Multiband Optical Power Balancing Against SRS-Induced Unevenness

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Solution Overview

Problem

The Stimulated Raman Scattering (SRS) effect causes power shift from short wavelengths to long wavelengths and power unevenness in the Raman gain spectrum, limiting the long-distance transmission capability and increasing nonlinear costs in broadband multiband optical transmission systems.

Innovation Solution

A control method for a multiband optical transmission system that involves determining multiple power adjustment points and jointly adjusting intra-band and inter-band powers to achieve a balanced state, using optical power amplifiers, line optical amplifiers, and optical preamplifiers to ensure power balance and flatness of the optical signal-to-noise ratio (OSNR).

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If high-power optical signals are transmitted to increase transmission capacity, then transmission capacity is improved, but nonlinear effects increase limiting transmission distance

Engineering Contradiction:

Improvetransmission capacityVSAvoidtransmission distance

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent dynamically adjusts optical power parameters at multiple points along the transmission path. By changing power levels adaptively rather than maintaining constant high power, the system achieves high transmission capacity while keeping nonlinear effects within acceptable limits, thus extending transmission distance.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The system implements feedback control by monitoring optical signal characteristics and adjusting power at subsequent amplification points. This feedback mechanism allows the system to maintain optimal power levels that maximize transmission capacity while preventing excessive nonlinear effects that would limit transmission distance.

Inventive Principle:

Principle #23Feedback

2Object-affected harmful factors

If optical power is increased to overcome SRS effect, then power shift compensation is improved, but power unevenness and nonlinear costs increase

Engineering Contradiction:

ImproveSRS effect compensationVSAvoidpower unevenness and nonlinear costs

Core Design Contradiction:

Object-affected harmful factorsVSObject-generated harmful factors

Solution Approach 1:

The patent applies different power adjustment strategies to different wavelength bands and different locations in the transmission path. By tailoring the power compensation locally to each band's specific SRS characteristics rather than applying uniform power increase, the system compensates for SRS effect while minimizing overall power unevenness and nonlinear costs.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The system dynamically adjusts power parameters selectively across different wavelength bands based on their individual SRS impact. This differential parameter adjustment compensates for power shift caused by SRS while avoiding excessive power levels that would generate additional nonlinear effects and power unevenness.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If single-point power adjustment is used to simplify control, then device complexity is reduced, but power balance and OSNR flatness cannot be achieved

Engineering Contradiction:

Improvecontrol complexityVSAvoidpower balance and OSNR flatness

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent divides the transmission path into multiple segments with separate power adjustment points. This segmentation allows independent control of power at each point, enabling precise power balance and OSNR flatness across different wavelength bands while distributing the control complexity across multiple manageable nodes rather than requiring a single complex adjustment mechanism.

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 method balances the SRS effect, avoiding power unevenness and nonlinear costs, enabling reliable long-distance transmission of multiband optical signals.

Implementation Method 1

using optical power amplifiers, line optical amplifiers, and optical preamplifiers to ensure power balance and flatness of the optical signal-to-noise ratio (OSNR)

Methodology Applied

Scientific EffectOptical amplification:

Implementation Method 2

the Stimulated Raman Scattering (SRS) effect is a key factor affecting the performance of a broadband multiband optical transmission system. Because the SRS effect causes power shift from short wavelengths to long wavelengths

Methodology Applied

Scientific EffectStimulated Raman Scattering:

Data Source

PatentEP4718746A1Control method of multiband optical transmission system, communication device and storage medium

Publication Date: 2026.04.01 ZTE CORP

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AI summary

The present application discloses a control method for a multiband optical transmission system, a communication device, and a storage medium, belonging to the technical field of optical network communication. The control method for the multiband optical transmission system includes: determining multiple power adjustment points in the optical signal transmission multiplexing section of the multiband optical transmission system; and controlling the multiple power adjustment points to jointly adjust an intra-band power and an inter-band power to cause an optical transmission power of the multiband optical transmission system to be in a balanced state.