Flip-Chip Laser Die Integration on Silicon Photonics
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Solution Overview
Problem
Integrated optoelectronic devices, such as Silicon Photonics (SiP) devices, face limitations in electrical performance due to wire bonding, which degrades signal integrity and limits signal bandwidth, and require improved heat dissipation from heat-generating components.
Innovation Solution
The development of an optoelectronic device with a trench formed in the surface of a SiP wafer, where a laser die is mounted, and electrically conductive bumps or a ball grid array are used to connect the laser die to a substrate, allowing for flip-chip assembly and improved heat dissipation through a heat sink.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wire bonding is used to connect optoelectronic components, then electrical connections can be established, but signal integrity degrades and signal bandwidth is limited due to intrinsic inductance and parasitic capacitance
Solution Approach 1:
The patent extracts and eliminates the wire bonding interconnect structure by directly integrating the laser die onto the SiP die using flip-chip technology. This removes the parasitic inductance and capacitance associated with wire bonds, thereby improving signal integrity and bandwidth while reducing structural complexity.
Solution Approach 2:
The patent merges the laser die and SiP die into a single integrated package using flip-chip mounting. The electrical interconnects are formed directly between corresponding pads on the laser die and SiP die, eliminating separate wire bonding steps and reducing overall device complexity while enhancing electrical performance.
2Productivity
If heat-generating components are integrated on SiP devices, then device functionality is achieved, but heat dissipation becomes insufficient
Solution Approach 1:
The patent implements a multi-functional heat sink structure that serves both as a thermal management solution and as part of the electrical interconnect system. The heat sink is thermally coupled to the laser die to conduct heat away, while also providing an electrical connection path, thereby addressing both heat dissipation and electrical connectivity needs simultaneously.
Solution Approach 2:
The patent introduces a heat sink as an intermediary component between the heat-generating laser die and the surrounding environment. This heat sink acts as a thermal conductor that facilitates heat transfer from the laser die, enabling effective heat dissipation while maintaining device functionality.
3Ease of operation
If traditional wire bonding methods are used, then electrical connections are established, but the device footprint is larger
Solution Approach 1:
The patent transitions from planar wire bonding connections to three-dimensional flip-chip mounting with vertical electrical interconnects. This dimensional change allows electrical connections to be made directly between opposing surfaces of the laser die and SiP die, significantly reducing the horizontal footprint while maintaining ease of electrical connection through standardized flip-chip processes.
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 configuration reduces intrinsic inductance and parasitic capacitance, enhancing electrical performance and heat dissipation, enabling high-speed signal exchange with high signal integrity and reduced footprint compared to traditional wire bonding methods.
Implementation Method 1
a heat sink coupled to an opposite surface of the optoelectronic die, which is opposite the surface having the trench, and is configured to conduct heat from the optoelectronic die
Implementation Method 2
an electrically conductive layer extends from the floor, via the first wall, to the surface. The first electrode is coupled to the electrically conductive layer
Implementation Method 3
The electrical interconnects are formed on the second electrode of the laser die and on selected locations on the surface of the optoelectronic die, the electrical interconnects are coupled to a substrate, and are configured to conduct electrical signals between the optoelectronic die and the substrate
Data Source
AI summary
An optoelectronic device includes an optoelectronic die, a laser die, and electrical interconnects. The optoelectronic device has a surface. A trench having first and second walls and a floor is formed in the surface, and an electrically conductive layer extends from the floor, via the first wall, to the surface. The laser die includes first and second electrodes and a laser output aperture. The laser die is mounted in the trench and is configured to emit a laser beam. The first electrode is coupled to the electrically conductive layer and the laser output aperture is mechanically aligned with a waveguide that extends from the second wall. The interconnects are formed on the second electrode of the laser die and on selected locations on the surface of the optoelectronic die. The interconnects are coupled to a substrate, and are configured to conduct electrical signals between the optoelectronic die and the substrate.