Integrated Lidar Circulator for Photonic Chip Beam Alignment
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Solution Overview
Problem
Lidar systems face alignment issues between free space optics and photonic chips, which degrade their effectiveness in transmitting and receiving light beams, affecting the accuracy of object detection and parameter measurement.
Innovation Solution
A Lidar system that incorporates a photonic chip with a circulator to direct light beams, a microelectromechanical (MEMS) scanner for beam direction, and a single lens in free space, along with a local oscillator beam splitter and combiner, to enhance beam alignment and detection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If free space optics are used to direct light beams between transmission and reception locations, then beam direction is achieved, but alignment issues occur between free space optics and photonic chip locations
Solution Approach 1:
The circulator integrates multiple optical functions (beam direction, transmission, reception) into a single photonic chip component, eliminating the need for separate free space optics and their associated alignment issues. The circulator combines the functions of beam steering and optical path management that were previously distributed across multiple free space optical elements.
Solution Approach 2:
The circulator acts as an intermediary device that mediates between the laser source and the external environment, providing a stable, integrated interface that eliminates alignment sensitivity. By routing light through waveguides and internal reflective surfaces within the photonic chip, the circulator serves as a robust intermediary that decouples the sensitive alignment requirements from the external optical path.
2Adaptability or versatility
If separate locations are used for beam transmission and reception, then functional separation is achieved, but alignment issues between free space optics and locations occur
Solution Approach 1:
The circulator merges transmission and reception functions into a single integrated component on the photonic chip, while maintaining functional separation through internal optical path routing. The device allows simultaneous or sequential transmission and reception operations without requiring separate physical locations or complex free space optical paths.
3Adaptability or versatility
If multiple components are used in the optical path, then functional capabilities are enhanced, but alignment issues and system complexity increase
Solution Approach 1:
The circulator consolidates multiple optical functions (beam steering, transmission routing, reception routing, and optical path isolation) into a single integrated photonic chip component, significantly reducing system complexity while maintaining all necessary functional capabilities. This integration eliminates the need for multiple separate optical components and their associated alignment requirements.
Solution Approach 2:
The circulator serves multiple functions simultaneously: it directs transmitted beams from the laser, routes reflected beams to photodetectors, provides optical path isolation, and enables bidirectional light routing. This multi-functionality replaces what would traditionally require multiple specialized components, reducing overall system complexity.
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 configuration improves the alignment and detection accuracy of light beams, reducing alignment issues and enhancing the overall effectiveness of the Lidar system in measuring object parameters, such as distance and velocity.
Implementation Method 1
a circulator integrated into the photonic chip to direct the transmitted light beam toward the aperture and to direct the reflected light beam from the aperture to the one or more photodetectors
Implementation Method 2
a laser integrated into the photonic chip, the laser generating the transmitted light beam
Implementation Method 3
a microelectromechanical (MEMS) scanner that directs the transmitted light beam from the aperture towards a selected direction via and directs the reflected light beam received from the selected direction toward the aperture
Implementation Method 4
a single lens in free space located in front of the aperture through which the transmitted light beam and the reflected light beam pass
Data Source
AI summary
A vehicle, Lidar system and method of detecting an object is disclosed. The Lidar system includes a photonic chip having an aperture, one or more photodetectors and a circulator. A transmitted light beam generated within the photonic chip exits the photonic chip via the aperture and a reflected light beam enters the photonic chip via the aperture, the reflected light beam being a reflection of the transmitted light beam from the object. The one or more photodetectors measure the parameter of the object from at least the reflected light beam. The circulator integrated into the photonic chip directs the transmitted light beam toward the aperture and directs the reflected light beam from the aperture to the one or more photodetectors. A navigation system navigates the vehicle with respect to the object based on the parameter of the object.