Liquid-Mediated Optical Fiber Coupling for Dissimilar Fibers

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Solution Overview

Problem

Existing methods for optically coupling smaller and larger optical fibers face challenges in achieving efficient light signal transfer while minimizing risks associated with tensioning and manipulation, and are unsuitable for coupling fibers made of different materials with varying melting temperatures.

Innovation Solution

A method involving bringing a smaller optical fiber with a free end of reduced dimension into close proximity with a larger optical fiber within a coupling region, using a liquid to facilitate contact, and then allowing the liquid to evaporate, which can be followed by adhering or fusing the fibers, without the need for complex mechanical or heating steps, allowing for efficient coupling even between dissimilar materials.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If existing methods use tensioning and fusing to couple optical fibers, then optical coupling is achieved, but the risk of fiber damage increases and the process complexity increases

Engineering Contradiction:

Improvefiber damage riskVSAvoidprocess complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent introduces a liquid intermediary substance that facilitates the coupling of optical fibers without requiring direct mechanical tensioning or high-temperature fusing. The liquid enables the smaller fiber to move freely and make contact with the larger fiber, reducing mechanical stress and damage risk while simplifying the coupling process.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces the traditional mechanical tensioning and fusing system with a liquid-mediated coupling mechanism. Instead of applying mechanical tension to align and fuse fibers, the liquid allows the smaller fiber to drift and contact the larger fiber gently, substituting mechanical force with fluid-based positioning.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If existing methods tension and fuse optical fibers, then coupling is achieved, but the shape integrity of the receiving fiber deteriorates

Engineering Contradiction:

Improvecoupling efficiencyVSAvoidfiber shape integrity

Core Design Contradiction:

ReliabilityVSShape

Solution Approach 1:

The liquid intermediary protects the receiving fiber from direct mechanical contact and stress during the coupling process. The smaller fiber moves through the liquid to contact the larger fiber, preventing direct mechanical interference that would distort the receiving fiber's shape while still achieving effective optical coupling.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Adaptability or versatility

If existing methods are used to couple dissimilar fibers, then coupling is attempted, but the process becomes infeasible due to different melting temperatures

Engineering Contradiction:

Improvematerial compatibilityVSAvoidprocess feasibility

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent replaces the thermal fusing process with a liquid-mediated mechanical coupling approach. This substitution eliminates the need to heat fibers to different melting temperatures, making it feasible to couple dissimilar fibers (e.g., silica with low-phonon-energy glass) that have incompatible thermal properties. The liquid enables coupling without thermal processing.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the coupling parameter from thermal (temperature-based fusing) to liquid-mediated mechanical contact. This parameter change allows coupling of materials with vastly different melting points by eliminating thermal processing entirely, using instead a liquid that facilitates physical contact and optical coupling between dissimilar fibers.

Inventive Principle:

Principle #35Parameter changes

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 method enables quick, reliable, and high-efficiency optical coupling of dissimilar fibers, reducing the risk of fiber damage and maintaining the shape integrity of the receiving fiber, suitable for applications in communication networks and fiber-based lasers, particularly for fibers with different melting temperatures.

Implementation Method 1

bringing a free end of a first optical fiber, the second optical fiber and liquid in close proximity to one another within a coupling region, the free end of the first optical fiber moving within said liquid to contact the second optical fiber

Methodology Applied

Scientific EffectBuoyancy: Archimedes' Principle (Buoyancy)

Implementation Method 2

the liquid can for example be an alcohol

Methodology Applied

Scientific EffectEvaporation: Evaporation

Data Source

PatentUS12085759B2Method of coupling optical fibers, and optical coupler

Publication Date: 2024.09.10 UNIVERSITE LAVAL

AI summary

There is described a method of optically coupling a first optical fiber and a second optical fiber to one another. The method generally has a step of bringing a free end of the first optical fiber, the second optical fiber and liquid in close proximity to one another within a coupling region, the free end of the first optical fiber having a dimension below a critical dimension, the free end of the first optical fiber moving within said liquid to contact the second optical fiber along a given coupling length, said contact optically coupling the free end of the first optical fiber and the second optical fiber to one another.