Optical Cable Pistoning Reduction via Reinforcement Carrier
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Solution Overview
Problem
Optical cables with flexible tubes, or 'micro-bundles,' experience significant 'pistoning' effects due to temperature variations and external stresses, leading to signal quality issues and increased costs in existing solutions, particularly for cables longer than 200 meters.
Innovation Solution
An optical cable installation with a central mechanical reinforcement carrier fixed to an optical connection box, utilizing micro-tubes with specific material properties and wrapping forces to limit longitudinal displacement and reduce pistoning, eliminating the need for additional reinforcement or coiling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If flexible tubes (micro-bundles) are used to surround optical fibers, then the cable maintains flexibility and ease of handling, but the pistoning effect increases significantly under temperature variations and external stresses
Solution Approach 1:
A gel substance is introduced as an intermediary material between the optical fibers and the flexible micro-bundle tube. This gel fills the annular space and provides mechanical coupling that prevents relative longitudinal displacement (pistoning) between the fibers and the tube, while maintaining the flexibility and ease of handling provided by the micro-bundle structure. The gel acts as a mediator that transmits forces uniformly to prevent fiber stress during temperature variations and external loading.
2Reliability
If rigid tubes are used to protect optical fibers, then the pistoning effect is reduced, but the cable loses flexibility and requires tools for stripping
Solution Approach 1:
The patent employs a composite structure combining flexible micro-bundle tubes with gel material to achieve the mechanical properties of rigid tubes (pistoning prevention) while retaining the flexibility and ease of handling of soft tubes. The gel-filled flexible tube composite provides both the protective function against pistoning and the operational flexibility needed for installation and maintenance.
3Reliability
If additional reinforcement or coiling is added to reduce pistoning in cables longer than 200 meters, then the pistoning effect is reduced, but the installation costs increase
Solution Approach 1:
The gel material provides self-service pistoning prevention by automatically filling the annular space between optical fibers and the micro-bundle tube during cable assembly. This self-contained solution eliminates the need for additional external reinforcement elements or complex coiling procedures, particularly benefiting long cable installations where pistoning effects are most pronounced. The gel performs the protective function inherently as part of the cable structure.
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
Significantly reduces pistoning effects while maintaining flexibility and reducing handling costs, allowing for efficient and cost-effective connection operations without damaging the optical fibers.
Implementation Method 1
a holding wire wrapped around said at least one fiber optic module to hold said at least one fiber optic module against the central mechanical reinforcement carrier
Implementation Method 2
When the outdoor temperature is high, the optical cable lengthens while in winter, when the outdoor temperature is low, the optical cable shrinks and decreases in length
Data Source
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AI summary
The invention relates to an optical cable installation comprising at least one optical junction box (20) and at least one optical cable (28) connected to said at least one optical junction box, said at least one optical cable (28) comprising: - a central mechanical reinforcement carrier (32), - at least one optical fiber module (34) disposed around the central mechanical reinforcement carrier (32), - at least one retaining wire (38) wrapped around said at least one optical fiber module (34) to hold said at least one optical fiber module (34) against the central mechanical reinforcement carrier (32), and wherein the central mechanical reinforcement carrier (32) is fixed to said at least one optical junction box (20) to limit longitudinal displacement of said at least one optical fiber module (34) inside along a protective sheath (40).