Integrated LIDAR Modulator PIC With III-V and Silicon Photonics
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Solution Overview
Problem
Existing LIDAR systems face challenges in achieving high performance and efficiency due to limitations in semiconductor materials and manufacturing processes, particularly in the integration of group III-V semiconductor dies with silicon photonics dies.
Innovation Solution
The integration of co-packaged silicon photonics dies with group III-V semiconductor dies, where the group III-V die includes semiconductor devices such as modulators, preamplifiers, and amplifiers, coupled with a silicon photonics die that feeds a light beam to the channels of the group III-V die, forming a photonic integrated circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If group III-V semiconductor dies are integrated with silicon photonics dies, then optical transmission characteristics and efficiency are improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent integrates group III-V semiconductor amplifiers and modulators with silicon photonics waveguides onto a single photonic integrated circuit substrate. This merging of different semiconductor technologies enables direct coupling of optical signals between the group III-V components and silicon waveguides, improving optical transmission characteristics while maintaining a unified device structure that manages complexity through systematic integration.
2Ease of manufacture
If multiple semiconductor devices are integrated on the same die, then manufacturing cost is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent divides the photonic integrated circuit into distinct functional regions: group III-V semiconductor regions containing amplifiers and modulators, and silicon photonics regions containing waveguides. These segmented regions are selectively formed on different portions of the substrate, allowing each region to be optimized independently while reducing overall manufacturing complexity and cost through standardized fabrication processes.
Solution Approach 2:
The patent applies different semiconductor materials and fabrication techniques to different locations on the substrate. Group III-V semiconductor layers are formed in specific regions where amplification and modulation are needed, while silicon photonics waveguides are formed in other regions. This local differentiation of material properties and fabrication approaches enables cost-effective manufacturing while meeting precise alignment requirements through targeted processing.
3Measurement precision
If high-power light signals are generated, then LIDAR measurement accuracy is improved, but energy consumption increases
Solution Approach 1:
The patent integrates optical amplifiers within the photonic integrated circuit that continuously amplify optical signals as they propagate through the circuit. This continuous amplification maintains high optical power levels throughout the device without requiring periodic re-amplification, enabling accurate LIDAR measurements while optimizing energy efficiency by maintaining steady-state operation of the amplification process.
Solution Approach 2:
The patent uses group III-V semiconductor amplifiers as intermediary components that convert electrical pump energy into optical gain, mediating between the electrical power supply and the optical signal. These amplifiers efficiently transfer energy from the pump source to the signal wave, enabling high-power light generation for accurate LIDAR measurements while minimizing energy loss through optimized energy conversion 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 solution enhances the performance of LIDAR systems by reducing manufacturing costs, increasing efficiency, and improving optical transmission characteristics, enabling the generation of high-power light signals necessary for accurate distance and velocity measurements.
Implementation Method 1
The modulator can be configured to modulate phase and/or frequency of the light source such that the modulated beam can include a phase-modulated beam and/or a frequency-modulated beam
Implementation Method 2
The modulator can be configured to modulate phase and/or frequency of the light source such that the modulated beam can include a phase-modulated beam and/or a frequency-modulated beam
Implementation Method 3
The amplifier is configured to amplify the beam to produce an amplified beam
Data Source
AI summary
A light detection and ranging (LIDAR) sensor system for a vehicle can include: a light source configured to output a beam; a photonics integrated circuit (PIC) including a semiconductor die, the semiconductor die including a substrate having two or more semiconductor stacks respectively associated with two or more semiconductor devices formed on the substrate, the two or more semiconductor devices respectively configured to receive the beam from the light source and modify one or more features of the beam; a transmitter configured to receive the beam from the semiconductor die; and one or more optics configured to receive the beam from the transmitter and emit the beam towards an object.