Optical Waveguide Multiplication Using Phase Change Modulation
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Solution Overview
Problem
Current computing systems face limitations in speed due to the separation of data storage and processing, with photonic devices showing potential but requiring improvements in areas like multiplication and memory operations.
Innovation Solution
A method and apparatus using an optical waveguide with a modulating element, such as a phase change material, to perform multiplication operations by encoding values onto optical or electrical signals, adjusting the state of the modulating element to encode and decode signal intensities, enabling efficient multiplication and digital-to-analogue conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If data storage and processing are performed in separate physical locations, then memory capacity is improved, but computing speed deteriorates due to transfer limitations
Solution Approach 1:
The patent merges memory and processing functions into a single photonic device by integrating modulating elements (for storage) with optical waveguides and interferometric structures (for processing). This allows data to be stored and computed upon in the same physical location, eliminating transfer bottlenecks while maintaining memory capacity through the modulating elements' ability to hold multiple states.
2Speed
If photonic devices are used for multiplication operations, then computing speed is improved, but device complexity increases
Solution Approach 1:
The photonic device achieves multi-functionality by enabling multiple operations (multiplication, digital-to-analogue conversion, memory storage) within a single integrated structure. The modulating elements can be programmed to perform different functions, and the optical interferometric structure serves both computation and storage purposes, reducing overall system complexity despite the advanced photonic capabilities.
3Measurement precision
If modulating element thickness is reduced to enhance optical modulation, then multiplication precision is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent addresses manufacturing precision challenges by optimizing the thickness parameter of modulating elements to specific ranges (20-40 nm) where optical modulation effects are maximized while remaining manufacturable. The design also incorporates compensation mechanisms through the optical interferometric structure that can tolerate minor thickness variations, allowing high multiplication precision to be achieved without requiring extremely tight manufacturing tolerances.
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 allows for rapid and efficient multiplication operations and digital-to-analogue conversion, potentially bridging the gap between storage and processing, enhancing computing speed and efficiency.
Implementation Method 1
a modulating element that is optically coupled to the optical waveguide, the modulating element modifying a transmission, reflection or absorption characteristic of the waveguide dependant on its state
Implementation Method 2
The modulating element may comprise a phase change material. The phase change material may be a superlattice material.
Implementation Method 3
an optical waveguide, and a modulating element that is optically coupled to the optical waveguide
Data Source
AI summary
A method of performing a multiplication operation in the optical domain using a device (100) comprising: an optical waveguide (101), and a modulating element (102) that is optically coupled to the optical waveguide (101), the modulating element (102) modifying a transmission, reflection or absorption characteristic of the waveguide (101) dependant on its state, wherein the state of the modulating element (102) is adjustable by a write signal (103). The method comprises: encoding a first value to the write signal (103), using the write signal (103) to map the first value to a state of the modulating element (102); encoding a second value to a read signal (104); producing an output signal intensity as the transmitted or reflected read signal, wherein the product of the first value and the second value is encoded in the output signal intensity.