Optical Shuffle Network Lenslet Arrays for Low-Latency Interconnects
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Solution Overview
Problem
Computational systems face limitations due to long wires that cause signal delay and high power consumption, and existing optical interconnects fail to achieve high density and scalable interconnects with minimal delay and low power consumption.
Innovation Solution
An optical network with densely spaced transmitters and receivers, utilizing lenslet arrays for collimating and focusing beams to enable efficient signal routing between collected and dispersed arrays of tiles, allowing for high-density, low-power, and scalable interconnects through free-space optical trains and optoelectronic transducers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If long wires are used to interconnect processing elements, then the system can accommodate larger computational systems, but the signal delay and power consumption increase
Solution Approach 1:
The patent replaces electrical wire-based interconnects with optical interconnects using light propagation. This substitution eliminates the quadratic delay growth characteristic of electrical wires by using optical signals that can traverse longer distances with minimal delay, directly addressing the signal delay problem while maintaining system scalability
Solution Approach 2:
The patent introduces a third dimension (vertical stacking with lenslet arrays) to achieve long-range connections without requiring long horizontal wires. By stacking processing elements vertically and using optical lenses to establish long-range connections between layers, the system achieves scalable interconnectivity without the delay penalties of long planar wires
2Area of stationary object
If long wires are used to interconnect processing elements, then the system can accommodate larger computational systems, but the power consumption increases
Solution Approach 1:
The patent replaces electrical signal transmission through long wires with optical signal transmission. This substitution dramatically reduces power consumption because optical signals experience minimal attenuation over distance and do not require the continuous buffering and signal regeneration that electrical wires require, directly addressing the linear power growth problem
3Speed
If optical waveguides are used for interconnections, then high speed optical interconnects are achieved, but the number of channels cannot scale with chip area
Solution Approach 1:
The patent moves from planar waveguide interconnects to three-dimensional free-space optical interconnects using stacked lenslet arrays. This dimensional transition allows channels to scale with chip area by adding vertical layers, with each layer providing additional interconnect channels while maintaining high optical speeds
Solution Approach 2:
The patent divides the optical interconnect system into discrete lenslet array layers, with each layer providing a set of independent optical channels. This segmentation allows the system to scale by adding more layers, with each layer contributing additional channels proportional to the chip area
4Adaptability or versatility
If space-variant interconnection patterns are implemented, then routing flexibility is improved, but the interconnect density decreases
Solution Approach 1:
The patent implements dynamically reconfigurable optical interconnects using programmable optical elements in the lenslet arrays. This allows the system to adapt connection patterns in real-time based on computational requirements while maintaining high density, resolving the trade-off between routing flexibility and interconnect density
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 solution enables effective routing of signals with minimal delay and low power consumption, maintaining high density interconnects while scaling with complex computational systems, suitable for applications like artificial neural networks and systolic arrays.
Implementation Method 1
An originating lenslet array having two parallel layers of lenslets is parallel and adjacent the array of originating tiles. Each lenslet pair within the lenslet array pair corresponds to a tile. The lenslet array pair collimates beams from transmitters such that the location of a transmitter within its tile determines the direction of its resulting collimated beam.
Implementation Method 2
Similarly, a terminating lenslet array focuses collimated beams to receivers such that the direction of a collimated beam determines which receiver it is focused on.
Data Source
AI summary
Optical communication system communicates between an array of originating tiles and an array of terminating tiles. Each array is associated with a lenslet array, such as a two-layer array which has two layers of lenslets. Each originating tile has an array of transmitters and each terminating tile has an array of receivers. Each tile is associated with a common lenslet or lenslet pair. A beamlet from a representative transmitter passes through the lenslet pair adjacent to its tile to become a collimated beam whose angle is related to the location of the transmitter. The collimated beam passes through the receiver lenslet pair adjacent to the tile containing the receiver associated with the representative transmitter, and is focused onto that receiver by that lenslet pair. The system may operate in the reverse direction, wherein the transmitters are transmitter-receivers, the receivers are receiver-transmitters, and a beam from a receiver-transmitter is directed to its corresponding transmitter-receiver.