Edge-Emitting Laser Diode Layout for PIC Flip-Chip Alignment
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Solution Overview
Problem
Existing edge emitting semiconductor laser diodes are difficult to integrate with photonic integrated circuits, and the manufacturing process is complex.
Innovation Solution
A simplified method for producing a semiconductor laser diode with a flip-chip design that allows for easy integration with photonic integrated circuits, utilizing a ridge waveguide and electrical contact layers arranged in a common plane, and a self-aligned process using alignment structures for precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional semiconductor laser diode structure is used, then laser radiation is generated, but integration with photonic integrated circuit is difficult
Solution Approach 1:
The semiconductor laser diode is divided into functionally independent layers (first semiconductor layer, active region, second semiconductor layer) that can be separately optimized and integrated. The ridge waveguide is also segmented as a distinct structural element, allowing modular integration with photonic circuits.
Solution Approach 2:
The patent transitions from planar electrode arrangement to three-dimensional stacked contact layers. The first electrical contact layer is positioned on the main surface while the second electrical contact layer is positioned on the ridge waveguide, creating vertical stacking that enables co-planar mounting surfaces for photonic circuit integration.
2Ease of manufacture
If conventional manufacturing process is used, then semiconductor laser diode is produced, but manufacturing process is complex
Solution Approach 1:
Alignment structures are pre-formed on both the semiconductor laser diode and the photonic integrated circuit before the bonding process. This preliminary preparation enables self-alignment during bonding, eliminating the need for complex post-bonding alignment procedures and simplifying the overall manufacturing process.
Solution Approach 2:
The alignment structures automatically guide the positioning of the semiconductor laser diode relative to the photonic integrated circuit during the bonding process. The system uses its own built-in alignment features rather than requiring external alignment equipment or complex alignment procedures.
3Manufacturing precision
If precise alignment is achieved, then light exit and entrance areas are accurately aligned, but alignment process becomes complex
Solution Approach 1:
The alignment structures automatically guide the positioning of the semiconductor laser diode relative to the photonic integrated circuit during the bonding process. The system uses its own built-in alignment features rather than requiring external alignment equipment or complex alignment procedures.
Solution Approach 2:
Alignment structures are pre-formed on both the semiconductor laser diode and the photonic integrated circuit before the bonding process. This preliminary preparation enables self-alignment during bonding, eliminating the need for complex post-bonding alignment procedures and simplifying the overall manufacturing process.
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
Facilitates easy integration and precise alignment of the semiconductor laser diode with photonic integrated circuits, reducing manufacturing complexity and ensuring high accuracy in the alignment of light exit and entrance areas.
Implementation Method 1
an active region (5) arranged between the first semiconductor layer (3) and the second semiconductor layer (4) and configured for generating electromagnetic laser radiation (6)
Implementation Method 2
a ridge waveguide (8) in a main surface (9) of the semiconductor layer sequence (2)... configured for guiding the electromagnetic laser radiation
Data Source
AI summary
An edge emitting semiconductor laser diode includes a semiconductor layer sequence having a first semiconductor layer of a first conductivity type and a second semiconductor layer of a second conductivity type and an active region for generating electromagnetic laser radiation during operation, a ridge waveguide in a main surface of the semiconductor layer sequence, a first electrical contact layer on the main surface of the semiconductor layer sequence, and a second electrical contact layer on the ridge waveguide. The active region is between the first semiconductor layer and the second semiconductor layer. The first electrical contact layer electrically contacts the first semiconductor layer. The second electrical contact layer electrically contacts the second semiconductor layer. The first electrical contact layer is on the second electrical contact layer, such that electrical mounting areas of the edge emitting semiconductor laser diode are arranged in a common plane.