Photonic Mesh Couplers for Fast Optical Matrix Computation
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Solution Overview
Problem
Existing photonic processors face limitations in performing parallelized computation tasks such as matrix-vector multiplications at optical data rates due to slow signal modulation speeds of phase-change materials, leading to increased computation time.
Innovation Solution
A photonic processor with a network of fully connected light guiding units and controllable optical couplers, each equipped with electrically or optically tunable modulation structures, allowing for fast intensity modulation of light signals through independent control of optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If phase-change materials are used for signal modulation in photonic processors, then the photonic processor can perform parallelized computation tasks, but the computation speed is reduced due to slow signal modulation
Solution Approach 1:
The patent changes the modulation mechanism from phase-change materials to electro-absorption effects in semiconductor waveguides. By applying electric fields to alter the absorption coefficient of the waveguide material, the system achieves fast intensity modulation without relying on slow phase transitions, thus resolving the contradiction between computational throughput and modulation speed
Solution Approach 2:
The patent replaces the thermal-phase change mechanism with an electro-optic modulation mechanism. Instead of using heat-induced phase transitions in PCM materials, the system uses electric field-induced absorption changes in semiconductor materials, enabling much faster modulation speeds while maintaining parallelized computation capability
2Speed
If controllable optical couplers with tunable modulation structures are integrated into light guiding units, then the computational speed is enhanced, but the device complexity increases
Solution Approach 1:
The patent merges the optical coupler functionality with the modulation structure by integrating the electro-absorption modulator directly into the waveguide path. This consolidation allows the coupler to provide both signal routing and intensity modulation functions through a single integrated component, reducing overall device complexity while maintaining high computation speed
Solution Approach 2:
The electro-absorption modulator integrated in the waveguide serves multiple functions: it acts as both an optical coupler for signal routing and as an intensity modulator for computational operations. This multi-functionality reduces the need for separate components, thereby reducing device complexity while enhancing computation speed
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
Enables high computational throughput and low latency by facilitating rapid switching between different active states of the couplers, thereby enhancing computation speed and efficiency.
Implementation Method 1
The controllable optical coupler includes a light guiding element for optically coupling a portion of light from one light guiding unit to the other intersecting light guiding unit, and is configured as a tunable modulation structure, being either electrically or optically tunable
Implementation Method 2
photonic chips can perform the dot product inherently using light-matter interactions such as via a phase shifter
Implementation Method 3
a network (e.g. mesh) of fully connected light guiding units (e.g., waveguides or optical fibers)
Implementation Method 4
enable signal accumulation (summation) by either electromagnetic coherent interference or incoherent accumulation through detectors
Data Source
AI summary
A photonic system includes a photonic mesh comprising a first array of N input light guiding units located in a first plane and arranged in a spaced-apart substantially parallel relationship along a first axis, and a second array of M output light guiding units located in a second plane and arranged in a spaced-apart substantially parallel relationship along a second axis intersecting with the first axis. The optical coupler is configured for coupling a portion of an input light signal from the input light guiding unit into the output light guiding unit at the respective node, and is configured as a tunable modulation structure controllably switchable between various operative states by a tuning field, configured as a weighting signal to effect a corresponding intensity modulation of the portion of the light signal being coupled from the input light guiding unit into the output light guiding unit by said optical coupler.