LIDAR Steering via Photonic Integrated Circuit Waveguides
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Solution Overview
Problem
Current LIDAR systems face challenges in achieving practical solid-state scanning mechanisms with wide angular ranges and reduced complexity, particularly for applications like ADAS and AR, where mechanical methods are inefficient and existing solid-state approaches require numerous control elements.
Innovation Solution
A LIDAR system incorporating a Photonic Integrated Circuit (PIC) with a solid-state steering mechanism using an optical switch, alternate waveguides, and a redirection component, allowing for directional control of LIDAR output signals without moving parts, enabling scanning across multiple sample regions with increased angular range and reduced complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mechanical scanning methods (rotating assembly, mechanical mirrors) are used, then scanning capability is achieved, but device complexity and inefficiency increase
Solution Approach 1:
The patent replaces mechanical scanning components (rotating assemblies, mechanical mirrors) with a solid-state optical phased array system that uses electrical phase control to steer beams. This substitution eliminates moving parts while maintaining scanning functionality, directly resolving the contradiction between scanning capability and device complexity.
Solution Approach 2:
The patent implements dynamic beam steering through electronic phase modulation of the optical phased array elements. By dynamically adjusting phase shifts in real-time, the system achieves agile scanning without mechanical movement, transforming static mechanical scanning into dynamic electronic control.
2Device complexity
If solid-state approaches (Optical Phased Arrays) are used, then lack of moving parts is achieved, but angular range is limited and control element count increases
Solution Approach 1:
The patent divides the optical phased array into multiple independent controllable elements or element groups. This segmentation allows each segment to be controlled independently, enabling a wider effective angular range by combining the steering capabilities of individual segments while reducing the complexity of any single control element.
Solution Approach 2:
The patent extends the angular range by utilizing multiple dimensions of phase control simultaneously. Instead of adjusting phase in a single dimension, the system employs multi-dimensional phase modulation across the array, enabling broader angular coverage without proportionally increasing control element complexity.
3Device complexity
If existing solid-state scanning mechanisms are used, then no moving parts is achieved, but scanning speed is limited
Solution Approach 1:
The patent employs periodic phase modulation patterns that rapidly cycle through different beam directions. By using periodic switching between multiple phased array configurations, the system achieves high-speed scanning through electronic switching rather than mechanical motion, overcoming the speed limitations of conventional solid-state approaches.
Solution Approach 2:
The patent rapidly changes the phase and amplitude parameters of the optical phased array elements to steer the beam at high speeds. By dynamically adjusting these electrical parameters in real-time, the system achieves scanning speeds limited only by electronic switching capability rather than mechanical inertia.
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 provides a practical and efficient solid-state scanning mechanism for LIDAR systems, enhancing angular range and reducing complexity, making it suitable for various applications by directing LIDAR output signals effectively across multiple sample regions.
Implementation Method 1
The redirection component receives an outgoing LIDAR signal from any one of multiple alternate waveguides
Implementation Method 2
The LIDAR output signal includes light from the outgoing LIDAR signal
Data Source
AI summary
A LIDAR system includes a LIDAR chip configured to output a LIDAR output signal. The LIDAR chip includes a redirection component and alternate waveguides. The redirection component receives an outgoing LIDAR signal from any one of multiple alternate waveguides. The LIDAR output signal includes light from the outgoing LIDAR signal. A direction that the LIDAR output signal travels away from the LIDAR chip is a function of the alternate waveguide from which the redirection component receives the outgoing LIDAR signal.