Hybrid III-V Silicon Micro-Ring Laser for High-Speed Data Transmission
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Solution Overview
Problem
Current technologies face challenges in transmitting large volumes of data at high speeds due to bandwidth bottlenecks, particularly in consumer electronics, where high-definition video and data storage are increasing exponentially, but transmission rates have not kept pace, leading to lengthy data transfer times.
Innovation Solution
A hybrid III-V-silicon micro-ring electrically pumped laser system is developed, utilizing wafer-bonding and a compact silicon micro-ring resonator with a PN junction and trapezoidal shaped buffer to achieve high-speed data transmission, enabling direct modulation at speeds greater than one gigahertz and efficient light confinement within the resonator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If data transmission speed is increased to keep up with exponential data growth, then data transfer time is reduced, but transmission cost increases significantly
Solution Approach 1:
The patent replaces traditional electronic data transmission with optical transmission using laser light. The micro-ring laser device generates coherent light that can be modulated to carry data signals, substituting electrical signals with optical signals to achieve higher transmission speeds and bandwidth while reducing cost per bit transmitted.
Solution Approach 2:
The patent utilizes the refractive index difference between the micro-ring resonator and surrounding materials to achieve light confinement and resonance. By carefully controlling the geometric parameters (ring radius, width) and material properties, the system achieves lasing action at specific wavelengths, enabling high-speed optical communication.
2Productivity
If laser devices are integrated onto chips for high-speed transmission, then bandwidth bottleneck is reduced, but chip space occupation increases
Solution Approach 1:
The patent divides the laser cavity into a compact micro-ring resonator structure that can be integrated alongside other photonic and electronic components on the chip. The ring geometry allows for efficient light confinement in a small footprint, enabling multiple laser devices to be packed densely on a single chip without excessive space occupation.
Solution Approach 2:
The micro-ring laser is designed to be nested within or adjacent to waveguide structures and other photonic components on the chip. The compact ring geometry allows the laser cavity to be embedded within the chip substrate or positioned in close proximity to other integrated components, maximizing space utilization.
3Device complexity
If wafer-bonding technique is used for hybrid III-V-silicon integration, then manufacturing complexity is reduced, but bonding precision requirements increase
Solution Approach 1:
The wafer-bonding process is designed to be self-aligning, where the micro-ring resonator structures on the III-V wafer automatically align with corresponding features on the silicon substrate during the bonding process. This self-alignment mechanism reduces the need for complex external alignment systems and minimizes the precision requirements for manual or automated alignment equipment.
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 solution allows for low-cost, high-speed data transmission, reducing bandwidth bottlenecks and enabling the integration of numerous laser-on-chip systems without significant space occupation, while providing high-quality laser light output with larger longitudinal-mode spacing and improved power efficiency.
Implementation Method 1
a micro-ring resonator (MRR) having a radius R and width W, where R and W are chosen such that the MRR confines light of a selected wavelength
Implementation Method 2
A PN junction is formed across the quantum well. A center electrode and a ring electrode are connected to the PN junction to provide a means of injecting carriers into the quantum well
Implementation Method 3
provide optical gain to light of the selected wavelength circulating within the MRR
Implementation Method 4
A quantum well is bonded to the first buffer layer. The quantum well is optically coupled to the MRR
Data Source
AI summary
A system and method for an electrically pumped laser system is disclosed. The system includes a silicon micro-ring resonator 405. A quantum well 412 formed of a III-V group semiconductor material is optically coupled with the micro-ring resonator 405 to provide optical gain. A trapezoidal shaped buffer 414 formed of a III-V group semiconductor material and doped with a first type of carrier is optically coupled to the quantum well 412. A ring electrode 410 is coupled to the trapezoidal shaped buffer 414. The trapezoidal shaped buffer 414 enables the ring electrode 410 to be substantially isolated from an optical mode of the micro-ring resonator 405.