Waveguide Phase-Change Modulator for Thermal-Loss Control

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Solution Overview

Problem

Existing optical modulation technologies in optical data communication systems are inefficient and unreliable, necessitating improvements in efficiency and reliability for data and information transmission.

Innovation Solution

An optical device incorporating a phase-change material layer and a heating member that minimizes thermal loss, enabling precise control of the phase-change material through direct thermal energy transfer, allowing for rapid and accurate structural phase transitions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If existing optical modulation tools are used, then optical data transmission can be achieved, but thermal efficiency and reliability are insufficient

Engineering Contradiction:

Improvereliability of optical modulationVSAvoidthermal loss

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent introduces a phase-change material layer as an intermediary between the heating member and the optical waveguide. This intermediary material efficiently converts thermal energy from the heating member into optical modulation, reducing thermal loss while improving reliability. The phase-change material absorbs heat from the heating member and translates it into controlled optical signal modulation, acting as a mediator that bridges the thermal and optical domains.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent utilizes changes in the physical parameters of the phase-change material (such as phase transitions between crystalline and amorphous states) to achieve optical modulation. By controlling temperature parameters through the heating member, the phase-change material undergoes reversible phase transitions that directly modulate optical properties, thereby improving both reliability and reducing energy loss through efficient parameter control.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If thermal energy is transferred to control phase-change material, then structural phase transitions can be achieved, but thermal loss reduces efficiency

Engineering Contradiction:

Improveefficiency of optical modulationVSAvoidthermal loss

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent applies local quality by concentrating thermal energy transfer at the specific interface between the heating member and the phase-change material layer, rather than distributing heat broadly. The heating member is positioned in direct contact with the phase-change material, creating a localized high-efficiency thermal coupling region. This localized approach minimizes thermal loss to surrounding areas while maximizing the efficiency of phase transitions in the target material, thereby improving overall productivity.

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If phase-change material is used for optical modulation, then modulation capability is enhanced, but manufacturing complexity increases

Engineering Contradiction:

Improvemodulation capabilityVSAvoiddevice structure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments the optical device into distinct functional layers: a waveguide layer, a phase-change material layer, and a heating member. This segmentation allows each component to be optimized independently and facilitates modular manufacturing. The phase-change material layer is deposited as a separate thin film layer on the waveguide, and the heating member is integrated as a distinct element, making the overall device structure manageable and manufacturable despite the enhanced modulation capability.

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

Enhances thermal efficiency and reliability of optical modulation by efficiently transferring heat from the heating member to the phase-change material, facilitating precise control and reliable structural phase transitions.

Implementation Method 1

heat produced from the heating member is directly transferred to the bridge segment of the light modulator thereby inducing a phase transition thereof

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

enabling precise control of the phase-change material through direct thermal energy transfer, allowing for rapid and accurate structural phase transitions

Methodology Applied

Scientific EffectPhase transition: Phase Change

Data Source

PatentUS12443061B2Optical device with phase-change materials and method of fabricating the same

Publication Date: 2025.10.14 TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD

AI summary

One embodiment of the present disclosure provides an optical device which includes a waveguide and a light modulator. The light modulator comprising a bridge segment positioned on the waveguide, wherein the bridge segment comprises a phase-change material. The optical device also includes a heating member. The heating member includes an intermediate segment and two electric contact segments. The intermediate segment is in direct contact with the bridge segment of the light modulator. The two electric contact segments are connected to two ends of the intermediate segment, wherein heat produced from the heating member is directly transferred to the bridge segment of the light modulator thereby inducing a phase transition thereof.