Fiber Optic Cable Jacket with Embedded Discontinuities for Safe Access

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Solution Overview

Problem

Accessing and terminating fibers within protected cable jackets is difficult and hazardous, requiring extensive use of sharp tools, which increases installation time and cost.

Innovation Solution

A cable jacket design featuring a primary polymeric material with embedded discontinuities of a second material, allowing for controlled separation and access to the core, utilizing extrudable polymers with varying cure conditions and adhesion properties to facilitate safe and efficient fiber access.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the cable jacket is designed to maximize fiber protection, then fiber safety and structural integrity are improved, but cable access becomes difficult and hazardous requiring sharp cutting tools

Engineering Contradiction:

Improvefiber protectionVSAvoidcable access

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The cable jacket is segmented into two distinct material zones: a primary protective portion and embedded discontinuities of a second material. This segmentation creates preferential tear paths that allow the jacket to be separated into manageable sections, enabling safe fiber access without compromising overall structural integrity during installation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the cable jacket have different material properties. The primary portion maintains high strength and protection, while the embedded discontinuities of second material have controlled weakness to facilitate tearing. This local quality differentiation allows the jacket to provide both protection and access functionality in different locations.

Inventive Principle:

Principle #3Local quality

2Ease of operation

If extensive sharp cutting tools are used to access cable interior, then fiber access is achieved, but installation time and cost increase

Engineering Contradiction:

Improvefiber accessVSAvoidinstallation time

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

The discontinuities are pre-formed and embedded within the jacket during manufacturing, creating ready-to-tear pathways. Installers only need to apply minimal force to initiate separation along these pre-defined paths, eliminating the need for extensive cutting operations and significantly reducing installation time.

Inventive Principle:

Principle #10Preliminary action

3Strength

If discontinuity materials are extruded with strong bonding to ensure jacket integrity, then cable structural strength is improved, but separation capability is reduced

Engineering Contradiction:

Improvejacket bonding strengthVSAvoidjacket separation

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The bonding parameters between first and second materials are precisely controlled during extrusion. The second material includes a select quantity of the first material to enhance bonding, creating an adhesion strength that is sufficient to maintain jacket integrity during handling and installation, but controlled enough to allow clean separation along the discontinuity when needed.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP2633355B1Fiber optic cables with extruded access features and methods of making fiber optic cables

Publication Date: 2020.07.15 CORNING OPTICAL COMMUNICATIONS LLC

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Figure 2A~2C
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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.