Fiber Optic Furcation Assembly for Reduced Cross-Dimensional Width

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Solution Overview

Problem

Existing fiber optic cable assemblies face challenges in reducing the cross-dimensional width at the furcation end due to oversized furcation tubes and connection interfaces, which hinder installation in space-constrained pathways.

Innovation Solution

The use of transformable furcation tubes made from heat shrink material that can contract from an expanded to a contracted configuration, along with a staggered configuration of furcation legs, allows for a minimized cross-dimensional width, enabling a smaller pulling grip and increased packing density.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional furcation tubes are used to terminate optical fibers, then the connection interface is secure and reliable, but the cross-dimensional width of the cable assembly increases, making installation difficult in space-constrained pathways

Engineering Contradiction:

Improveconnection interface reliabilityVSAvoidcross-dimensional width at furcation end

Core Design Contradiction:

ReliabilityVSArea of moving object

Solution Approach 1:

The furcation tube is designed to be transformable between an expanded configuration (for inserting optical fibers) and a contracted configuration (for minimizing cross-dimensional width). This dynamic transformation allows the tube to provide secure fiber termination while reducing the overall width of the cable assembly at the furcation end, resolving the contradiction between connection reliability and space efficiency.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The diameter of the furcation tube is changed from an expanded state (larger diameter for fiber insertion) to a contracted state (smaller diameter for compact cable width). By changing the physical parameter of tube diameter, the system achieves both secure fiber termination and reduced cross-dimensional width, eliminating the need to choose between reliability and compactness.

Inventive Principle:

Principle #35Parameter changes

2Quantity of substance

If more optical fibers are packed into the cable to meet bandwidth demand, then the fiber count increases, but the cable assembly width increases, making it incompatible with existing fixed-size pathways

Engineering Contradiction:

Improvenumber of optical fibersVSAvoidcable assembly width

Core Design Contradiction:

Quantity of substanceVSArea of moving object

Solution Approach 1:

The transformable furcation tube allows high fiber-count cables to be installed in fixed-size pathways by contracting to a smaller width after fiber insertion. This enables increased fiber density without permanently increasing the cable assembly width, resolving the contradiction between fiber quantity and pathway compatibility.

Inventive Principle:

Principle #15Dynamics

3Area of moving object

If the furcation tube diameter is reduced to minimize cable width, then the cross-dimensional width decreases, but it becomes difficult to insert optical fibers into the tube during manufacturing

Engineering Contradiction:

Improvecross-dimensional width at furcation endVSAvoidease of fiber insertion into furcation tube

Core Design Contradiction:

Area of moving objectVSEase of manufacture

Solution Approach 1:

The furcation tube is expanded to a larger diameter before fiber insertion to facilitate easy manufacturing and fiber placement. After fibers are inserted, the tube is contracted to its smaller operational diameter. This preliminary expansion action resolves the contradiction by making manufacturing easy while achieving the desired compact width in the final product.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The transformable nature of the furcation tube allows it to be in an expanded state during manufacturing (easy fiber insertion) and transition to a contracted state during installation and operation (minimal cable width). This dynamic behavior eliminates the need to choose between manufacturing ease and compact dimensions.

Inventive Principle:

Principle #15Dynamics

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

This approach facilitates the installation of fiber optic cable assemblies in fixed-size pathways by reducing the cross-sectional width, overcoming the limitations of traditional furcation tubes and enabling higher fiber densities.

Implementation Method 1

transformable furcation tubes made from heat shrink material that can contract from an expanded to a contracted configuration

Methodology Applied

Scientific EffectHeat shrink: Thermal Contraction

Data Source

PatentUS12455424B2Fiber optic cable assembly with high packing density and method of making same

Publication Date: 2025.10.28 CORNING RES & DEV CORP

AI summary

A fiber optic cable assembly having a reduced cross-dimensional width includes a fiber optic cable carrying a plurality of optical fibers and having a furcation formed at an end thereof. The furcation includes a furcation housing and a plurality of furcation tubes extending from the furcation housing. Each of the plurality of furcation tubes is configured to receive a number of the plurality of optical fibers. The furcation further includes at least one connection interface terminating the optical fibers received in each of the plurality of furcation tubes. At least one of the furcation tubes has a diameter substantially equal to a theoretical minimum diameter corresponding to the number and size of the optical fibers received therein, and may be formed from a heat shrink material. A method of making such a fiber optic cable assembly is also disclosed.