Optical Phased Array Radiator Segmented Electrodes
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Solution Overview
Problem
The existing LiDAR radiator technology faces issues with non-uniform temperature distribution and phase imbalance due to physical structure and resistance variations, leading to instability and degradation in beam performance, particularly in achieving a wide horizontal viewing angle and maintaining durability.
Innovation Solution
The optical phased array (OPA) radiator design includes silicon unit radiators with parallel electrodes and high-concentration doping regions, where the electrodes and doping regions are strategically arranged to ensure uniform temperature adjustment and minimize resistance imbalance, allowing for efficient vertical beam steering with improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the overall width of the grating radiator array is increased to achieve better performance and wider horizontal viewing angle, then the radiation performance is improved, but the resistance imbalance occurs due to process error and the distance between electrodes increases
Solution Approach 1:
The patent divides the grating radiator array into multiple segments with separate heating control. Each segment has its own heating electrode and can be controlled independently, allowing compensation for resistance imbalances across different regions of the array. This segmentation enables each section to be optimized separately while maintaining overall system performance.
Solution Approach 2:
The patent implements local quality control by providing different heating powers to different regions of the grating radiator array based on their specific resistance characteristics. This allows each local region to be optimized for its particular conditions, compensating for process variations and maintaining uniform temperature distribution across the entire array despite size increases.
2Adaptability or versatility
If the distance between electrodes is increased to accommodate wider grating radiator array, then the horizontal viewing angle is improved, but the resistance of the grating radiator array increases requiring higher voltage
Solution Approach 1:
By segmenting the heating system into multiple independent zones, each with its own electrode and control circuitry, the patent reduces the voltage requirement for each individual electrode. This allows the overall array to achieve wide horizontal viewing angle while maintaining manageable voltage levels through distributed, lower-power heating elements.
Solution Approach 2:
The patent applies heating power selectively to specific regions rather than uniformly across the entire array. This partial action approach allows optimal heating of critical regions while reducing overall power consumption and voltage requirements, enabling wide viewing angles without excessive voltage demands.
3Temperature
If higher voltage is applied to heat the grating radiator array, then the temperature adjustment is improved, but non-uniformity in temperature occurs due to resistance imbalance
Solution Approach 1:
The patent segments the heating system into multiple independently controlled zones, each with its own electrode and heating power control. This allows precise temperature adjustment in each region while maintaining overall temperature uniformity, eliminating the non-uniformity problems that occur with single high-voltage heating approaches.
Solution Approach 2:
The patent dynamically adjusts heating parameters (voltage, current, power distribution) for each segmented region based on real-time temperature feedback and resistance measurements. This parameter optimization enables effective temperature control while preventing non-uniformity, allowing good temperature adjustment capability without sacrificing temperature distribution uniformity.
4Productivity
If the grating radiator array is increased in size for better performance, then the radiation capability is improved, but the probability of resistance imbalance due to process error increases
Solution Approach 1:
By dividing the large-grating radiator array into multiple smaller, independently controlled segments, the patent reduces the impact of process errors on any single region. Each segment can be optimized and controlled separately, improving overall reliability while maintaining the large array's high radiation capability.
Solution Approach 2:
The patent implements feedback control mechanisms that monitor resistance and temperature in each segment, allowing real-time compensation for process variations. This feedback system maintains resistance balance stability across the entire array despite size increases, ensuring reliable operation while preserving high radiation 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
This design achieves uniform temperature distribution across the radiator array, enhancing beam performance by reducing phase non-uniformity and increasing the horizontal viewing angle, while preventing overheating and damage, thus improving the LiDAR system's accuracy and reliability.
Implementation Method 1
Joule heating is used so as to adjust the temperature of the grating radiator array
Implementation Method 2
an optical phased array (OPA) radiator using a thermo-optical effect based on optical phased arrays
Data Source
AI summary
An optical phased array (OPA) radiator includes a plurality of unit radiators configured to serve as optical waveguides, each of the unit radiators being made of a silicon material and each having a predetermined length, where the unit radiators are disposed in parallel; a cladding portion configured to cover the plurality of unit radiators; and a plurality of electrodes arranged in parallel with the plurality of unit radiators on the cladding portion, where the plurality of electrodes are arranged so as not to overlap the plurality of unit radiators in a vertical direction. A beam radiated through the unit radiators using a phased array can be efficiently vertically steered.