Upjacketed Optical Fiber Cable for Roadbed Installation
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Solution Overview
Problem
Conventional optical fiber cable installations in roadbeds often cause degradation of road materials, such as asphalt, leading to cracking or softening, and require extensive and damaging excavation methods.
Innovation Solution
An optical fiber cable with an upjacket made from polymer materials that are chemically and mechanically compatible with roadbed components, such as asphalt, which is extruded to form a compatible outer layer that enhances the roadbed's properties and reduces the cable's profile, allowing for quicker, cleaner, and less damaging installation by forming a small channel in the heated roadbed and resealing it with the same material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional optical fiber cables are installed in roadbeds, then data transmission is achieved, but the cable materials cause degradation of road materials leading to cracking or softening
Solution Approach 1:
An upjacket layer is introduced as an intermediary between the conventional cable jacket and the roadbed. This upjacket is specifically designed to be chemically compatible with asphalt and roadbed materials, preventing harmful interactions while allowing the cable to perform its data transmission function. The upjacket acts as a barrier that mediates between the cable core and the roadbed environment.
Solution Approach 2:
The cable structure is transformed into a composite system with multiple layers having different properties. The inner cable jacket provides mechanical protection and structural integrity, while the outer upjacket layer provides chemical compatibility with roadbed materials. This composite structure allows the cable to simultaneously maintain its functional properties and prevent road material degradation.
2Ease of operation
If extensive excavation methods are used for cable installation, then the cable can be buried in the roadbed, but the installation process causes significant damage to the road surface
Solution Approach 1:
The installation process utilizes temperature parameter changes by heating the roadbed to a softened state, allowing the cable to be inserted with minimal excavation. The heated roadbed material becomes more pliable and easier to work with, reducing the mechanical damage caused during installation. After cable placement, the roadbed cools and rehardens, sealing around the cable.
Solution Approach 2:
The roadbed is pre-heated before cable installation to soften the material, making it more receptive to cable insertion. This preliminary thermal preparation reduces the force and excavation needed during the actual cable placement, minimizing damage to the road structure.
3Ease of manufacture
If the cable uses standard jacket materials, then manufacturing is simpler, but the materials are not chemically compatible with asphalt and cause roadbed degradation
Solution Approach 1:
The cable jacket is segmented into two distinct functional layers: the inner cable jacket made from conventional materials that provides mechanical protection and is easy to manufacture, and the outer upjacket layer made from chemically compatible materials that protects the roadbed. This segmentation allows each layer to be optimized for its specific function while maintaining overall manufacturing feasibility.
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 upjacketed optical fiber cable maintains the roadbed's performance characteristics, prevents harmful chemical leaching, and reduces installation damage, enabling faster and more efficient deployment without harming the road surface, while also providing benefits like improved adhesion and reduced susceptibility to environmental threats.
Implementation Method 1
The upjacket must be compatible with the road surface to insure continued long-term stability of the contact surface of the road, as well as prevent degradation of the constituents that make up the roadbed (e.g. by reacting with the bitumen present in the asphalt cement)
Implementation Method 2
The cable jacket comprises the polymer additive
Data Source
AI summary
Embodiments of an optical fiber cable configured for installation in a roadbed are provide. The optical fiber cable includes an optical fiber, a cable jacket surrounding the optical fiber, and an upjacket surrounding the cable jacket. The upjacket does not leach a chemical or chemicals into the roadbed that soften the roadbed. Also provided are embodiments of a method of producing an optical fiber cable configured for installation in a roadbed. Further, embodiments of a method of deploying an optical fiber cable into a roadbed are provided. The method involves the steps of forming a channel in the roadbed, inserting an optical fiber cable into the channel, and closing the channel so as to bury the optical fiber cable in the roadbed.