Layered Photonic Circuit Coupling for Nonlinear Optical Effects

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Solution Overview

Problem

Existing photonic integrated circuits (PICs) face challenges in achieving high component densities and efficient nonlinear optical effects due to limitations in material integration and coupling precision, leading to suboptimal performance and increased transmission losses.

Innovation Solution

The integration of ordinary optical materials with nonlinear optical materials in separate layers, utilizing evanescent coupling and controlled spacing through cladding layers, allows for precise control of coupling and enhanced nonlinear optical effects, such as frequency doubling and parametric down-conversion, while maintaining low transmission losses.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If ordinary optical materials and nonlinear optical materials are integrated in the same layer, then component density increases, but coupling precision and transmission losses deteriorate

Engineering Contradiction:

Improvecomponent densityVSAvoidcoupling precision

Core Design Contradiction:

Quantity of substanceVSManufacturing precision

Solution Approach 1:

The patent transitions from planar (2D) integration to three-dimensional (3D) integration by stacking ordinary optical material layers and nonlinear optical material layers in separate vertical layers. This dimensional change allows high component density while maintaining precise coupling through controlled vertical spacing via evanescent coupling, thereby resolving the contradiction between component density and coupling precision.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent segments the integrated circuit into distinct functional layers: ordinary optical material layers for linear optical operations and nonlinear optical material layers for nonlinear optical operations. This segmentation allows each layer to be independently optimized and coupled through controlled evanescent coupling, achieving both high component density and precise coupling control.

Inventive Principle:

Principle #1Segmentation

2Productivity

If component density is increased, then operational efficiency improves, but transmission losses increase

Engineering Contradiction:

Improveoperational efficiencyVSAvoidtransmission losses

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

By moving to 3D stacking, the patent achieves higher component density without increasing lateral congestion. The vertical separation between layers reduces optical interference and scattering losses, allowing high operational efficiency while maintaining low transmission losses through optimized vertical coupling paths.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Ease of manufacture

If material integration is simplified, then ease of manufacture improves, but nonlinear optical effects are reduced

Engineering Contradiction:

Improvematerial integrationVSAvoidnonlinear optical effects

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent segments the circuit into separate ordinary optical material layers and nonlinear optical material layers, each fabricated using standard, well-established processes. This segmentation simplifies manufacturing by allowing independent optimization of each layer type while ensuring strong nonlinear optical effects through controlled evanescent coupling between layers.

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 approach enables higher component densities and improved nonlinear optical effects in PICs, enhancing their performance and operational efficiency by optimizing material interactions and reducing manufacturing variability.

Implementation Method 1

The first photonic device and the second photonic device are separated by a cladding layer and are evanescently coupled

Methodology Applied

Scientific EffectEvanescent coupling:

Implementation Method 2

enhanced nonlinear optical effects, such as frequency doubling and parametric down-conversion

Methodology Applied

Scientific EffectFrequency doubling: Second Harmonic Generation

Implementation Method 3

enhanced nonlinear optical effects, such as frequency doubling and parametric down-conversion

Methodology Applied

Scientific EffectParametric down-conversion:

Data Source

PatentUS12517301B2Photon source and optical computing architecture

Publication Date: 2026.01.06 TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD

AI summary

A photonic integrated circuit (PIC) with a first structure of a ordinary optical material is enhanced with a second structure of a nonlinear optical material. The second structure provides or enhances nonlinear optical effects within the PIC. The first structure and the second structure may be in distinct layers. The first structure may be directly over and in contact with the second structure. Alternatively, the first structure and the second structures may be evanescently coupled while being vertically separated by a layer of cladding material. Lateral spacing may be used in combination with vertically spacing to precisely control a degree coupling between the first structure and the second structure.