WDM LiDAR Optical Path Merging for Compact Scanning
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Solution Overview
Problem
Conventional LiDAR systems are bulky, heavy, and costly due to the need for multiple lasers and complex optics to achieve a wide field of view, which complicates alignment and increases mechanical failures.
Innovation Solution
The implementation of wavelength division multiplexed (WDM) LiDAR systems that use a combination of optical transmitter and receiver modules, beamforming units, and optical circulators to project and detect light at multiple wavelengths, reducing the number of components and complexity by sharing optics and using a single driving circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple lasers and complex optics are used to achieve a wide field of view, then the field of view coverage is improved, but the system weight and device complexity increase
Solution Approach 1:
The patent combines multiple laser sources operating at different wavelengths into a single integrated optical system. Multiple lasers are coupled through optical fibers to a common beam forming unit, merging their outputs into a single optical path. This consolidation achieves wide field of view coverage through wavelength division multiplexing while reducing overall system weight by eliminating redundant optical components and housing structures that would be required for separate laser systems.
Solution Approach 2:
The beam forming unit and optical circulator serve multiple functions simultaneously: they handle both transmission of probe light to multiple wavelengths and reception of reflected light across the same optical path. The optical circulator acts as a universal component that directs light flow in different directions based on wavelength, enabling a single optical path to perform both sensing and receiving functions, thereby reducing system weight.
2Adaptability or versatility
If multiple lasers and complex optics are used to achieve a wide field of view, then the field of view coverage is improved, but the device complexity and alignment difficulty increase
Solution Approach 1:
The patent merges multiple laser sources into a single optical path using wavelength division multiplexing. Instead of maintaining separate optical paths for each laser, the system combines all laser outputs through optical fibers into a common beam forming unit, significantly reducing the number of optical components and alignment points required.
Solution Approach 2:
Optical fibers serve as intermediaries that transmit light from multiple laser sources to the beam forming unit without requiring direct optical alignment between lasers and the beam forming components. The fibers act as flexible connectors that simplify the optical path setup and reduce alignment complexity.
3Adaptability or versatility
If extensive mechanical movement is used for scanning, then the field of view coverage is improved, but the mechanical failure rate increases
Solution Approach 1:
The patent replaces extensive mechanical scanning movements with an electro-optical approach. The beam forming unit uses electronic control to direct probe light across different angular positions without requiring large-scale mechanical rotation or movement of the entire LiDAR system. This substitution of mechanical scanning with electro-optical beam steering maintains wide field of view coverage while significantly improving reliability by eliminating mechanical wear and failure points.
4Measurement precision
If multiple separate optical systems are used for different wavelengths, then the wavelength detection capability is improved, but the cost and component quantity increase
Solution Approach 1:
The patent merges multiple wavelength detection capabilities into a single optical path using wavelength division multiplexing. The optical circulator and beam forming unit handle multiple wavelengths simultaneously through the same physical components, eliminating the need for separate optical systems for each wavelength and thereby reducing component quantity while maintaining detection precision.
Solution Approach 2:
The optical circulator and beam forming unit serve as universal components that handle multiple wavelengths simultaneously. These components are designed to work across a broad spectral range, enabling a single set of optical components to perform the function of what would traditionally require multiple wavelength-specific systems, thus reducing overall component quantity.
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 approach results in a more compact, lightweight, and cost-effective LiDAR system with improved scanning capabilities and reduced mechanical failures, allowing for efficient coverage of a wide field of view without the need for extensive mechanical movement.
Implementation Method 1
an optical diffraction grating aligned relative to the optical collimator to transmit light therebetween so that the combined optical beam is received by the optical collimator and is directed by the optical collimator to the optical diffraction grating that separates the combined optical beam into different optical probe beams at different directions at the different WDM wavelengths
Implementation Method 2
an optical circulator coupled to the optical fiber link, the optical transmitter module, the optical receiver module and the optical beamforming module to direct light from the optical transmitter module to the optical beamforming module, light from the beamforming module to the optical receiver module
Implementation Method 3
an optical receiver module coupled to receive returned probe light via the fiber link from the optical beamforming module and including a WDM demultiplexer to separate the returned probe light into the different returned optical probe beams at the different WDM wavelengths
Implementation Method 4
different optical detectors that are placed to receive and detect the different returned optical probe beams at the different WDM wavelengths
Data Source
AI summary
Designs and implementations of light detection and ranging (LiDAR) systems that project light at a set of different wavelength division multiplexed (WDM) wavelengths based on WDM optical designs to reduce the number of components, complexity of LiDAR optical systems, the weight and cost of LiDAR systems for a wide range of applications.