Optical Cable Tension Dispersion via Boundary Elongation
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Solution Overview
Problem
Existing optical cables concentrate tension on tension members, leading to the need for thick members, which increases the cable's thickness and limits the dispersion of tension to other components.
Innovation Solution
The optical cable design includes tension members with a boundary elongation smaller than optical fibers, allowing tension to be dispersed to other members by twisting the tension members in an S-Z configuration and housing them in a meandering manner within an outer sheath, reducing the diameter of the tension members and distributing tension more evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If tension members are disposed in a straight manner along the cable length direction, then tension applied to the optical cable concentrates on the tension members, but this requires thick tension members which makes the optical cable thick
Solution Approach 1:
The tension bearing function is segmented between multiple components: tension members provide primary tension resistance, while optical fibers and the outer sheath contribute additional tension bearing capacity. This segmentation allows thinner individual components while maintaining overall strength.
Solution Approach 2:
The optical cable employs a composite structure combining tension members (aramid yarn), optical fibers, and outer sheath materials with different mechanical properties. This composite approach distributes tension across materials with complementary characteristics, reducing the need for thick single-material tension members.
2Strength
If thick tension members are used to bear concentrated tension, then the optical cable becomes thick, but this limits the dispersion of tension to other components
Solution Approach 1:
Multiple components in the cable structure serve dual functions: the outer sheath provides both mechanical protection and tension bearing capacity, while optical fibers serve both light transmission and tension sensing functions. This multi-functionality reduces reliance on dedicated thick tension members.
3Adaptability or versatility
If the boundary elongation of tension members is larger than optical fibers, then tension disperses better, but this causes plastic deformation and breakage of tension members
Solution Approach 1:
The patent optimizes the boundary elongation parameter of tension members to be smaller than that of optical fibers. This parameter change ensures tension dispersion while preventing excessive deformation that would lead to plastic deformation or breakage, achieving both adaptability and 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 effectively reduces the diameter of the optical cable by dispersing tension to optical fibers and other components, inhibiting breakage and plastic deformation of tension members, while maintaining structural integrity and reducing transmission loss.
Implementation Method 1
the initial elongation region is a range of the cable elongation wherein, in case where the cable elongation occurs due to application of tension, a member, which is the tension member or the optical fiber, undergoes initial elongation due to the member deforming so as to approach a straight form along a cable length direction
Implementation Method 2
the elastic region is a range of the cable elongation wherein, in case where further cable elongation occurs beyond the initial elongation region, the member undergoes elastic elongation corresponding to an elastic modulus of the member
Data Source
AI summary
An optical cable includes one or more tension members, optical fibers disposed around an outer periphery of the one or more tension members, and an outer sheath housing the one or more tension members and the optical fibers. A boundary elongation of the one or more tension members is smaller than a boundary elongation of the optical fibers. The boundary elongation of the one or more tension members and the boundary elongation of the optical fibers is a cable elongation corresponding to a boundary between an initial elongation region and an elastic region.