Lasing Grid Structure With Current Confinement for High-Speed Laser Arrays
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Solution Overview
Problem
Existing high-speed laser arrays face issues with brittleness, low lasing power, and limited frequency response due to mesa structures, which lead to mechanical failures and reduced performance in applications like LiDAR and communications.
Innovation Solution
A single contiguous structure with ion-implanted or oxidized areas for current confinement, forming a grid of lasing points with reduced capacitance and increased structural integrity, integrated with a high-speed electrical waveguide for parallel signal distribution and improved heat management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If mesa structures are used to form laser arrays, then current confinement is improved, but structural brittleness increases leading to mechanical failures during bonding
Solution Approach 1:
The patent divides the single mesa structure into multiple laser regions by forming isolated conductive regions within the semiconductor layer. These regions are separated by non-conductive oxide layers that are selectively formed between the laser regions, creating current confinement without requiring separate mesa structures. This segmentation approach maintains structural integrity while achieving the current confinement benefits of mesa structures.
Solution Approach 2:
The patent introduces an intermediary oxide layer between adjacent laser regions to provide current confinement. This oxide layer acts as a mediator that electrically isolates adjacent laser regions while maintaining mechanical continuity of the semiconductor substrate. The oxide is formed selectively in regions between laser contacts, providing the necessary electrical isolation without creating brittle mesa structures.
2Ease of manufacture
If multiple separate mesas are used for laser array, then current isolation is improved, but capacitance increases reducing frequency response
Solution Approach 1:
The patent merges multiple laser regions into a single continuous semiconductor structure rather than using separate mesa structures. The laser regions are formed within a single semiconductor layer that remains mechanically and electrically connected, reducing the overall capacitance of the array. Current isolation between regions is achieved through selective oxide formation rather than physical separation, maintaining low capacitance while providing necessary electrical isolation for high-frequency operation.
3Ease of manufacture
If mesas are etched around each laser region, then current confinement is improved, but fill factor decreases due to spacing requirements
Solution Approach 1:
The patent applies local quality by forming oxide layers only in specific regions between laser contacts rather than etching mesas around each laser region. The oxide is selectively deposited or formed in the spaces between adjacent laser regions, providing current confinement only where needed. This approach eliminates the need for large spacing between lasers, maximizing the fill factor while maintaining effective current isolation between adjacent laser regions.
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 enhances the reliability, fill factor, and processing simplicity of laser arrays, enabling higher frequency and power operation while reducing mechanical failures and increasing integration with submounts.
Implementation Method 1
the implants create areas of the semiconductor material that are nonconductive
Implementation Method 2
areas of nonconductive oxidation through microstructures or holes
Data Source
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AI summary
Disclosed herein are various embodiments for stronger and more powerful high speed laser arrays. For example, an apparatus is disclosed that comprises (1) a single laser emitting epitaxial structure that comprises a plurality of laser regions, each laser region of the single laser emitting epitaxial structure being electrically isolated within the single laser emitting epitaxial structure itself relative to the other laser regions of the single laser emitting epitaxial structure, and (2) an electrical waveguide configured to provide current to the laser regions.