Optical Circuit Thermal Management via Diamond Over Cladding
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Solution Overview
Problem
In optical circuit devices, temperature inconsistencies caused by joule heating due to current flow lead to poor signal reliability and degraded modulation capabilities, as the refractive index of semiconductor core materials changes with temperature variations.
Innovation Solution
A thermally controlled optical circuit design featuring a waveguide between a base cladding and an over cladding, where the over cladding is made of a high thermal conductivity dielectric material, such as diamond, to distribute heat evenly and maintain consistent temperatures along the optical pathway, thereby reducing temperature variations and enhancing signal modulation reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If current flow is used for signal modulation in the waveguide, then modulation capability is improved, but temperature inconsistency increases due to joule heating
Solution Approach 1:
A thermally conductive layer is introduced as an intermediary component between the waveguide and the substrate. This layer acts as a heat transfer mediator that conducts away joule heating generated during signal modulation, preventing temperature buildup while allowing the modulation function to continue operating.
Solution Approach 2:
The harmful thermal effect (joule heating) is extracted and separated from the modulation function by introducing a dedicated thermal management layer. This layer specifically addresses the temperature inconsistency problem without interfering with the electrical modulation capability of the waveguide.
2Temperature
If high thermal conductivity material is used for over cladding, then temperature consistency is improved, but device complexity increases
Solution Approach 1:
The thermal conductivity parameter of the over cladding material is changed from standard dielectric values to high thermal conductivity values. This parameter change enables effective heat distribution and temperature consistency without requiring complex active cooling systems or multiple functional layers.
Data Source
AI summary
Controlling temperatures in optical circuits includes using a device with a waveguide located between a base cladding and an over cladding. The base cladding is deposited over a substrate and the over cladding is made of a thermally conductive dielectric material.