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US 2025/0028949 A1Published application
Optical neural network with gain from parity time optical couplers
AssigneeUniversity of Southern California
InventorsMercedeh KHAJAVIKHAN, Haoqin DENG
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Abstract
An apparatus and methods are provided for an optical neural network architecture that utilizes parity-time (PT) symmetric couplers. The example PT symmetric optical neural network is based on layers using the PT symmetric couplers that each have two parallel waveguides. One waveguide applies gain while the other waveguide applies an equal loss to signals.
Claims23
A method for implementing a first layer of an optical neural network (ONN), the method comprising:
- encoding pixels of incoming data in light amplitude;
- sending optical signals corresponding to the encoded pixels to a first parity-time (PT) coupler;
- causing the optical signals passing through the first PT coupler to pass through an amplifier/attenuator;
- passing the signals through a second PT coupler;
- and
- passing optical signals to nonlinear elements (NE).
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An optical neural network (ONN) comprising:
- a light source configured to encode pixels of incoming data in light amplitude;
- a first layer including:
- a first parity-time (PT)-symmetric directional coupler configured to receive optical signals corresponding to the encoded pixels;
- an amplifier/attenuator configured to receive the optical signals passing through the first PT coupler;
- a second PT-symmetric directional coupler configured to receive the optical signals passing through the first PT coupler and the amplifier/attenuator;
- nonlinear elements configured to receive the optical signals passing through the first PT coupler, the amplifier/attenuator, and the second PT-symmetric directional coupler in the first layer of the ONN;
- a second layer including:
- photodetectors configured to receive the optical signals from the first layer of the ONN,
- a first parity-time (PT)-symmetric directional coupler configured to receive optical signals from the photodetectors;
- an amplifier/attenuator configured to receive the optical signals passing through the first PT coupler;
- a second PT-symmetric directional coupler configured to receive the optical signals passing through the first PT coupler and the amplifier/attenuator;
- nonlinear elements configured to receive the optical signals passing through the first PT coupler, the amplifier/attenuator, and the second PT-symmetric directional coupler in the second layer of the ONN;
- and
- an output layer of optical detectors.
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Dependencies are inferred from the claim text.