Optical Fiber Cable Jacket Access Feature for Cold-Resistant Tearing
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Solution Overview
Problem
Conventional optical fiber cables face issues with access features that either weaken the cable jacket or fail under extreme cold conditions due to adhesive bonding failures between the access features and the cable jacket, leading to undesired breaks and reduced robustness.
Innovation Solution
The optical fiber cable design incorporates access features made of a polymeric material with a lower tensile strength than the cable jacket, ensuring cohesive bonding failure rather than adhesive failure, thereby maintaining structural integrity and facilitating easy access to the cable core.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If access features are embedded in the cable jacket, then access to the cable core is facilitated, but the cable jacket strength is weakened
Solution Approach 1:
The access features are made of a polymeric material with different properties than the cable jacket material. Specifically, the access feature material has lower tensile strength and higher elongation at break, creating localized weak points that facilitate tearing while the rest of the cable jacket maintains its full strength for protection and load-bearing.
Solution Approach 2:
The access features are embedded as discrete, separated elements within the cable jacket rather than being integrated throughout. These segmented access features create controlled weak points at specific locations, allowing the cable to be opened at desired points without compromising the overall structural integrity of the jacket.
2Reliability
If access features are made of polymeric material with lower tensile strength, then cohesive bonding failure occurs instead of adhesive failure, but adhesion to cable jacket must be maintained
Solution Approach 1:
The tensile strength and elongation properties of the access feature material are specifically adjusted to be lower than the cable jacket material. This parameter change ensures that under stress, the access features fail cohesively (the material itself tears) rather than adhesively (separating from the jacket), providing reliable and clean access points.
Solution Approach 2:
The cable construction uses a composite of two different polymeric materials: one for the cable jacket and another for the embedded access features. The jacket material has higher tensile strength and lower elongation, while the access feature material has lower tensile strength and higher elongation, creating a functional composite structure with differentiated failure modes.
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
The design provides robustness under tensile loads and extreme cold conditions while allowing easy access to the cable core without additional tools, enhancing the cable's durability and flexibility.
Implementation Method 1
An adhesive bonding strength between the first polymeric material and the second polymeric material is stronger than a cohesive bonding strength within the first polymeric material so that a longitudinal tear made to access the cable will propagate through the at least one access feature
Data Source
AI summary
Embodiments of the disclosure relate to an optical fiber cable. The optical fiber cable includes a cable jacket having an interior surface and an exterior surface. The interior surface defines a central bore extending along a longitudinal axis of the optical fiber cable, and the exterior surface defines an outermost surface of the optical fiber cable. The optical fiber cable also includes a cable core including at least one optical fiber disposed within the central bore of the cable jacket. The cable jacket includes at least one access feature made of a first polymeric material disposed between the interior surface and the exterior surface. The first polymeric material has a first tensile strength (TS1). Each of the at least one access feature is surrounded by a second polymeric material of the cable jacket. The second polymeric material has a second tensile strength (TS2). TS1≤(⅔)*TS2.