Modular 3D Optical Sensing With PIC Beam Steering for Vehicle LiDAR
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Solution Overview
Problem
Existing LIDAR systems face challenges in scalability, high manufacturing costs, and technical difficulties in implementing optical phased arrays for beam steering, particularly in long-range high-resolution 3D imaging, due to the complexity of mechanical parts and the need for precise beam control.
Innovation Solution
A modular photonic integrated circuit (PIC) architecture with fiber optic connections, utilizing silicon photonics for beam steering units and coherent detection, enabling dynamic beam shaping and scanning without mechanical parts, and incorporating frequency chirped light beams for improved resolution and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mechanical scanning mirrors or rotating heads are used for beam steering, then beam direction control is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent replaces mechanical scanning mirrors and rotating heads with an optical phased array system that uses electronic phase modulation of light waves to achieve beam steering. Multiple light sources are arranged in an array, and by controlling the phase of each element, the beam direction can be changed without any mechanical moving parts, thus resolving the contradiction between beam direction control and device complexity
Solution Approach 2:
The patent introduces an optical phased array as an intermediary system between the light sources and the target. This array uses phase modulation to indirectly control beam direction, replacing direct mechanical steering and reducing the need for complex mechanical components
2Measurement precision
If InGaAs high speed detector arrays are used for pixel level time gating, then detection precision is improved, but manufacturing cost and difficulty increase
Solution Approach 1:
The patent uses standard silicon photodetectors instead of expensive InGaAs detector arrays. By combining these lower-cost detectors with the optical phased array's ability to perform time gating through phase modulation, the system achieves the required detection precision while dramatically reducing manufacturing complexity and cost
3Device complexity
If optical phased arrays are implemented for beam steering, then device complexity is reduced, but technical difficulties in beam control increase
Solution Approach 1:
The patent divides the optical system into multiple discrete light sources arranged in an array. Each element can be independently phase-modulated, allowing precise control of the overall beam pattern through constructive and destructive interference. This segmentation approach simplifies the mechanical structure while providing fine-grained control over beam direction and shape
Solution Approach 2:
The patent controls beam direction by changing the phase parameter of each light source in the array rather than using mechanical movement. By modulating the phase of individual elements, the system achieves precise beam steering through wave interference patterns, transforming a mechanical control problem into an electronic parameter control problem
4Adaptability or versatility
If wide-angle illumination is used for short-range imaging, then field of view is improved, but power density on target decreases
Solution Approach 1:
The patent implements dynamic beam shaping and steering capabilities through the optical phased array. The system can dynamically adjust the illumination pattern, switching between wide-angle illumination for short-range imaging and focused narrow beams for long-range applications. This dynamic adaptability allows the system to optimize power density while maintaining versatility across different ranging distances
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 proposed system achieves scalable, reliable, and cost-effective 3D imaging by integrating optical phased arrays on a silicon photonics platform, reducing complexity and enhancing beam control capabilities for long-range applications.
Implementation Method 1
utilizing silicon photonics for beam steering units and coherent detection, enabling dynamic beam shaping and scanning without mechanical parts
Implementation Method 2
incorporating frequency chirped light beams for improved resolution and efficiency
Implementation Method 3
utilizing silicon photonics for beam steering units and coherent detection
Implementation Method 4
the distance-correlated phase or frequency shift in the target scattered signal with respect to the original signal can be measured
Implementation Method 5
the ability to control the shape of the outgoing optical beam
Implementation Method 6
utilizing silicon photonics for beam steering units
Data Source
AI summary
Examples of a three-dimensional (3D) optical sensing system for a vehicle include a modular architecture. Light can be transmitted to an optical signal processing module, which can include a photonic integrated circuit (PIC) that can create one or more signals with tailored amplitude, phase, and spectral characteristics. The plurality of optical signals processed by the optical signal processing module can be sent to beam steering units distributed around the vehicle. The steering units can direct a plurality of optical beams towards targets. The return optical signal can be detected by a receiver PIC including an array of sensors and using a direct intensity detection technique or a coherent detection technique. The return optical signal can be converted into an electrical signal by the array of sensors, which can then be processed by the electronic signal processing unit, and information about the location and speed of the targets can be quantified.