Edge-Coupled Optical Phased Arrays for Dense Emitter Integration
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Solution Overview
Problem
Implementing high-performance two-dimensional optical phased arrays is challenging due to the difficulty in close packing of light emitters, phase shifting elements, and output couplers on the emitting chip, which limits beam steering range and emitter density.
Innovation Solution
The solution involves a multi-integrated circuit structure where optical waveguides and emitter elements are arranged on one circuit, with phase shifters on separate circuits coupled edge-wise to the waveguides, allowing for compact and dense packing of emitters and phase shifters, and enabling efficient optical and electrical signal distribution among multiple chips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If phase shifting elements, light delivery system, and output couplers share space on the emitting chip, then device integration is achieved, but emitter density and beam steering range are limited
Solution Approach 1:
The system is divided into separate functional modules: phase shifters are placed on one integrated circuit while emitters are placed on another integrated circuit. This segmentation allows each module to be optimized independently and eliminates the space constraints of monolithic integration, thereby increasing emitter density while maintaining full functionality.
Solution Approach 2:
The patent transitions from planar integration (all components on one chip) to three-dimensional stacking (multiple chips stacked vertically). By moving phase shifters to a separate layer on a different integrated circuit, the system achieves higher emitter density without compromising beam steering capability, effectively utilizing the vertical dimension to resolve the spatial conflict.
2Quantity of substance
If emitters are closely packed to increase density, then emitter density increases, but beam steering range and performance deteriorate
Solution Approach 1:
By separating phase shifters and emitters onto different integrated circuits, the system achieves close emitter packing without the phase shifters interfering with emitter spacing. This segmentation enables high emitter density while preserving the full beam steering range through independent optimization of each module.
3Device complexity
If multiple components share the same chip space, then device integration is achieved, but manufacturing and alignment complexity increase
Solution Approach 1:
Dividing the system into separate integrated circuits for phase shifters and emitters simplifies manufacturing by allowing each module to be fabricated and tested independently before final assembly. This segmentation reduces alignment complexity compared to monolithic integration, as each chip can be optimized separately and then precisely coupled through standardized interfaces.
Solution Approach 2:
The patent introduces optical waveguides as intermediary elements that couple the separate phase shifter and emitter modules. These waveguides serve as precise alignment features that facilitate accurate coupling between chips, reducing manufacturing complexity while maintaining high precision alignment necessary for optimal performance.
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 enables a denser arrangement of emitters and phase shifters, increasing the beam steering range and reducing side lobes, thereby enhancing the performance of two-dimensional optical phased arrays by allowing for more efficient light emission and beam control.
Implementation Method 1
each optical emitter element coupled to a distal end of one of the optical waveguide segments
Implementation Method 2
a plurality of optical phase shifters that each provide a phase-shifted optical wave
Data Source
AI summary
An apparatus comprises: a first integrated circuit comprising: a plurality of sets of optical waveguides, each set of optical waveguides including a plurality of optical waveguide segments, and a plurality of optical emitter elements arranged over a first surface of the first integrated circuit, each optical emitter element coupled to a distal end of one of the optical waveguide segments; and a second integrated circuit comprising: a plurality of optical phase shifters that each provide a phase-shifted optical wave that is coupled to the first integrated circuit from a first edge surface of the second integrated circuit. The first edge surface of the second integrated circuit is in proximity to a row of proximal ends of the optical waveguide segments of a first set of the plurality of sets of optical waveguides.