Integrated Optical Coupling Switch Insulating Layer

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Solution Overview

Problem

The stability of integrated optical coupling switches is affected by the applied bias voltage, leading to potential short circuits between electrodes, which compromises their performance and yield.

Innovation Solution

The integration of an insulating layer between the lower and upper electrodes, along with a micro-electromechanical architecture for the upper electrode, prevents direct contact and ensures stability by maintaining the electrodes apart even when the upper electrode is attracted to the optical waveguides at a preset voltage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the upper electrode is designed to be movable and attracted to optical waveguides at a preset voltage, then the switching function is improved, but the risk of short circuit between electrodes increases

Engineering Contradiction:

Improveswitching functionVSAvoidshort circuit risk

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

An insulating layer is introduced as an intermediary between the upper and lower electrodes. This insulating layer prevents direct electrical contact and short circuits between the electrodes while allowing the upper electrode to move freely under electrostatic attraction for optimal optical coupling. The insulating layer acts as a mediator that enables the switching function without compromising electrical isolation.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If the upper electrode is allowed to contact optical waveguides directly, then the coupling efficiency is improved, but the stability of operation deteriorates due to potential short circuits

Engineering Contradiction:

Improvecoupling efficiencyVSAvoidoperational stability

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The insulating layer serves as a mediator that enables the upper electrode to approach and couple with the optical waveguides while preventing direct electrical contact. This maintains coupling efficiency through close proximity while ensuring operational stability by eliminating short circuit risks.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The insulating layer is implemented as a thin film structure that allows mechanical movement and close spacing between electrodes while maintaining electrical isolation. This thin film approach enables the upper electrode to be attracted to the optical waveguides for efficient coupling without compromising the stability through potential short circuits.

Inventive Principle:

Principle #30Flexible shells and thin films

3Device complexity

If no insulating layer is used between electrodes, then the device complexity is reduced, but the reliability deteriorates due to short circuit possibilities

Engineering Contradiction:

Improvestructure complexityVSAvoidshort circuit prevention

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The insulating layer is a thin intermediary layer that adds minimal structural complexity while providing essential electrical isolation between the upper and lower electrodes. This prevents short circuits and improves reliability without significantly increasing device complexity.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 configuration prevents short circuits and ensures the stability and improved yield of the integrated optical coupling switch by maintaining the electrodes apart, enhancing the switch's operational performance.

Implementation Method 1

an upper electrode that is arranged above the optical waveguides and formed as a micro-electromechanical architecture, and the upper electrode is attracted to come into contact with surfaces of the optical waveguides when reaching a preset voltage value

Methodology Applied

Scientific EffectElectrostatic attraction: Electrostatics

Implementation Method 2

The insulating layer is provided on a surface of the lower electrode and used for preventing the upper electrode from directly contacting the lower electrode to cause short circuit

Methodology Applied

Scientific EffectElectrical insulation: Dielectric

Implementation Method 3

An integrated optical coupling switch is a modulator made by utilizing an electro-optical effect of an electro-optical material, such as lithium niobate crystal (LiNbO3) or lithium tantalate crystal (LiTaO3). The electro-optical effect refers that a refractive index of the electro-optic material changes when a voltage is applied to a coupling area

Methodology Applied

Scientific EffectElectro-optical effect: Electro-Optic Effects

Data Source

PatentUS20240393655A1Integrated optical coupling switch

Publication Date: 2024.11.28 SHENZHEN LASER INST

AI summary

An integrated optical coupling switch, including two parallel optical waveguides, two electrostatically attracted electrodes and an insulating layer. The electrodes includes a lower electrode that is arranged on a silicon surface and avoids the optical waveguides, and an upper electrode that is arranged above the optical waveguides and formed as a micro-electromechanical architecture, and the upper electrode is attracted to come into contact with a surface of the optical waveguide when reaching a preset voltage value; the insulating layer is arranged on a surface of the lower electrode and used for preventing the upper electrode from contacting the lower electrode to form short circuit between the upper electrode and the lower electrode when the upper electrode is attracted to come into contact with the surface of the optical waveguide.