HCSEL Polymer Light Guide Coplanar MPD Packaging
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Solution Overview
Problem
The existing integration of semiconductor lasers with monitoring photodetectors requires complex three-dimensional packaging, which is costly and inefficient, particularly due to the need for angled mounting and wirebonding in multiple planes.
Innovation Solution
A two-dimensional packaging approach is implemented using a Horizontal Cavity Surface Emitting Laser (HCSEL) with its output and rear facets at specific angles, allowing for parallel mounting of the HCSEL and the monitoring photodetector (MPD) on a single plane, where a polymer light guide directs light from the rear facet to the MPD, simplifying the packaging process and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If three-dimensional packaging with angled mounting is used to integrate semiconductor laser with MPD, then light monitoring function is achieved, but packaging complexity and cost increase
Solution Approach 1:
The patent transitions from three-dimensional angled mounting to two-dimensional coplanar mounting by changing the laser facet orientation from perpendicular to parallel with the substrate. This dimensional simplification eliminates the need for complex wirebonding in multiple planes while maintaining the light monitoring function through the polymer light guide.
Solution Approach 2:
The patent introduces a polymer light guide as an intermediary component between the laser rear facet and the MPD. This mediator enables light transmission in a simplified two-dimensional configuration, replacing the direct optical path required in traditional three-dimensional packaging while achieving the same monitoring function with reduced complexity.
2Reliability
If three-dimensional packaging with multiple wirebonds is used, then electrical connections are established, but manufacturing time and cost increase
Solution Approach 1:
The patent merges the mounting planes of the laser and MPD into a single coplanar configuration. This consolidation reduces the number of wirebonding operations required, as all connections can be made in one plane rather than requiring complex three-dimensional wirerouting, thereby improving manufacturing efficiency.
Solution Approach 2:
By changing from three-dimensional to two-dimensional packaging, the patent simplifies the wirebonding process from multiple planes to a single plane, reducing manufacturing steps and increasing productivity while maintaining reliable electrical connections.
3Reliability
If laser is mounted at angle relative to MPD, then light can be directed to detector, but manufacturing precision requirements increase
Solution Approach 1:
The patent eliminates the need for precise angular mounting by transitioning to a coplanar two-dimensional configuration. The laser and MPD are mounted on the same plane with the laser facet parallel to the substrate, removing angular alignment requirements and significantly reducing manufacturing precision demands while maintaining effective light coupling through the polymer light guide.
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
This approach simplifies the packaging process, reduces costs, and enables effective monitoring of the laser light by the MPD through a straightforward, two-dimensional configuration, enhancing the integration of semiconductor lasers and photodetectors.
Implementation Method 1
A polymer is deposited over the rear facet of the HCSEL and the MPD detector surface. This polymer is cured, creating a light guide. The light from the rear facet of the HCSEL is directed to the detector surface of the MPD through the light guide.
Data Source
AI summary
A surface emitting laser (100) and a monitoring photodetector (MPD) 158 are mounted in a TO (transistor outline package) can (150) on the same plane as one another. Light from a rear facet (108) of the laser is directed to the MPD through a polymer light guide (164).