Optical Phased Array Beam Steering for LiDAR
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Solution Overview
Problem
Current LiDAR systems face challenges in reliability, size reduction, and cost-effectiveness due to mechanical beam steering and modular assembly, which limits their performance in applications like autonomous vehicles.
Innovation Solution
An optical phased array (OPA) with a cascading structure of splitters and phase shifters is integrated with a wavelength-tunable laser diode and receiver on a bulk-silicon substrate, enabling efficient beam steering by splitting and phase-shifting optical signals for precise direction control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mechanical beam steering is used in LiDAR systems, then beam direction control is achieved, but system size and complexity increase
Solution Approach 1:
The patent replaces mechanical beam steering components with an optical phased array that uses phase shifters to control beam direction. Instead of physically moving mirrors or lenses, the system electronically adjusts the phase of light waves at each antenna element to steer the beam, eliminating mechanical parts and reducing system complexity while maintaining beam direction control capability
Solution Approach 2:
The patent divides the beam steering function into multiple independent phase shifters, each controlling a specific antenna element. This segmentation allows independent control of each element's phase, enabling precise beam direction control through coordinated adjustment of multiple simple components rather than one complex mechanical steering mechanism
2Ease of operation
If modular assembly with multiple antennas is used, then beam steering capability is achieved, but system size increases
Solution Approach 1:
The patent merges multiple antenna elements and their associated phase shifters into a single integrated optical phased array structure. All components are combined on one chip, allowing the system to achieve beam steering capability through coordinated operation of multiple elements while occupying minimal space, thus resolving the contradiction between steering capability and system size
3Adaptability or versatility
If conventional LiDAR systems are assembled with multiple components, then functionality is achieved, but manufacturing cost increases
Solution Approach 1:
The patent combines the laser source, optical phased array with multiple antennas, and receiver into a single integrated chip. This merger eliminates the need for complex assembly of multiple separate components, significantly reducing manufacturing cost while preserving full LiDAR functionality including laser emission, beam steering, and signal detection
Solution Approach 2:
The integrated chip performs multiple functions: it generates laser light, steers the beam in multiple directions, and detects reflected signals. This multi-functionality in a single component replaces what would otherwise require several separate components, reducing both manufacturing complexity and cost while maintaining complete LiDAR operational capability
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 OPA enhances beam steering reliability, reduces system size, and lowers costs by using fewer phase shifters, resulting in a compact, cost-effective LiDAR system suitable for autonomous navigation.
Implementation Method 1
a wavelength-tunable laser diode (LD), an optical phased array (OPA)
Implementation Method 2
configured for beam steering that may be included in LiDAR systems
Implementation Method 3
a plurality of sets of first phase shifter (PSs)... Each set of first PSs may be located exclusively on a first output end of each splitter
Implementation Method 4
Each splitter may be configured to split an input optical signal in a ratio of 1:1 and output the split input optical signal
Implementation Method 5
Light detection and ranging (LiDAR) is a method for measuring the presence and movement of objects... by using laser light, and is also known as laser radar
Data Source
AI summary
An optical phased array (OPA) may be included in a light detection and ranging (LiDAR) system and may be configured to perform beam steering. The OPA may include a cascading structure of splitters configured to enable a branch operation to be performed M times. Each splitter may split an input optical signal in a ratio of 1:1 and output the split input optical signal. The OPA may include a plurality of sets of first phase shifters (PSs), each set of first PSs located exclusively on one output end of a separate splitter, each set of first PSs including a particular quantity of first PSs based on a branch position at which the separate splitter is located. The OPA may be included in a LiDAR system that is further included in a vehicle that is configured to enable navigation of the vehicle, including autonomous navigation, through an environment.