Fiber Optic Cable With Elastomeric Buffer For Compression And Thermal Stress
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Solution Overview
Problem
Fiber optic cables are prone to stress-related failures due to compression and thermal expansion issues during installation, deployment, and handling, as conventional cables often compromise on one type of stress at the expense of another, leading to detrimental effects on optical fibers.
Innovation Solution
A fiber optic cable design featuring a central strength member with an elastomeric material positioned between the strength member and the optical fibers, providing protection against compression and thermal expansion, while a jacket offers environmental protection and structural support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fiber optic cables include stress management elements to reduce sensitivity to one type of stress, then that specific stress resistance is improved, but sensitivity to another type of stress increases due to engineering tradeoffs
Solution Approach 1:
The cable employs a composite structure combining elastomeric material (polymer) with strength members (steel or aramid fibers). This composite design allows the cable to simultaneously achieve compression resistance from the elastomer and tensile strength from the strength members, while the elastomer's flexibility compensates for thermal expansion effects, resolving the tradeoff between different stress types.
Solution Approach 2:
The elastomeric material's physical parameters (viscoelastic properties, coefficient of thermal expansion) are specifically selected to match or compensate for the optical fiber's characteristics. The material's ability to deform elastically under compression and thermally expands/contracts at controlled rates allows the cable to maintain fiber stress within safe limits across varying installation and environmental conditions.
2Force
If the cable structure is designed to resist compression forces during installation and handling, then compression resistance is improved, but thermal expansion and contraction stresses increase
Solution Approach 1:
The elastomeric material is specifically selected for its coefficient of thermal expansion, which is designed to match or compensate for the optical fiber's thermal expansion characteristics. This ensures that when temperature changes cause the cable structure to expand or contract, the elastomer's dimensional changes counterbalance these effects, preventing stress concentration on the fiber while maintaining compression resistance.
Solution Approach 2:
The elastomeric material serves as an intermediary element between the strength members and the optical fiber. It absorbs and distributes compression forces during installation while its thermal properties mediate the effects of temperature changes, preventing direct transmission of thermal stress to the fiber.
3Strength
If strength members are added to increase pull strength, then tensile strength is improved, but compression and thermal stresses become more problematic
Solution Approach 1:
The cable uses a composite construction where aramid fibers or steel wires (strength members) provide tensile strength, while elastomeric material provides compression resistance and thermal compensation. The elastomer surrounds and protects the optical fiber from compression forces, while the strength members handle tensile loads, creating a balanced protection against different stress types without the tradeoffs of conventional designs.
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 solution effectively mitigates stress on optical fibers, enhancing their resilience to compression and thermal expansion, thereby promoting robust installations and reliable communication applications.
Implementation Method 1
An elastomeric material can be positioned between the optical fibers and the strength member
Implementation Method 2
lateral compression on an optical fiber can cause light to leak out of the core
Implementation Method 3
Temperature fluctuations in the operating environment of the cable pose another source of stress. The various elements in the fiber optic cable typically expand and contract at different rates when temperature of the cable changes
Data Source
AI summary
A fiber optic cable can comprise technology for mitigating stress on optical fibers of the cable. The technology can protect the optical fibers from compression, such as stemming from installation, deployment, or handling. The technology can compensate for thermally induced expansion and contraction of cable elements having differing thermal expansion characteristics, arising when the cable is subjected to temperature variations. The cable can comprise a central strength member onto which an elastomeric material, such as silicone, has been applied. The elastomeric material can protect optical fibers that are located between the central strength member and an outside jacket.