Optical Fiber Cable Jackets for Uniform Bending Without Rods

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Solution Overview

Problem

Conventional optical fiber cables with strengthening rods face difficulty in uniform bending, requiring excessive energy and complicating installation due to preferential bending in certain directions.

Innovation Solution

Optical fiber cables designed without strengthening rods, utilizing a cable jacket with a low coefficient of thermal expansion (CTE) and embedded strengthening yarns, such as glass or carbon fibers, to achieve uniform bending across all directions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If strengthening rods are used in optical fiber cables, then tensile strength is improved, but bending uniformity deteriorates causing preferential bending in certain directions

Engineering Contradiction:

Improvetensile strengthVSAvoidbending uniformity

Core Design Contradiction:

StrengthVSShape

Solution Approach 1:

The patent removes strengthening rods from the cable structure and replaces them with strengthening yarns embedded in the cable jacket. This extraction of the problematic component (rods) eliminates the preferential bending issue while maintaining necessary strength through the alternative strengthening yarn solution.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The cable jacket is formulated as a composite material containing embedded strengthening yarns (glass or carbon fibers) within the polyolefin matrix. This composite structure provides both the necessary tensile strength and uniform bending characteristics, resolving the contradiction between strength and bending uniformity.

Inventive Principle:

Principle #40Composite materials

2Strength

If strengthening rods are used to provide structural rigidity, then cable strength is improved, but installation complexity increases due to excessive bending energy requirements

Engineering Contradiction:

Improvestructural rigidityVSAvoidinstallation ease

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

By removing strengthening rods and replacing them with flexible strengthening yarns embedded in the jacket, the cable achieves structural integrity without the rigidity that causes difficult bending and complex installation procedures.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the mechanical parameters of the strengthening element from rigid rods to flexible yarns with appropriate tensile strength. This parameter change allows the cable to maintain strength while becoming more flexible and easier to install.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If conventional cable jackets are used, then manufacturing simplicity is maintained, but bending stress variability increases causing non-uniform bending

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidbending stress distribution

Core Design Contradiction:

Ease of manufactureVSShape

Solution Approach 1:

Inventive Principle:

Principle #40Composite materials

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 cables provide easier handling and installation by uniformly bending in all directions, reducing bending stress variability and maintaining tensile strength without rods, suitable for high-fiber count cables like Corning's RocketRibbon and UltraRibbon.

Implementation Method 1

cable jacket with a low coefficient of thermal expansion (CTE)

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Implementation Method 2

embedded strengthening yarns, such as glass or carbon fibers

Methodology Applied

Scientific EffectComposite materials: Composite Materials

Data Source

PatentEP3874306B1Optical fiber cables with flexible, non -preferential bend jackets

Publication Date: 2025.09.17 CORNING RES & DEV CORP

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AI summary

Embodiments of the disclosure relate to an optical fiber cable. The optical fiber cable includes a cable jacket having an inner surface and an outer surface in which the inner surface defines a central bore along a longitudinal axis of the optical fiber cable and the outer surface defines the outermost extent of the cable. The optical fiber cable also includes at least one access feature disposed in the cable jacket between the inner surface and the outer surface. Further included are a first plurality of optical fiber bundles. Each optical fiber bundle includes a second plurality of optical fiber ribbons that has a third plurality of optical fibers arranged in a planar configuration. The optical fiber cable bends uniformly in all directions transverse to the longitudinal axis of the optical fiber cable.