Hybrid Laser Evanescent Coupling for SOI CMOS Integration
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Solution Overview
Problem
Current silicon photonics hybrid laser systems face challenges in achieving efficient and compact designs with low power consumption, due to limitations in alignment requirements, material confinement factors, and integration with optical networks.
Innovation Solution
A hybrid laser design utilizing CMOS technology to define critical parts of the laser cavity, including gratings and reflectors, with an evanescent coupling interface between passive and active waveguides, allowing for efficient radiation coupling and reduced footprint, and enabling better control over wavelength and gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If fiber coupling an external packaged laser to the silicon chip is used, then thermal isolation is improved, but footprint and coupling cost increase
Solution Approach 1:
The patent merges the laser source with the silicon photonic chip through hybrid integration, combining the III-V laser die with the silicon waveguide platform. This integration eliminates the need for external fiber coupling while maintaining thermal isolation through the bonded interface, thereby reducing footprint without sacrificing thermal management.
2Adaptability or versatility
If individual laser dies are flip chip mounted to the optical wafer, then integration is improved, but alignment complexity increases
Solution Approach 1:
The patent implements preliminary alignment features during the fabrication process, including pre-defined alignment marks and registration structures on both the III-V laser die and silicon wafer. This preliminary preparation enables accurate alignment through standard bonding processes without requiring complex real-time alignment systems, thus achieving high integration with manageable manufacturing precision.
3Loss of energy
If evanescent coupling interface is used between waveguides, then coupling efficiency is improved, but confinement factor decreases
Solution Approach 1:
The patent optimizes the evanescent coupling interface by carefully controlling the gap distance, waveguide dimensions, and material composition at the bonding interface. By adjusting these parameters, the system achieves efficient power transfer through evanescent coupling while maintaining sufficient optical confinement in the active region to ensure adequate gain for laser operation.
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 results in a compact, efficient hybrid laser with improved wavelength accuracy and reduced power consumption, suitable for integrated photonic circuits and applications requiring high data bandwidth and miniaturization.
Implementation Method 1
an evanescent coupling interface is defined between the second optical waveguide and the first optical waveguide for coupling radiation from the second optical waveguide to the first optical waveguide
Data Source
Figure 1~2A
Figure 2B~2C
Figure 3A~3B
AI summary
A hybrid laser (100) is described for generating radiation, the hybrid laser (100) comprising an optical passive material (110) and an optical active material (120). The hybrid laser (100) furthermore comprises a first optical waveguide (112) and optical laser components (114) comprising reflectors in the optical passive material (110). The first optical waveguide (112) is adapted for coupling out radiation from the hybrid laser. The laser also comprises a second optical waveguide (122) defined in the optical active material (120). The optical laser components (114) comprise reflectors defining a cavity and furthermore are adapted for providing laser cavity confinement in the first optical waveguide (112) and the second optical waveguide (122). The second optical waveguide (122) thereby is positioned at least partly over the first optical waveguide (112) so that an evanescent coupling interface is defined between the second optical waveguide (122) and the first optical waveguide (112) and the evanescent coupling interface is positioned within the laser cavity.