3D Integrated Optical Phase Array for High-Power Beamsteering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Silicon photonics face limitations in high-power, large-scale optical phase array (OPA) implementations due to low optical power handling, complex waveguide routing constraints, and inefficient emission efficiency, particularly in two-dimensional arrays, which hinder beamsteering performance and increase power consumption.
Innovation Solution
A three-dimensional integrated optical phase array design featuring a silicon nitride interposer with photonic waveguide layers and OPA chiplets that allow for complex waveguide routing, improved optical power distribution, and enhanced emission efficiency through vertical coupling and reflector placement, enabling higher output power and finer beamsteering control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If silicon waveguides are used for high-power optical transmission, then optical power handling capability is improved, but two-photon absorption loss increases
Solution Approach 1:
The patent changes the material parameter from silicon to silicon nitride, which has different optical properties. Silicon nitride exhibits lower two-photon absorption coefficients, enabling high optical power transmission with reduced loss while maintaining waveguide functionality.
Solution Approach 2:
The patent employs a composite structure combining silicon nitride waveguides with metal reflectors. This composite approach leverages the low absorption properties of silicon nitride and the high reflectivity of metals to achieve superior optical power handling and reduced energy loss.
2Ease of manufacture
If a single device layer is used on SOI chip, then fabrication complexity is reduced, but waveguide routing flexibility and emitter connection capability are limited
Solution Approach 1:
The patent transitions from planar 2-D waveguide routing to 3-D vertical routing by stacking multiple photonic layers. This dimensional change enables complex waveguide connections and emitter architectures while maintaining fabrication feasibility through standard multi-layer processing.
Solution Approach 2:
The patent divides the photonic structure into multiple functional layers (silicon nitride waveguide layer, metal reflector layer, emitter layer) that can be independently fabricated and then integrated. This segmentation allows optimized routing in each layer while simplifying individual fabrication steps.
3Ease of manufacture
If grating emitters are used on SOI layer, then integration with silicon photonics is achieved, but emission efficiency is reduced due to light propagation in both directions
Solution Approach 1:
The patent extracts the reflector function from the SOI substrate by introducing a dedicated metal reflector layer beneath the grating emitters. This separation allows the emitters to couple more efficiently with the waveguides while the metal layer captures and redirects downward-propagating light, significantly improving emission efficiency.
4Loss of energy
If emitter footprint is increased for reasonable emission efficiency, then emission efficiency is improved, but emitter pitch increases reducing fill factor
Solution Approach 1:
The patent improves emission efficiency by utilizing vertical dimension optimization through multi-layer stacking and 3-D waveguide routing, rather than increasing the horizontal emitter footprint. This allows maintaining small emitter pitch and high fill factor while achieving efficient light coupling through optimized vertical mode matching.
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
The solution increases optical power handling, reduces power consumption, and improves beamsteering performance by enabling more efficient waveguide routing and emission efficiency, addressing the limitations of silicon photonics in large-scale OPAs.
Implementation Method 1
photonic waveguide layers on top of a silicon substrate
Implementation Method 2
placing a reflector on the OPA chiplet to reflect light that propagates down into the substrate back upward
Implementation Method 3
vertical coupling and reflector placement, enabling higher output power
Data Source
AI summary
Methods of manufacturing and operating a monolithically integrated optical phase array (OPA) chip device, and the device itself. A three-dimensional (3-D) integrated optical phase array (OPA) chip device. A system of complementary metal-oxide-semiconductor (CMOS) electronics integrated with a three-dimensional integrated optical array chip device. A method of three-dimension photonic integration to improve optical power in optical phase arrays.