Tunable Laser Waveguide Isolation for LiDAR Thermal Stability
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Solution Overview
Problem
Tunable laser light sources used in LiDAR systems face performance degradation due to thermal issues, as existing designs lack effective thermal management, leading to heat transfer between optical amplifiers and resonators, which affects stability and reliability.
Innovation Solution
A tunable laser light source design incorporating a thermal isolation structure with a waveguide layer disconnected in specific areas to reduce thermal conductivity, along with a thermal management device for individual cooling of optical amplifiers and resonators, minimizing heat transfer and enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If optical amplifiers are placed close to each other on the waveguide layer, then device integration is improved, but thermal coupling between amplifiers increases causing performance degradation
Solution Approach 1:
The waveguide layer is divided into separate sections between adjacent optical amplifiers, creating isolated waveguide segments. This segmentation prevents thermal coupling while maintaining optical signal transmission, allowing amplifiers to be placed close together without thermal interference affecting performance stability
Solution Approach 2:
A thermal isolation structure is introduced between optical amplifiers to act as a thermal barrier. This intermediary structure blocks heat transfer between adjacent amplifiers while allowing the optical waveguide function to continue, thus maintaining both high integration and performance stability
2Use of energy by moving object
If the waveguide layer remains continuous between optical components, then optical signal transmission is maintained, but thermal conductivity increases causing heat transfer between components
Solution Approach 1:
The waveguide layer is modified locally between optical components to have different thermal properties than the optical transmission regions. By creating sections with reduced thermal conductivity in non-optical paths while maintaining continuous optical transmission paths, the structure allows optical signals to pass while blocking heat transfer between components
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 effectively reduces thermal coupling between optical components, improving the reliability and stability of the tunable laser light source by managing heat distribution efficiently, thereby maintaining performance over time.
Implementation Method 1
a thermal isolation structure that is disposed between the first optical amplifier and the second optical amplifier in the first direction, wherein, in the thermal isolation structure, the waveguide layer is disconnected in the first direction so that an upper surface of the substrate is exposed outside of the waveguide layer
Data Source
AI summary
A tunable laser light source includes a substrate; a waveguide layer disposed on the substrate, and including: a first optical waveguide and a second optical waveguide that are spaced apart from each other in a first direction and that extend in a second direction perpendicular to the first direction; a first optical amplifier provided on the first optical waveguide; a second optical amplifier provided on the second optical waveguide and facing the first optical amplifier at a distance in the first direction; and a thermal isolation structure that is provided between the first optical amplifier and the second optical amplifier in the first direction, wherein, in the thermal isolation structure, the waveguide layer is disconnected in the first direction such that an upper surface of the substrate is exposed outside of the waveguide layer.