Fluid-Actuated Adiabatic Coupler for Scalable Optical Switching

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Solution Overview

Problem

Existing optical switches, such as beam-steering and interference-based systems, face limitations in scalability, mechanical stability, and wavelength sensitivity, making them unsuitable for applications requiring large operational bandwidth and low manufacturing variability.

Innovation Solution

The development of a method and system for selectively adiabatically coupling electromagnetic waves between waveguides using a fluid positioning mechanism, where the interaction between waveguides and a fluid changes the coupling state, allowing for bistable operation with reduced manufacturing variability and low coupling losses, utilizing a silicon or silicon nitride platform for compact and high-density optical circuits.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If beam-steering mechanisms are used for optical switching, then switching functionality is achieved, but scalability is limited and mechanical stability is poor

Engineering Contradiction:

Improvemechanical stabilityVSAvoidscalability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent replaces mechanical beam-steering mechanisms with a thermally actuated optical switching system. The switch uses temperature-dependent refractive index changes in the waveguide core material to control light coupling between waveguides, eliminating mechanical moving parts and improving reliability while maintaining scalability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention changes the refractive index parameter of the waveguide core material through thermal actuation. By heating or cooling the waveguide, the refractive index changes, which controls the coupling coefficient between adjacent waveguides, enabling switching functionality without mechanical movement.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If interference-based switches are used, then switching functionality is achieved, but wavelength sensitivity increases and operational bandwidth decreases

Engineering Contradiction:

Improveoperational bandwidthVSAvoidwavelength sensitivity

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent replaces interference-based optical switching with thermal field-based switching. The thermally induced refractive index changes create evanescent field coupling effects that are much less sensitive to wavelength variations, thereby increasing operational bandwidth and reducing sensitivity to manufacturing tolerances.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of operation

If fluidic channels are aligned with waveguides for switching control, then switching functionality is achieved, but manufacturing complexity increases

Engineering Contradiction:

Improveswitching controlVSAvoidalignment precision

Core Design Contradiction:

Ease of operationVSEase of manufacture

Solution Approach 1:

The patent merges the fluidic channel and waveguide structures into a single integrated unit. The fluidic channel is formed to surround the waveguide core, eliminating the need for separate alignment steps and reducing manufacturing complexity while maintaining effective thermal control of the optical switching.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The invention transitions from planar alignment of fluidic channels with waveguides to a three-dimensional configuration where the fluidic channel surrounds the waveguide core. This vertical integration approach reduces sensitivity to lateral alignment errors and simplifies the manufacturing process.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 efficient, low-loss, and broadband adiabatic coupling with improved manufacturability and controllability, reducing sensitivity to wavelength and fabrication tolerances, thus addressing the limitations of prior art optical switches.

Implementation Method 1

as a consequence, this increases the manufacturability of the system... the interaction of the first waveguide and the second waveguide with a fluid and the controlling of the position of the fluid enables to change from one state to the other

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentEP3084492B1Adiabatic coupler

Publication Date: 2022.08.17 INTERUNIVERSITAIR MICRO ELECTRONICS CENT (IMEC VZW)

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AI summary

A system (100) for selectively adiabatically coupling electromagnetic waves from one waveguide to another waveguide is described. It comprises a first waveguide portion (130) and a second waveguide portion (140) having substantially different surface normal cross-sections. Portions thereof are positioned with respect to each other in a coupling region so that under first predetermined environmental conditions coupling of electromagnetic waves between the first waveguide portion and the second waveguide portion can occur and under second predetermined environmental conditions substantially no coupling of electromagnetic waves between the first waveguide portion and the second waveguide portion can occur. The system also comprises a fluid positioning means for selectively positioning at least a first fluid (110) simultaneously overlaying both said first waveguide portion and said second waveguide portion in the coupling region thus selectively inducing first predetermined environmental conditions or second predetermined environmental conditions.