Hybrid Optical Steering Arrays for Wide-Angle, Fine Beam Control
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Solution Overview
Problem
Existing optical beam steering technologies face challenges with limited angular resolution in switchable gratings and scaling issues in photonic integrated circuit-based optical phased arrays, particularly in achieving wide beam steering coverage.
Innovation Solution
Hybrid optical beam steering architectures combining liquid crystal polarization gratings and photonic integrated circuit antennas, utilizing multiple stages of liquid crystal polarization gratings for wide-angle tuning and PIC antennas for fine steering, with integrated components like waveguide amplifiers, phase shifters, and cooling layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If switchable gratings are used for wide-angle tuning, then beam steering coverage is improved, but angular resolution deteriorates
Solution Approach 1:
The system divides the beam steering function into two segments: liquid crystal polarization gratings handle wide-angle tuning (coarse steering), while photonic integrated circuit antennas handle fine angular positioning (fine steering). This segmentation allows each component to optimize for its specific function, resolving the contradiction between wide coverage and high resolution.
Solution Approach 2:
The patent combines liquid crystal polarization grating technology with photonic integrated circuit antenna arrays into a hybrid system. The LC grating provides wide-angle beam steering capability while the PIC antenna array provides high angular resolution, merging the advantages of both technologies to simultaneously achieve wide coverage and high precision.
2Adaptability or versatility
If small pitch optical emitters are used in OPAs, then wide beam steering coverage is achieved, but scaling issues arise
Solution Approach 1:
The liquid crystal polarization grating acts as an intermediary component that enables wide beam steering coverage without requiring small pitch optical emitters. The LC grating modulates the beam direction before it reaches the PIC antenna array, allowing the system to achieve wide coverage while maintaining larger, more manufacturable emitter pitches.
3Measurement precision
If photonic integrated circuit antennas are used for phase modulation, then beam shaping precision is improved, but device complexity increases
Solution Approach 1:
The system segments the beam control functions: liquid crystal polarization gratings handle coarse beam steering and direction control, while photonic integrated circuit antennas handle fine phase modulation and beam shaping. This segmentation reduces the complexity burden on any single component while maintaining overall high precision.
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
Provides compact, high-resolution optical beam steering with wide steering range, suitable for applications such as laser illumination, active sensing, and laser communications, while reducing space, weight, and power consumption.
Implementation Method 1
the beam director includes liquid crystal polarization gratings
Implementation Method 2
liquid crystal polarization gratings
Implementation Method 3
each tile includes an array of photonic integrated circuit (PIC) antennas
Data Source
AI summary
An apparatus includes an array of tiles, where (i) each tile is configured to transmit or receive optical signals and (ii) each tile includes an array of photonic integrated circuit (PIC) antennas. The apparatus also includes a beam director configured to direct the optical signals to or from each of the tiles, where the beam director includes liquid crystal polarization gratings.