Adaptive Waveguide Width Tuning for Modal Phase Matching

Solution Overview

Problem

Conventional waveguide fabrication processes introduce localized thickness variations, disrupting phase matching conditions and reducing power conversion efficiency, particularly in longer waveguides, due to manufacturing imperfections.

Innovation Solution

Adaptive width tuning of waveguides based on measured localized thickness variations to maintain phase matching conditions, using correlation functions and numerical modeling to determine localized widths that compensate for thickness fluctuations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional waveguide fabrication processes are used, then manufacturing simplicity is maintained, but localized thickness variations disrupt phase matching conditions and reduce power conversion efficiency

Engineering Contradiction:

Improvephase matching condition precisionVSAvoidfabrication process complexity

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent applies local quality by varying the width of different sections of the waveguide according to localized thickness variations. Instead of maintaining a uniform width, each section's width is specifically adjusted to compensate for local thickness deviations, ensuring that phase matching conditions are satisfied locally throughout the waveguide structure.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the geometric parameters of the waveguide, specifically the width parameter, to compensate for thickness variations. By calculating and implementing localized width adjustments based on measured thickness data, the system maintains optimal phase matching conditions despite manufacturing imperfections in the thickness parameter.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If waveguide length is increased to improve conversion efficiency, then more interaction length is available, but thickness variations have greater cumulative effect and disrupt phase matching

Engineering Contradiction:

Improvepower conversion efficiencyVSAvoidphase matching stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies local quality by varying the width of different sections of the waveguide according to localized thickness variations. Instead of maintaining a uniform width, each section's width is specifically adjusted to compensate for local thickness deviations, ensuring that phase matching conditions are satisfied locally throughout the waveguide structure.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent applies preliminary action by measuring and characterizing thickness variations before final waveguide fabrication, and calculating the required width compensations in advance. The correlation function and numerical modeling are performed beforehand to determine the optimal width profile that will maintain phase matching throughout the entire waveguide length.

Inventive Principle:

Principle #10Preliminary action

3Manufacturing precision

If uniform waveguide width is maintained, then fabrication is simpler, but localized thickness variations cause phase matching deviations and amplify noisy modes

Engineering Contradiction:

Improvephase matching condition precisionVSAvoidwaveguide geometry complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent applies local quality by varying the width of different sections of the waveguide according to localized thickness variations. Instead of maintaining a uniform width, each section's width is specifically adjusted to compensate for local thickness deviations, ensuring that phase matching conditions are satisfied locally throughout the waveguide structure.

Inventive Principle:

Principle #3Local quality

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

Improves power conversion efficiency for desired modes while reducing noisy mode amplification, enhancing the performance of waveguides by maintaining phase matching conditions despite manufacturing imperfections.

Implementation Method 1

Second order nonlinear wave mixing in waveguides is a critical process for generating light at desired wavelengths which cannot be directly produced by lasers

Methodology Applied

Scientific EffectSecond order nonlinear wave mixing:

Implementation Method 2

the given phase matching condition is based on modal phase matching between two or more modes of light propagating in the waveguide

Methodology Applied

Scientific EffectModal phase matching:

Data Source

PatentUS20250284057A1Adaptive modal phase matching in waveguides for increased nonlinear conversion efficiency

Publication Date: 2025.09.11 HONEYWELL INTERNATIONAL INC

AI summary

To fabricate a waveguide with improved light coupling efficiency utilizing second order nonlinear optical coupling processes, localized thickness variations of at least one waveguide layer are first measured instead of assuming a constant thickness. Such localized thickness variations can change the phase matching condition needed to propagate light in the waveguide, thereby reducing efficiency of a waveguide. The width of the waveguide is then fabricated based on the localized thickness variations in order to achieve a desired modal phase matching condition, for example, by finite element modeling. In doing so, the waveguide can improve light coupling efficiency by compensating for localized thickness variations during the fabrication process.