Unit Cell Device for Large 2D Photonic Arrays
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Solution Overview
Problem
Large-scale two-dimensional phased-array architectures face challenges in achieving dense packing of phase-control elements and efficient electrical interconnects, leading to limitations in shaping and steering optical beams due to increasing layout constraints and unsustainability of lateral routing as array size grows.
Innovation Solution
The integration of phase-shifting elements, phase shift drivers, optical routing elements, and radiators within unit cells, utilizing direct bond hybridization to attach digital read-in integrated circuits to photonic integrated circuits, enabling vertical electrical connections and dense packing, allowing for independent control of each unit cell to produce modified optical beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If lateral routing of circuitry is used to implement electrical interconnects of phase-control elements, then connection can be achieved for low-element-count arrays, but layout constraints prevent connection for large-scale arrays with tens of millions of elements
Solution Approach 1:
The patent transitions from two-dimensional lateral routing to three-dimensional vertical integration by stacking the PIC array with the EIC plane above it. This dimensional change allows electrical interconnects to route vertically through the stacked architecture, eliminating the layout constraints that plague lateral routing in large-scale arrays.
Solution Approach 2:
The system is divided into separate functional layers: the PIC layer containing the optical array elements and the EIC layer containing the control circuitry. This segmentation allows each layer to be optimized independently and connected through vertical interconnects, solving the routing problem for large element counts.
2Quantity of substance
If array element count is increased to achieve dense radiators for beam shaping and steering, then far field pattern control is improved, but electrical interconnect density becomes limiting
Solution Approach 1:
By moving electrical interconnects to the vertical dimension through stacked architecture, the patent enables high-density electrical connections without increasing lateral complexity. This allows tens of millions of elements to be connected through vertical routing rather than lateral traces.
Solution Approach 2:
The patent merges the optical PIC layer with the electrical EIC layer into a single integrated unit cell structure. This combination allows simultaneous high-density optical elements and electrical interconnects without the routing conflicts that arise when they are separated in the lateral plane.
3Quantity of substance
If unit cells are tightly integrated with vertical integration of connections, then array density is increased, but manufacturing and assembly complexity increases
Solution Approach 1:
Both the PIC array and EIC are fabricated separately as complete functional units before being combined through stacking. This preliminary preparation of separate layers simplifies manufacturing by allowing each to be optimized and tested independently before integration.
Solution Approach 2:
The stacked architecture enables tight integration in the vertical dimension while maintaining manufacturing simplicity through separate layer fabrication. The vertical stacking approach is more manufacturable than attempting to integrate all functions in a single lateral plane.
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 enables the creation of large two-dimensional photonic phased arrays with hemispherical beam steering, offering increased performance and density, facilitating constructive interference for beam shaping and steering, and supporting applications like Free Space Optical Communication.
Implementation Method 1
Each unit cell may include a phase-shifting element, a phase shift driver, optical routing elements, and radiators (e.g., antennas) integrated within the unit cell. The phase shift driver may be in electrical communication with the phase-shifting element and the phase shift driver may be configured to independently control the phase-shifting element to produce a modified optical beam.
Implementation Method 2
Each unit cell may include a phase-shifting element, a phase shift driver, optical routing elements, and radiators (e.g., antennas) integrated within the unit cell.
Data Source
AI summary
A scalable independent unit cell device architecture may include a phase-shifting element and a phase shift driver both integrated within the unit cell device. The phase shift driver may be coupled to the phase-shifting element and the phase shift driver may independently control the phase-shifting element to produce an optical beam having a desired phase. The unit cell device may further include an optical antenna that outputs the beam having the desired phase. The unit cell device may be formed as an opto-electronic hybrid optimized to leverage direct bond hybridization (DBH) to attach an electronic integrated circuit wafer to a side of a photonic integrated circuit wafer. The resulting unit cell device (i.e., 24 microns) may tightly integrate individual element-level phase control, which may be implemented within large-scale two-dimensional photonic arrays with hemispherical beam steering.