Photonic Waveguide Coupling via Adiabatic Stacking and Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing photonic systems face challenges in achieving efficient optical coupling between multiple optical signal sources and photonic processing circuits, particularly in terms of optical losses and alignment tolerance.
Innovation Solution
The implementation of an adiabatic coupling mechanism between waveguides in photonic circuits, where positioning devices with complementary shapes facilitate precise alignment and mechanical contact, allowing for simultaneous optical signal transmission with reduced congestion and losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple optical signal sources operate in parallel on a same photonic emitter circuit, then the signal transmission capacity is improved, but the optical losses and congestion increase
Solution Approach 1:
The patent divides the optical coupling interface into multiple independent waveguide pairs, each handling a separate optical signal. The emitter circuit is segmented into multiple emission zones, each coupled to a corresponding processing circuit waveguide through dedicated adiabatic coupling structures, thereby reducing signal interference and congestion while maintaining high transmission capacity
Solution Approach 2:
The patent implements vertical stacking of waveguides at the coupling interface, with second waveguides positioned above first waveguides in the vertical dimension. This three-dimensional arrangement allows multiple optical signals to be transmitted in parallel through different vertical layers, increasing signal capacity while minimizing horizontal congestion and optical losses
2Productivity
If multiple optical signal sources operate in parallel on a same photonic emitter circuit, then the signal transmission capacity is improved, but the alignment precision requirements worsen
Solution Approach 1:
The patent incorporates positioning devices with complementary geometric shapes on both the emitter and processing circuits that automatically self-align during assembly. The protrusion on one circuit fits into the corresponding recess on the other circuit, providing mechanical guidance that ensures precise alignment of the waveguide interfaces without requiring complex external alignment equipment or procedures
Solution Approach 2:
The positioning devices are pre-integrated into the circuit structures during manufacturing, with protrusions and recesses precisely formed in advance. This preliminary preparation of alignment features ensures that when the circuits are assembled, the waveguides are automatically positioned with the required precision, eliminating the need for post-assembly alignment adjustments
3Loss of energy
If adiabatic coupling is realized between wave guides, then the optical losses are reduced, but the device complexity increases
Solution Approach 1:
The patent combines multiple waveguides in close proximity at the coupling interface, with second waveguides positioned directly above first waveguides. This merged configuration allows adiabatic coupling to occur simultaneously across multiple waveguide pairs in a compact structure, reducing optical losses through efficient mode matching while minimizing the overall device footprint and complexity
Solution Approach 2:
The patent transitions from planar waveguide coupling to three-dimensional vertical coupling, with waveguides arranged in stacked layers. This vertical arrangement enables adiabatic coupling to occur in the vertical dimension, allowing multiple coupling interfaces to be packed into a smaller horizontal area, thereby reducing device complexity while maintaining low optical losses through efficient adiabatic mode transformation
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 solution enables efficient and low-loss optical coupling between multiple optical signal sources and photonic processing circuits, achieving automatic alignment and reduced congestion, thereby improving the performance of photonic systems.
Implementation Method 1
an adiabatic coupling being realized between each second wave guide and the first wave guide covered by said second wave guide
Data Source
AI summary
A photonic system includes a first photonic circuit having a first face and a second photonic circuit having a second face. The first photonic circuit comprises first wave guides, and, for each first wave guide, a second wave guide covering the first wave guide, the second wave guides being in contact with the first face and placed between the first face and the second face, the first wave guides being located on the side of the first face opposite the second wave guides. The second photonic circuit comprises, for each second wave guide, a third wave guide covering the second wave guide. The first photonic circuit comprises first positioning devices projecting from the first face and the second photonic circuit comprises second positioning devices projecting from the second face, at least one of the first positioning devices abutting one of the second positioning devices in a first direction.