Optical Line System QoS Feedback for Transient Power Control

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Solution Overview

Problem

Optical communication systems face challenges in detecting and correcting channel tilt and managing transient power changes due to Stimulated Raman Scattering (SRS), which can degrade signal quality and limit system performance.

Innovation Solution

An Optical Multiplexed Section (OMS)-level feedback mechanism is implemented within channel activation/deactivation procedures in optical line systems, allowing for close monitoring of service-level and passband-level quality of service (QoS) metrics during loading operations and automatic adjustment of amplifier operating conditions through an automatic gain control (AGC) cycle.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If automatic gain control (AGC) cycles are executed after every spectral loading operation, then signal quality is maintained, but system timing performance deteriorates due to time-consuming cycles

Engineering Contradiction:

Improvesignal qualityVSAvoidsystem timing performance

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent implements a feedback mechanism where QoS metrics are monitored after spectral loading operations, and AGC cycles are only executed when threshold violations are detected. This selective feedback approach maintains signal quality when needed while avoiding unnecessary AGC cycles that would degrade timing performance.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

Instead of executing full AGC cycles after every loading operation, the system performs partial monitoring and only triggers AGC when necessary. This partial action approach reduces time consumption while maintaining adequate signal quality control.

Inventive Principle:

Principle #16Partial or excessive action

2Productivity

If spectral loading operations are serialized quickly, then productivity improves, but signal quality deteriorates due to transient power changes from SRS

Engineering Contradiction:

Improveloading operation speedVSAvoidsignal quality

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The system monitors QoS metrics after each spectral loading operation to detect transient power changes caused by SRS. This feedback mechanism allows rapid serialization of loading operations while maintaining signal quality by triggering corrective AGC cycles only when threshold violations occur.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system establishes QoS baseline measurements before spectral loading operations and sets threshold criteria in advance. This preliminary preparation enables rapid loading operations with immediate detection of quality degradation, allowing fast productivity while protecting signal quality.

Inventive Principle:

Principle #10Preliminary action

3Loss of time

If QoS monitoring is implemented at OMS-level with threshold-based AGC triggering, then loss of time is reduced by avoiding unnecessary AGC cycles, but device complexity increases

Engineering Contradiction:

Improvesystem timing performanceVSAvoidfeedback mechanism complexity

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The patent segments QoS monitoring into specific metric thresholds at the OMS level, breaking down the complex monitoring task into discrete, manageable threshold checks. This segmentation reduces the complexity of continuous monitoring while maintaining effective quality control through targeted threshold-based triggering.

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

This feedback mechanism improves overall system timing performance, enabling more loading operations to be serialized without unnecessary time-consuming AGC cycles, while maintaining required quality of service and reducing the risk of traffic impact.

Implementation Method 1

Wideband optical transmission systems experience Stimulated Raman Scattering (SRS), a physical effect that occurs in conventional optical fiber which transfers power from high to low frequency signals.

Methodology Applied

Scientific EffectStimulated Raman Scattering (SRS):

Data Source

PatentUS20250112695A1Systems and methods for service turn-up optimization through quality of service feedback on optical line systems

Publication Date: 2025.04.03 INFINERA CORP

AI summary

Optical networks, network elements, and methods of use are described herein, including a network element comprising a processor; and a non-transitory computer readable memory storing instructions that, when executed by the processor, cause the processor to: receive, from a headend network element, instructions to collect a QoS baseline measurement indicative of performance of optical carrier(s) on a transmission line, collect the QoS baseline measurement; collect a QoS current measurement of the QoS data, after a first spectral loading operation is performed on the transmission line segment by the headend network element; determine that a numerical difference between the QoS current measurement and the QoS baseline measurement is outside of a predetermined threshold; and send instructions to the headend network element to abort a second spectral loading operation for the transmission line segment and to execute an AGC cycle to adjust amplifier operating conditions.