Integrated EDFA with Embedded OTDR Metrology

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Solution Overview

Problem

Existing doped fiber amplifiers lack integrated metrology functionality for real-time characterization of optical fiber spans, leading to potential misconfiguration and inefficiencies in communication networks, especially when relying on rare-earth doped fiber amplifiers.

Innovation Solution

A doped fiber amplifier module is modified to include optical metrology components, such as OTDR, chromatic dispersion measurement capabilities, and a dual pump source, allowing for simultaneous amplification and characterization of fiber spans using a tunable laser source and shared or switched optical sources.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a doped fiber amplifier is modified to include integrated metrology functionality, then measurement precision and real-time characterization capability are improved, but device complexity increases

Engineering Contradiction:

Improvefiber span characterization accuracyVSAvoidmodule structure complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent combines the doped fiber amplifier and optical metrology components into a single integrated module. The metrology component includes an optical time domain reflectometer (OTDR), chromatic dispersion measurement capabilities, and a dual pump source, all merged with the amplifier in one compact unit. This integration enables simultaneous amplification and characterization of fiber spans without requiring separate measurement tools.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The integrated module performs multiple functions: optical signal amplification via the doped fiber amplifier, OTDR measurements for fiber characterization, chromatic dispersion measurements, and diagnostic testing. The dual pump source serves both the amplifier and the metrology component, enabling a single device to handle both amplification and measurement tasks.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Productivity

If separate measurement tools are used for fiber characterization, then device complexity is reduced, but loss of time and productivity decrease due to separate configuration and measurement steps

Engineering Contradiction:

Improvenetwork configuration efficiencyVSAvoidmeasurement and configuration time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

By merging the amplifier and metrology components into one integrated module, the patent eliminates the need for separate measurement tools and configuration steps. The module can be deployed and configured in a single operation, with real-time measurement capabilities built-in, significantly reducing the time required for network installation and optimization.

Inventive Principle:

Principle #5Merging (Combining)

3Device complexity

If a shared optical source is used for both amplification and metrology, then device complexity is reduced, but reliability may worsen due to potential interference between functions

Engineering Contradiction:

Improveoptical source configurationVSAvoidsignal measurement accuracy

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent segments the optical source into two independent parts: a pump source for the doped fiber amplifier and a separate optical source for the metrology component. This segmentation prevents interference between amplification and measurement functions, ensuring reliable and accurate signal measurements while maintaining system stability.

Inventive Principle:

Principle #1Segmentation

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

Enables accurate, real-time measurement of fiber characteristics, including length and type, and chromatic dispersion, improving network configuration and diagnostic capabilities within the same module, reducing the need for separate measurement tools and minimizing errors.

Implementation Method 1

a doped fiber amplifier (such as an erbium-doped fiber amplifier, or EDFA)

Methodology Applied

Scientific EffectStimulated emission:

Implementation Method 2

a separate component utilized to perform a selected type of optical metrology (e.g., optical time domain reflectometry (OTDR) measurements)

Methodology Applied

Scientific EffectOptical time domain reflectometry: Reflection

Implementation Method 3

Various metrology functions (e.g., measurement of chromatic dispersion, determination of fiber length and type, etc.) are provided by using a tunable laser source within the embedded metrology component

Methodology Applied

Scientific EffectChromatic dispersion: Dispersion (of waves)

Data Source

PatentUS9503181B2Rare earth-doped fiber amplifier with integral optical metrology functionality

Publication Date: 2016.11.22 II VI DELAWARE INC

AI summary

A doped fiber amplifier (e.g., an erbium-doped fiber amplifier—EDFA) module is configured to include metrology functionality for performing real-time measurements of the fiber spans connected to the EDFA. In one embodiment, a separate component utilized to perform optical time domain reflectometry (OTDR) measurements is embedded with the EDFA module. The OTDR measurement component includes its own laser source and detector, which are used to analyze the input and output fiber spans associated with the EDFA. In another embodiment, the pump laser of the EDFA is also used as the optical probe light source for the OTDR component, where the source is either “switched” or “shared” between performing amplification and providing OTDR measurements. In yet another embodiment, a “dual pump” source is included with the OTDR component itself and modified to utilize one laser for amplification and the other for OTDR purposes.