Binary Tree Photonic Devices for Compact Multiplexing
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Solution Overview
Problem
Conventional photonic multiplexers and demultiplexers, such as arrayed waveguide gratings and optical multiplexing circuits, face challenges in achieving optimal performance specifications like channel integrity and power loss reduction while maintaining a compact form factor, often resulting in larger device sizes that limit integration density on silicon-based photonic integrated circuits.
Innovation Solution
The design of a photonic device with a binary tree configuration divided into multiple functional sub-regions, featuring an inhomogeneous distribution of materials in a dispersive region, which induces optical interactions and improves multiplexing/demultiplexing performance, reducing power loss and wavelength sensitivity, and achieving a significantly smaller footprint compared to traditional devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional arrayed waveguide grating structures are used to achieve adequate path length for phase-mismatch interference, then multiplexing performance is improved, but device size increases to several square centimeters
Solution Approach 1:
The patent implements a binary tree structure where waveguide branches are nested hierarchically, with each level containing smaller-scale versions of the same structure. This self-similar nested arrangement allows the device to achieve the required optical path length differences through compact, space-efficient folding of the waveguide paths, reducing the overall device footprint from square centimeters to square millimeters while maintaining the phase-mismatch interference performance
Solution Approach 2:
The patent transitions from conventional planar waveguide arrangements to a three-dimensional integrated structure using vertical stacking and lateral coupling. By utilizing multiple layers and vertical space, the device achieves adequate optical path length differences without requiring large lateral dimensions, effectively converting a two-dimensional layout problem into a three-dimensional solution that reduces the device footprint
2Area of stationary object
If silicon-on-insulator based waveguide devices are used to reduce overall dimensions, then device size is reduced, but fabrication complexity becomes prohibitive due to air-gapped waveguides
Solution Approach 1:
The patent extracts and eliminates the air-gap requirement from the waveguide structure by implementing continuous dielectric-embedded waveguides. This removes the complex fabrication steps needed to create and maintain air gaps, such as precise etching, deposition of gap materials, and alignment procedures, thereby significantly simplifying the manufacturing process while maintaining compact device dimensions
Solution Approach 2:
The patent changes the structural parameter of waveguide separation from air-gapped to dielectric-embedded configuration. This parameter change transforms the fabrication requirements from complex multi-step processes involving air gap creation to standard semiconductor fabrication techniques using conventional dielectric materials, making the device both compact and manufacturable
3Reliability
If conventional optical multiplexing circuits are used to achieve wavelength division multiplexing, then channel separation is achieved, but lateral dimension increases to tens of centimeters
Solution Approach 1:
The patent segments the optical signal path into multiple hierarchical levels of binary tree structures, where each level handles a subset of wavelength channels. This segmentation allows channel separation to be achieved through multiple smaller-scale interference events rather than a single large-scale structure, reducing the lateral dimension from tens of centimeters to millimeters while maintaining effective wavelength division multiplexing
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 results in a compact photonic device with improved wavelength sensitivity, power balance, and reduced power loss, enabling effective multiplexing/demultiplexing in a much smaller form factor, enhancing integration density on photonic integrated circuits.
Implementation Method 1
The dispersive region includes a first sub-region configured to induce optical interactions between the optical signal and a plurality of irregular interfaces between a first material and a second material
Implementation Method 2
induces optical interactions and improves multiplexing/demultiplexing performance, reducing power loss and wavelength sensitivity
Data Source
AI summary
Photonic devices, photonic integrated circuits, optical elements, and techniques of making and using the same are described. A photonic device includes an input region adapted to receive an optical signal including a multiplexed channel characterized by a distinct wavelength, a dispersive region optically coupled with the input region to receive the optical signal, the dispersive region including a plurality of sub-regions defined by an inhomogeneous arrangement of a first material and a second material, and a plurality of output regions optically coupled with the input region via the dispersive region. The plurality of sub-regions can include an input channel section, one or more coupler sections, and one or more branching sections. The plurality of sub-regions together can configure the photonic device to demultiplex the optical signal and to isolate the multiplexed channel at a first output region of the plurality of output regions.