufacturing complexity and cost while maintaining the reliability needed to withstand installation stresses.
3Shape
If a flat transverse profile with embedded reinforcing members is used, then the cable structure is robust, but the cable is expensive to manufacture
Solution Approach 1:
The patent merges multiple functions into the outer jacket structure: it provides mechanical protection, houses embedded reinforcing members for strength, and contains buffer tubes for fiber protection. This integration reduces the number of separate components needed, simplifies the manufacturing process, and lowers production costs while maintaining the robust flat profile structure.
Data Source
AI summary
An example fiber optic cable includes an outer jacket having an elongated transverse cross-sectional profile defining a major axis and a minor axis. The transverse cross-sectional profile has a maximum width that extends along the major axis and a maximum thickness that extends along the minor axis. The maximum width of the transverse cross-sectional profile is longer than the maximum thickness of the transverse cross-sectional profile. The outer jacket also defines first and second separate passages that extend through the outer jacket along a lengthwise axis of the outer jacket. The second passage has a transverse cross-sectional profile that is elongated in an orientation extending along the major axis of the outer jacket. The fiber optic cable also includes a plurality of optical fibers positioned within the first passage a tensile strength member positioned within the second passage.