Laminated Fiber Assembly for Variable-Pitch Ferrule Coupling

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Solution Overview

Problem

There is a need for methods and components to facilitate the use of fiber optic ribbons with fibers retained at a first pitch in multi-fiber ferrules with fiber openings arranged at a second pitch that is larger than the first pitch, accommodating optical fibers with coatings less than 250 microns.

Innovation Solution

A laminated fiber assembly is created by stripping a ribbonizing material from a fiber ribbon, applying adhesive and polymeric sheets, and applying heat and pressure to convert the pitch of optical fibers from a first pitch to a second pitch, allowing the fibers to move relative to each other and flare out to a larger pitch.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If optical fibers are retained in a fiber ribbon at a first pitch (e.g., 200 microns), then the fiber ribbon can be manufactured with smaller coating diameters (e.g., 200 microns), but the fiber ribbon cannot be directly inserted into multi-fiber ferrules with larger pitch openings (e.g., 250 microns)

Engineering Contradiction:

Improvecompatibility between fiber ribbons and ferrulesVSAvoidpitch alignment accuracy

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent introduces an intermediary device consisting of a first polymeric sheet, second polymeric sheet, and adhesive layer that mediates between the fiber ribbon at first pitch and the ferrule at second pitch. This intermediary assembly allows the fiber ribbon to be coupled to the ferrule while accommodating the pitch difference, effectively resolving the compatibility issue without requiring modification to the fiber ribbon manufacturing precision

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the spatial parameter (pitch) of the optical fibers from a fixed first pitch to a variable pitch configuration. By allowing the fibers to transition from fixed spacing to variable spacing within the intermediary assembly, the system can adapt to different ferrule pitch requirements while maintaining proper fiber alignment and coupling

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If optical fibers are retained at a fixed pitch in a fiber ribbon, then the ribbon structure is simple and manufacturing is easy, but the fibers cannot be expanded to match larger ferrule openings

Engineering Contradiction:

Improveease of fiber insertion into ferrulesVSAvoidcomplexity of pitch conversion structure

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent transitions from a static fixed-pitch fiber ribbon to a dynamic variable-pitch configuration. The fibers are allowed to move from fixed spacing to variable spacing through the intermediary assembly, enabling dynamic adaptation to different ferrule pitch requirements while maintaining ease of insertion through the compliant polymeric sheets and adhesive

Inventive Principle:

Principle #15Dynamics

3Quantity of substance

If fiber ribbons with smaller pitch are used to accommodate smaller coating diameters, then material costs and ribbon density are improved, but compatibility with existing ferrule infrastructure is lost

Engineering Contradiction:

Improvefiber packing densityVSAvoidinteroperability with ferrule systems

Core Design Contradiction:

Quantity of substanceVSAdaptability or versatility

Solution Approach 1:

The intermediary assembly with polymeric sheets and adhesive acts as a buffer zone that preserves the high-density fiber ribbon structure while enabling compatibility with lower-density ferrule openings. The intermediary allows the dense fiber packing to be maintained in the ribbon while providing the necessary pitch expansion to match ferrule infrastructure

Inventive Principle:

Principle #24Intermediary (Mediator)

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 effectively converts the pitch of optical fibers from a fixed to a variable arrangement, enabling them to be inserted into multi-fiber ferrules with larger openings, enhancing compatibility and flexibility in fiber optic systems.

Implementation Method 1

The laminate portion includes the optical fibers, a first polymeric sheet, a second polymeric sheet, and an adhesive

Methodology Applied

Scientific EffectAdhesive bonding: Adhesive

Implementation Method 2

applying heat to the non-ribbonized portion of the fiber ribbon; and applying pressure to the non-ribbonized portion of the fiber ribbon. The application of the pressure to the non-ribbonized portion of the fiber ribbon results in the movement of the optical fibers within the non-ribbonized portion of the fiber ribbon away from each other

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Data Source

PatentUS20250314835A1Laminate pitch conversion

Publication Date: 2025.10.09 COMMSCOPE TECHNOLOGIES LLC

AI summary

The present disclosure relates to a laminated fiber assembly that provides pitch conversion between a fiber ribbon having a first pitch (e.g. 200 microns) to a plurality of non-ribbonized fibers having a variable pitch that is larger than the first pitch. The laminated fiber assembly has laminate portion with an adhesive arranged between the non-ribbonized fibers and polymeric sheets arranged on opposing sides of the non-ribbonized fibers of the fiber ribbon.