Multi-Fiber Ferrule Force Centering for Alignment Precision

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Solution Overview

Problem

Conventional multi-fiber connectors lack the ability to precisely align and balance ferrules, leading to uneven polishing of optical fibers, and are not robust enough for high-density installations and adverse environmental conditions.

Innovation Solution

A receptacle and plug assembly with a multi-fiber ferrule that incorporates pivot points, spring configurations, and guard fibers to ensure precise alignment and even polishing, while accommodating multiple stacks of fiber optic ribbons and withstanding high tensile loads.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional multi-fiber ferrules are used without force centering structures, then the connector assembly is simpler in structure, but the ferrule alignment precision deteriorates leading to uneven polishing of optical fibers

Engineering Contradiction:

Improveferrule alignment precisionVSAvoidconnector assembly structure

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

A force centering structure comprising a ferrule holder and spring mechanism is introduced as an intermediary component between the ferrule and the connector housing. This mediator applies balanced forcing forces to center the ferrule precisely, resolving the alignment precision issue without requiring complex adjustment mechanisms

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The spring constant and geometric parameters of the force centering structure are optimized to provide the exact forcing forces needed for precise ferrule alignment. By adjusting these parameters, the system achieves optimal alignment precision while maintaining structural simplicity

Inventive Principle:

Principle #35Parameter changes

2Strength

If conventional receptacle and plug assemblies are used, then the device is easier to manufacture, but the assembly cannot withstand high tensile loads required for FTTx installations

Engineering Contradiction:

Improvetensile load capacityVSAvoidassembly manufacturing

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The connector assembly utilizes composite construction combining metal components (housing, ferrule holder) with elastic elements (springs). This composite structure provides both the high tensile load capacity needed for FTTx installations and the precision alignment capabilities, while remaining manufacturable using standard industrial processes

Inventive Principle:

Principle #40Composite materials

3Manufacturing precision

If conventional ferrule configurations are used, then the polishing process is simpler, but optical fibers near the edges are over-polished

Engineering Contradiction:

Improvepolishing uniformityVSAvoidferrule structure

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The force centering structure is designed to apply localized forcing forces at specific points on the ferrule, creating a non-uniform force distribution that compensates for the natural tendency toward edge over-polishing. This local quality adjustment ensures uniform polishing across all optical fibers including those near the edges

Inventive Principle:

Principle #3Local quality

4Measurement precision

If conventional receptacles are used that are not force centered, then the assembly is more compact, but the ferrule end faces are not precisely aligned during mating

Engineering Contradiction:

Improveferrule end face alignmentVSAvoidreceptacle assembly volume

Core Design Contradiction:

Measurement precisionVSVolume of moving object

Solution Approach 1:

The force centering mechanism operates in a dimensional space perpendicular to the mating direction, applying forces that center the ferrule in the lateral dimensions. This allows precise end face alignment without increasing the length of the assembly in the mating direction, maintaining compactness while achieving alignment precision

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 solution provides precise alignment and balanced ferrule end faces, prevents over-polishing, and enhances the robustness and durability of the connector assembly for high-density installations and harsh environments.

Implementation Method 1

a spring configured to apply a forcing force to the ferrule holder such that the ferrule is force centered with respect to the alignment sleeve

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS7429136B2Connector assembly having multi-fiber ferrule with force centering

Publication Date: 2008.09.30 CORNING OPTICAL COMMUNICATIONS LLC

AI summary

A fiber optic connector assembly comprising a connector housing, at least one multi-fiber ferrule maintained within the connector housing, the at least one multi-fiber ferrule defining a front end for presenting at least one optical fiber for optical connection with at least one other mating ferrule and a rear end for inserting the at least one optical fiber into the ferrule, and a biasing member maintained within the connector housing operable for providing a biasing force to the multi-fiber ferrule, wherein the biasing force is not applied to the rear end of the multi-fiber ferrule. A connector assembly including a 72 fiber ferrule and force centering structure for applying on-axis force to the ferrule, while preventing off-axis forces generated by a biasing spring from being applied to the ferrule.