Sacrificial Fiber Optic Adapter With Adiabatic Waveguide Transition

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Solution Overview

Problem

Fiber optic connectors are prone to damage from contamination and scratching, leading to increased optical loss and back reflection, especially in decentralized networks where inaccessible terminations are difficult and costly to repair, and existing solutions either introduce significant signal attenuation or fail to prevent damage propagation.

Innovation Solution

A compact, sacrificial fiber optic union adapter with an internal adiabatic waveguide core transition section that interconnects two fiber optic cables with low insertion loss and low back reflection, using a miniature fiber stub to prevent direct contact between polished end faces and allowing for efficient optical coupling through a slow variation of waveguide core optical propagation characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If direct contact between polished end faces is used for fiber optic connection, then low insertion loss is achieved, but connector damage propagates through the network

Engineering Contradiction:

Improveoptical insertion lossVSAvoidconnector damage propagation

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

A sacrificial ferrule is introduced as an intermediary component between two fiber optic connectors. This ferrule contains a fiber stub that physically contacts both connectors, preventing direct contact between the valuable connector end faces while maintaining optical signal transmission. The sacrificial ferrule absorbs damage from contaminated or damaged connectors, protecting the network's valuable terminations.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent employs a disposable sacrificial ferrule that is intentionally designed to be replaceable and inexpensive compared to the fiber optic connectors it protects. When the sacrificial ferrule becomes damaged or contaminated, it is discarded and replaced, preventing damage propagation to the more valuable permanent connectors in the network.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Ease of repair

If inaccessible fiber optic terminations are repaired by service calls, then damaged connectors are fixed, but maintenance costs increase significantly

Engineering Contradiction:

Improvetermination repair capabilityVSAvoidnetwork downtime

Core Design Contradiction:

Ease of repairVSLoss of time

Solution Approach 1:

The sacrificial ferrule is pre-installed at accessible locations in the network, creating a protective buffer before damage can reach inaccessible terminations. This preliminary protective measure allows network operators to replace damaged components at convenient locations rather than traveling to remote sites for repairs.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The network is segmented into protected and unprotected zones by strategically placing sacrificial ferrules at accessible termination points. This segmentation isolates valuable inaccessible terminations from damage risks, allowing repairs to be performed on replaceable sacrificial components rather than critical remote terminations.

Inventive Principle:

Principle #1Segmentation

3Loss of energy

If polished ferrule contact areas are used, then low back reflection is achieved, but scratching from contaminants degrades optical performance

Engineering Contradiction:

Improveback reflectionVSAvoidcontaminant scratching

Core Design Contradiction:

Loss of energyVSObject-affected harmful factors

Solution Approach 1:

The sacrificial ferrule serves as a cushioning layer that absorbs the harmful effects of contaminants and scratching before they can reach the valuable connector end faces. By placing this protective barrier in advance, the patent prevents contaminants from causing damage to the optical surfaces that would otherwise result in increased back reflection and signal loss.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 minimizes networking downtime and reduces maintenance costs by protecting back-side fiber optic cable spans from damage, allowing for easy replacement of the adapter rather than costly repairs to inaccessible terminations, while maintaining low optical loss and back reflection.

Implementation Method 1

Methodology Applied

Scientific EffectAdiabatic waveguide core transition: Waveguide (optics)

Data Source

PatentUS8480310B2Protective fiber optic union adapters

Publication Date: 2013.07.09 TELESCENT INC

AI summary

Devices to enhance the reliability of optical networks and to reduce the cost of repair are disclosed in this invention. In particular, compact and inexpensive fiber optic union adapters with built-in protective isolation prevent the transfer of damage from one connectorized fiber optic cable to another. The fiber optic union includes a split sleeve with an interior channel and a fiber stub centrally located within the interior channel. The fiber stub makes direct optical contact with the cable endfaces to enable efficient optical transmission between interconnected cables while providing a low loss, low back reflection adiabatic transition between the waveguide cores of the two cables.