Fiber Optic Cable Jacket with Coextruded Access Discontinuities
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Solution Overview
Problem
Accessing and terminating fibers within cable jackets is difficult due to protective designs, often requiring sharp cutting tools that pose safety risks and increase installation costs.
Innovation Solution
A fiber optic cable design featuring a polymeric extruded jacket with embedded discontinuities of a different material, allowing the jacket to be easily separated and providing safe access to the cavity without damaging the fibers or strength members, using a coextrusion process to bond the primary and secondary materials for robustness and low peel forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cable jacket is designed to maximize fiber protection, then fiber safety and cable robustness are improved, but access to fibers becomes difficult and requires sharp cutting tools
Solution Approach 1:
The cable jacket is segmented into two distinct material regions: a primary polymeric material providing robust protection, and a secondary discontinuous material forming accessible features. This segmentation allows the jacket to simultaneously provide strong fiber protection while creating easy-access points through the discontinuous material regions that can be readily opened without sharp tools.
Solution Approach 2:
Different regions of the cable jacket have different material properties: the primary polymeric material provides high strength and protection, while the secondary material regions provide ease of access. This local differentiation of material quality allows simultaneous optimization of both protection and accessibility at different locations of the same component.
2Ease of operation
If extensive sharp cutting tools are used for cable access, then access to fibers is achieved, but safety risks and installation costs increase
Solution Approach 1:
The hazardous function of sharp cutting tools is extracted from the cable access process. Instead of requiring external cutting tools, the cable jacket itself contains embedded discontinuous material regions that can be opened by hand, removing the need for dangerous sharp instruments while maintaining effective fiber access.
Solution Approach 2:
The secondary material regions act as disposable, sacrificial elements designed to be easily removed or opened. These regions are intentionally made from materials that are easier to cut or tear than the primary jacket material, providing a low-cost, safe entry point that sacrifices minimal structural integrity to enable safe access.
3Ease of operation
If extensive sharp cutting tools are used for cable access, then access to fibers is achieved, but installation time and costs increase
Solution Approach 1:
The cable jacket is pre-configured during manufacturing with embedded discontinuous material regions positioned to provide optimal access points. This preliminary preparation eliminates the need for on-site cutting operations, allowing installers to simply open the pre-designed access regions and access fibers immediately, significantly reducing installation time.
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
Enables safe and efficient access to optical fibers by reducing the need for sharp tools, lowering installation costs, and maintaining the integrity of the cable under various conditions, including tensile loads and temperature variations.
Implementation Method 1
using a coextrusion process to bond the primary and secondary materials for robustness and low peel forces
Implementation Method 2
The at least one discontinuity allows the jacket to be separated at the discontinuity to provide access to the cavity
Data Source
AI summary
Cables are constructed with embedded discontinuities in the cable jacket that allow the jacket to be torn to provide access to the cable core. The discontinuities can be longitudinally extending strips of polymer material coextruded in the cable jacket.