Neural Network Nonlinear Waveform Distortion Compensation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Optical communication systems face challenges in efficiently compensating for nonlinear waveform distortion over long distances due to changes in physical characteristics of optical fiber channels, which requires manual optimization by skilled engineers and is time-consuming and costly, especially in inaccessible locations.

Innovation Solution

An optical communication system utilizing a neural network with a recursive intermediate layer and a lookup table (LUT) for nonlinear waveform distortion compensation, allowing for automatic learning and compensation within a terminal device, reducing circuit size and enabling real-time adjustment to changes in optical fiber characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If manual optimization by skilled engineers is used to compensate for nonlinear waveform distortion, then compensation accuracy is improved, but time consumption and cost increase significantly

Engineering Contradiction:

Improvecompensation accuracyVSAvoidoptimization time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The terminal device automatically performs nonlinear waveform distortion compensation by utilizing received signals and stored physical characteristics of the optical fiber channel. The device self-adjusts compensation parameters without requiring manual intervention from skilled engineers, thereby reducing optimization time while maintaining compensation accuracy through automated feedback mechanisms.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces the manual mechanical optimization process with an automated digital signal processing system. The terminal device uses digital algorithms to automatically adjust compensation parameters based on received signals and stored channel characteristics, substituting the need for manual engineer intervention with an automated electronic system.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Strength

If amplifiers are used to boost optical signal, then signal intensity is improved, but optical signal-to-noise ratio deteriorates

Engineering Contradiction:

Improvesignal intensityVSAvoidsignal-to-noise ratio

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent introduces a nonlinear waveform distortion compensation function as an intermediary between the amplified optical signal and the terminal device receiver. This compensation function processes the distorted signal to remove nonlinear effects before detection, allowing the use of amplifiers for signal boosting while maintaining signal quality through intermediate signal processing.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent combines multiple signal processing techniques including linear equalization, nonlinear waveform distortion compensation, and physical characteristic-based optimization into a composite compensation system. This multi-layered approach addresses both signal intensity requirements and signal-to-noise ratio preservation simultaneously.

Inventive Principle:

Principle #40Composite materials

3Reliability

If optical signal intensity is increased to improve received optical signal noise ratio, then signal-to-noise ratio is improved, but nonlinear waveform distortion increases

Engineering Contradiction:

Improvesignal-to-noise ratioVSAvoidnonlinear waveform distortion

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent converts the harmful nonlinear waveform distortion generated by high signal intensity into a compensable effect. By storing physical characteristics of the optical fiber channel and using these to guide compensation processing, the system transforms the distortion that occurs during transmission into information that can be used to restore the original signal at the receiver.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent performs preliminary storage of physical characteristics of the optical fiber channel before signal transmission and compensation. By having this information available in advance, the terminal device can pre-configure compensation parameters to counteract the nonlinear distortion that will occur during high-power transmission, preventing rather than merely correcting the distortion.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12052055B2Method of equalizing waveform distortion, terminal device, and optical communication system

Publication Date: 2024.07.30 NEC CORP

AI summary

An optical communication system includes a first terminal device configured to receive first data, wherein the first terminal device is configured to generate an optical waveform based on the received first data. The optical system further includes an optical communication path configured to receive the optical waveform from the first terminal device. The optical system further includes a second terminal device configured to receive the optical waveform from the optical communication path, wherein the second terminal device is configured to output second data based on the optical waveform. At least one of the first terminal device or the second terminal device includes a nonlinear waveform distortion compensation device. The nonlinear waveform compensation device is configured to correct nonlinear waveform distortion resulting from the optical waveform propagating along the optical communication path, and the nonlinear waveform compensation device includes at least one recursive intermediate layer.