Dual-End Loopback Multi-Fiber Cable Measurement

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Solution Overview

Problem

Existing methods for qualifying high fiber count cables, such as those used in Passive Optical Networks (PONs), data centers, and wireless/5G networks, are time-consuming and prone to handling errors due to the need for bi-directional OTDR measurements and manual manipulation of optical connectors.

Innovation Solution

The implementation of a dual-end loopback-based multi-fiber cable measurement apparatus, which uses two multi-fiber loopback devices connected to the near and far ends of a multi-fiber cable to automatically identify and qualify individual fiber sections within a single acquisition, significantly reducing qualification time.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If traditional single-fiber or multi-fiber testing methods are used with manual connector manipulation, then measurement accuracy can be maintained, but qualification time increases significantly and handling errors occur

Engineering Contradiction:

Improvequalification timeVSAvoidtesting system complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The system segments the multi-fiber cable testing into individual fiber sections by using loopback devices that create separate measurement paths for each fiber or fiber pair, allowing simultaneous independent measurement while maintaining accuracy

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Loopback devices are introduced as intermediary components that enable automated bidirectional OTDR measurements by reflecting test signals back through the fiber under test, eliminating the need for manual connector manipulation while maintaining measurement accuracy

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If bidirectional OTDR measurements are performed manually on each fiber, then comprehensive fiber qualification is achieved, but handling errors increase and productivity decreases

Engineering Contradiction:

Improvemeasurement accuracyVSAvoidqualification time

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The system combines multiple fiber measurements into a single automated acquisition by connecting loopback devices to create continuous measurement paths, allowing simultaneous testing of multiple fibers while maintaining comprehensive qualification

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The automated system performs bidirectional measurements independently without human intervention, with the loopback devices automatically routing test signals and the system processing results, eliminating handling errors while maintaining accuracy

Inventive Principle:

Principle #25Self-service

3Ease of operation

If manual manipulation of optical connectors is required for fiber testing, then flexible setup is possible, but handling errors occur and productivity decreases

Engineering Contradiction:

Improvesetup flexibilityVSAvoidqualification time

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The system replaces manual mechanical connector manipulation with automated optical switching and loopback-based measurement paths, eliminating handling errors while maintaining setup flexibility through programmable configuration

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 allows for the simultaneous measurement of multiple fibers in a single acquisition, reducing qualification time from hours to minutes, and minimizing handling errors by automating the identification and qualification process.

Implementation Method 1

The optical fibers may transmit light from a source to a destination. The transmitted light may be backscattered and reflected. The backscattered and reflected light may be analyzed to determine properties of the optical fibers.

Methodology Applied

Scientific EffectBackscattering: Scattering

Implementation Method 2

Methodology Applied

Scientific EffectReflection: Reflection

Data Source

PatentUS12264984B2Dual-end loopback-based multi-fiber cable measurement

Publication Date: 2025.04.01 VIAVI SOLUTIONS INC(US)

AI summary

In some examples, dual-end loopback-based multi-fiber cable measurement may include connecting at least two multi-fiber loopback devices respectively to a near end and a far end of a multi-fiber cable to place at least two fibers of the multi-fiber cable in series. The at least two multi-fiber loopback devices may include a near-end multi-fiber loopback device connected to a fiber optic reflectometer and to the near end of the multi-fiber cable to connect together at least two near-end fibers of the multi-fiber cable. Further, the at least two multi-fiber loopback devices may include a far-end multi-fiber loopback device connected to the far end of the multi-fiber cable to connect together at least two far-end fibers of the multi-fiber cable.