Photonic Integrated Circuit Wavelength Multiplexing LIDAR
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Solution Overview
Problem
Coherent LIDAR systems face limitations in data rate and range due to time-of-flight constraints and speckle effects, which reduce their performance in detecting targets, and Photonic Integrated Circuits (PICs) are limited in scalability and cost, hindering their application in autonomous vehicles.
Innovation Solution
A photonic integrated circuit with multiple parallel light paths and a grating structure that uses wavelength multiplexing to increase the number of vertical resolution elements, enabling high data rates and long-range detection while mitigating the effects of time-of-flight and speckle, by branching light into multiple paths and using a diffraction grating to guide electromagnetic radiation, allowing for increased sampling and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple measurements are integrated to mitigate speckle, then target detection reliability is improved, but data rate is reduced
Solution Approach 1:
The patent segments the detection process by using multiple parallel optical channels (spatial segmentation) and wavelength divisions (spectral segmentation). Each channel performs independent measurements simultaneously, eliminating the need for sequential integration while achieving speckle mitigation through diversity. This allows maintaining high data rates while improving detection reliability through multiple independent sampling paths.
2Measurement precision
If the number of vertical channels is increased to improve optical resolution, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent transitions from increasing vertical channels in one dimension to using wavelength multiplexing in the spectral dimension. By assigning different wavelengths to different spatial positions through a grating structure, the system achieves high optical resolution without proportionally increasing the complexity of vertical channel integration. This dimensional shift allows scaling resolution while managing device complexity.
Solution Approach 2:
The patent creates a multi-functional system where a single PIC device handles multiple functions: wavelength multiplexing, spatial beam formation, signal detection, and speckle mitigation all within one integrated platform. This universal approach allows one device to replace what would traditionally require multiple separate components, reducing overall system complexity while achieving high optical resolution.
3Measurement precision
If wavelength multiplexing is used to increase vertical resolution elements, then optical resolution is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent merges the wavelength multiplexing function with the spatial beam formation function into a single integrated grating structure on the PIC. By combining these functions rather than implementing them as separate aligned components, the system reduces the cumulative alignment tolerances that would otherwise be required. The integrated design ensures that wavelength-to-spatial mapping is achieved through monolithic fabrication rather than multi-component assembly.
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 solution enhances the performance of coherent LIDAR systems by achieving high optical resolution, high data rates, and long-range detection, making them suitable for autonomous vehicle applications while reducing costs through scalable PIC design.
Implementation Method 1
at least one optical splitter to branch light received at the at least one light receiving input to a first light path and a second light path
Implementation Method 2
at least one amplifier structure to amplify light in the light path to provide amplified light
Implementation Method 3
at least one photo detector to detect light from outside of the photonic integrated circuit
Implementation Method 4
using a diffraction grating to guide electromagnetic radiation
Data Source
AI summary
A photonic integrated circuit, comprising a semiconductor photonic substrate having integrated therein: at least one light receiving input; at least one optical splitter to branch light received at the at least one light receiving input to a first light path and a second light path; wherein, the photonic integrated circuit, in the first light path, includes: at least one first amplifier structure to amplify the light in the first light path to provide first amplified light; at least one first light output to output the first amplified light from the at least one first amplifier structure; and at least one first photo detector to receive light from the outside of the photonic integrated circuit, the at least one first photo detector being located next to the at least one first light output; wherein, the photonic integrated circuit, in the second light path, includes: at least one second amplifier structure to amplify the light in the second light path to provide second amplified light; at least one second light output to output the second amplified light from the at least one second amplifier structure; and at least one second photo detector to receive light from the outside of the photonic integrated circuit, the at least one second photo detector being located next to the at least one second light output.