Waveguide Delay Equalization in Optical Communication

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Solution Overview

Problem

Conventional copper data channels face signal attenuation and crosstalk due to radiated electromagnetic energy, which are difficult to mitigate effectively with existing equalization techniques, limiting scalability and requiring significant power and complexity.

Innovation Solution

A system and method for waveguide delay-based equalization with summing at single-ended to differential converters in optical communication, utilizing photonically-enabled integrated circuits with optical modulators, photodetectors, and transimpedance amplifiers to split and delay optical signals, converting them into electrical signals for processing and equalization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If equalization techniques are applied to copper data channels, then signal quality is improved to some extent, but power consumption and system complexity increase significantly

Engineering Contradiction:

Improvesignal qualityVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces electrical signal processing in copper channels with optical signal processing. Optical signals propagate through waveguides without the electromagnetic interference and attenuation problems of copper channels, eliminating the need for complex electrical equalization circuits while maintaining signal quality.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces optical waveguides as an intermediary medium to transmit signals between components. The waveguides provide a transmission medium that avoids the fundamental limitations of copper channels, enabling long-reach communication without requiring complex compensation techniques.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If conventional equalization methods are used, then some signal degradation is compensated, but reach extension is very limited and scalability is poor

Engineering Contradiction:

Improvesignal compensationVSAvoidscalability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent substitutes optical waveguide-based signal transmission for electrical copper channel transmission. Optical signals experience minimal attenuation and interference, enabling much longer transmission distances and better scalability compared to electrical equalization methods.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of manufacture

If copper channels are used for data transmission, then existing infrastructure can be utilized, but signal attenuation and crosstalk due to radiated electromagnetic energy become significant impediments

Engineering Contradiction:

Improveinfrastructure utilizationVSAvoidsignal attenuation and crosstalk

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent replaces electrical signal transmission through copper channels with optical signal transmission through waveguides. Optical signals do not radiate electromagnetic energy, eliminating crosstalk and reducing attenuation, thereby removing the harmful effects that limit copper channel performance.

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 enhances signal quality by reducing inter-symbol interference, improving communication speed and scalability, while avoiding the limitations of copper channels, such as signal attenuation and crosstalk.

Implementation Method 1

a directional coupler operable to: receive an input optical signal; split the input optical signal into first and second optical signals

Methodology Applied

Scientific EffectOptical coupling: Optical Fibre

Implementation Method 2

a first photodetector operable to generate a first electrical current signal from the first optical signal

Methodology Applied

Scientific EffectPhotodetection: Photoelectric Effect

Implementation Method 3

a first transimpedance amplifier operable to generate a first voltage signal from the first electrical current signal

Methodology Applied

Scientific EffectTransimpedance conversion: Electromagnetic Induction

Implementation Method 4

waveguide delay based equalization

Methodology Applied

Scientific EffectOptical waveguide propagation: Waveguide (optics)

Data Source

PatentUS11323185B2Method and system for waveguide delay based equalization with summing at single-ended to differential converters in optical communication

Publication Date: 2022.05.03 CISCO TECHNOLOGY INC

AI summary

Methods and systems for waveguide delay based equalization summing at single-ended to differential converters in optical communication are disclosed and may include: in an photonic circuit including a directional coupler, photodetectors, and a gain stage, receiving an input optical signal; splitting the input optical signal into first and second optical signals using the directional coupler; generating a first current from the first optical signal using a first photodetector; communicating the first voltage to a first input of the gain stage; generating a second current from the second optical signal using a second photodetector; communicating the second voltage to a second input of the gain stage; and generating a differential output voltage based on the first and second currents using the gain stage.