Optical Integrated Circuit Co-Design with Cascaded Passive-Active Layers
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Solution Overview
Problem
Existing optical integrated circuits face challenges in achieving low power consumption, low noise, and a small footprint while being scalable for higher port counts, due to high cross talk, insertion loss, and limited degrees of freedom in reconfigurable elements.
Innovation Solution
A cascaded series of active and passive layers is designed using co-design optimization, where passive layers are inverse designed diffractive blocks and active layers include reconfigurable optical phase shifters, with joint optimization determining the layout and phase shifts to achieve scalable optical switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional optical integrated circuits are designed with more reconfigurable elements to achieve higher port counts and complex routing, then adaptability and functionality improve, but power consumption and noise increase
Solution Approach 1:
The optical integrated circuit is divided into multiple layers (first optical layer, second optical layer, third optical layer) with different types of optical elements. Each layer handles specific routing functions, allowing the system to achieve complex routing capabilities while minimizing the number of active elements required in each layer, thus reducing overall power consumption.
Solution Approach 2:
Different regions of the optical integrated circuit are designed with different properties: the first optical layer uses first optical elements with specific characteristics, the second optical layer uses second optical elements with different characteristics, and the third optical layer uses third optical elements. This local differentiation allows optimized performance for specific routing tasks while reducing overall energy consumption.
2Adaptability or versatility
If conventional optical integrated circuits increase the number of reconfigurable elements to achieve higher port counts, then adaptability improves, but the footprint and device complexity increase
Solution Approach 1:
The circuit is segmented into three distinct optical layers, each with specific optical elements designed for particular functions. This segmentation allows the system to achieve high port counts through layered routing rather than requiring all elements to coexist in a single layer, thereby reducing the overall footprint.
Solution Approach 2:
The patent transitions from a single-layer planar arrangement to a multi-layer three-dimensional structure. By utilizing vertical stacking of optical layers, the system achieves higher port counts and complex routing capabilities without proportionally increasing the horizontal footprint, effectively adding functionality in the vertical dimension.
3Adaptability or versatility
If conventional optical integrated circuits use more active elements to achieve complex routing, then adaptability improves, but cross talk and insertion loss increase
Solution Approach 1:
By dividing the routing function across three separate optical layers with different optical elements, the patent reduces the number of active elements that need to operate simultaneously in any single layer. This segmentation isolates signal paths and reduces interference, thereby minimizing cross talk while maintaining complex routing capability.
Solution Approach 2:
The multi-layer structure acts as an intermediary mechanism that mediates between input and output ports. Each layer serves as an intermediate stage in the routing process, allowing signals to be progressively directed through different optical elements, which reduces direct interference and cross talk compared to single-layer approaches.
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 proposed solution enables efficient optical switching with reduced power consumption, lower cross talk, and a smaller footprint, allowing for higher port counts and complex routing, while maintaining high computing rates.
Implementation Method 1
each passive layer is a respective inverse designed diffractive block formed of diffraction elements
Implementation Method 2
each active layer includes one or more reconfigurable optical phase shifters
Data Source
AI summary
An optical integrated circuit is described that is constructed from a plurality of passive layers and active layers, arranged in a cascaded order, alternating between passive layer and active layer. Each passive layer relates its inputs to its outputs through a respective transmission matrix that may be implemented as an inverse designed diffractive block, such as metasurface. Each active layer includes one or more reconfigurable optical phase shifters. The layouts of each of the plurality of passive layers and the plurality of active layers are jointly determined using co-design having an optimization function incorporating parameters for the passive layers and the active layers.