Thermal Management of Ridge-Type Hybrid Laser
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Solution Overview
Problem
Thermal management of small-scale integrated devices, particularly photonic integrated circuits, is hindered by high heat flux levels and poor thermal resistance, leading to inefficient operation and increased energy consumption, which limits the integration density and bandwidth requirements for exaflop computing.
Innovation Solution
A ridge-type hybrid laser with a thermally conductive, electrically insulating coating is used to efficiently transfer heat away from the laser, reducing thermal resistance and maintaining electrical isolation, thereby improving thermal management and operational efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymer encapsulation (BCB) is used to attach III-V materials to silicon substrates, then electrical isolation and dielectric properties are improved, but thermal resistance increases significantly
Solution Approach 1:
The encapsulation structure is segmented into multiple functional layers: a bottom polymer layer (BCB) for electrical isolation and bonding, and a top thermally conductive layer for heat dissipation. This segmentation allows each layer to optimize its specific function without compromising the other.
Solution Approach 2:
The device employs a composite encapsulation structure combining polymer materials (for electrical isolation) with thermally conductive materials (for heat management). This composite approach integrates the beneficial properties of different material classes to simultaneously address electrical and thermal requirements.
2Productivity
If device integration density is increased to meet bandwidth requirements, then communication capacity is improved, but heat flux density increases leading to thermal management issues
Solution Approach 1:
A thermally conductive encapsulation layer acts as an intermediary between the heat-generating laser device and the silicon substrate, facilitating efficient heat transfer while maintaining electrical isolation. This intermediary structure enables high-density integration by managing the thermal load.
Solution Approach 2:
The solution addresses thermal management by introducing a vertical thermal conduction path through the encapsulation layers, moving heat management from a planar constraint to a three-dimensional solution with dedicated thermal pathways.
3Use of energy by moving object
If laser operational temperature is reduced to improve efficiency and spectral output, then energy consumption decreases, but thermal management complexity increases
Solution Approach 1:
The thermally conductive encapsulation layer provides passive, continuous heat dissipation without requiring active cooling systems or complex thermal management circuitry. The structure itself performs the thermal management function through its inherent thermal conductivity.
Solution Approach 2:
The encapsulation material parameters are specifically selected to optimize thermal conductivity while maintaining electrical isolation properties. By changing the thermal parameters of the encapsulation layer, the system achieves improved heat dissipation without increasing complexity.
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
The solution significantly reduces thermal resistance, allowing for better temperature control and improved spectral output efficiency, enabling more efficient heat transfer and reduced energy consumption, thus enhancing the performance and reliability of photonic integrated circuits.
Implementation Method 1
a thermally conductive, electrically insulating coating adjacent a surface of the ridge-type hybrid laser; the coating being configured to transfer heat away from the laser
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3(a)~3(b)
AI summary
Aspects and embodiments relate to a device and method for providing a device. The device comprises: a ridge-type hybrid laser; and a thermally conductive, electrically insulating, coating adjacent a surface of the ridge-type hybrid laser; the coating being configured to transfer heat away from the laser. It will be appreciated that aspects and embodiments recognise that a thermal solution can be implemented to enable energy efficient, scalable, reliable and low cost cooling designs for integrated photonics devices. An arrangement in accordance with aspects and embodiments described herein can provide improved thermal performance of a hybrid ridge type laser device. Such improved thermal performance can facilitate better temperature control, and lower device temperature can result in better device performance and longer device lifetimes. Aspects and embodiments help to provide an integrated thermal approach which can deal with thermal spreading close to where heat on a device is generated within a laser waveguide.