公开(公告)号：US20200379504A1

公开(公告)日：2020-12-03

申请号：US16986383

申请日：2020-08-06

Applicant: Massachusetts Institute of Technology

Inventor： Jacques Johannes CAROLAN ,  Mihika PRABHU ,  Scott A. SKIRLO ,  Yichen Shen ,  Marin SOLJACIC ,  DIRK ENGLUND ,  Nicholas Christopher HARRIS

IPC: G06E3/00 ,  G06N3/04 ,  G06N3/08 ,  G02F1/225 ,  G02F1/35 ,  G02F1/365 ,  G02F3/02 ,  G06N3/067

Abstract: An optical neural network is constructed based on photonic integrated circuits to perform neuromorphic computing. In the optical neural network, matrix multiplication is implemented using one or more optical interference units, which can apply an arbitrary weighting matrix multiplication to an array of input optical signals. Nonlinear activation is realized by an optical nonlinearity unit, which can be based on nonlinear optical effects, such as saturable absorption. These calculations are implemented optically, thereby resulting in high calculation speeds and low power consumption in the optical neural network.

公开(公告)号：US10768659B2

公开(公告)日：2020-09-08

申请号：US16273257

申请日：2019-02-12

Applicant: Massachusetts Institute of Technology

Inventor： Jacques Johannes Carolan ,  Mihika Prabhu ,  Scott A. Skirlo ,  Yichen Shen ,  Marin Soljacic ,  Nicholas Christopher Harris ,  Dirk Englund

IPC: G06E3/00 ,  G06N3/04 ,  G06N3/08 ,  G02F1/225 ,  G02F1/35 ,  G02F1/365 ,  G02F3/02 ,  G06N3/067 ,  G02F1/21

Abstract: An optical neural network is constructed based on photonic integrated circuits to perform neuromorphic computing. In the optical neural network, matrix multiplication is implemented using one or more optical interference units, which can apply an arbitrary weighting matrix multiplication to an array of input optical signals. Nonlinear activation is realized by an optical nonlinearity unit, which can be based on nonlinear optical effects, such as saturable absorption. These calculations are implemented optically, thereby resulting in high calculation speeds and low power consumption in the optical neural network.

公开(公告)号：US20200025468A1

公开(公告)日：2020-01-23

申请号：US16460683

申请日：2019-07-02

Applicant: MASSACHUSETTS INSTITUTE OF TECHNOLOGY

Inventor： Marin Soljacic ,  Evelyn Wang ,  Yichen Shen ,  Bikramjit Bhatia ,  Arny Leroy

IPC: F28F9/20 ,  F28F13/18 ,  F24F5/00

Abstract: A radiative cooling device can include a reflector positionable to permit operation during daylight hours.

公开(公告)号：US20180260703A1

公开(公告)日：2018-09-13

申请号：US15820906

申请日：2017-11-22

Applicant: Massachusetts Institute of Technology

Inventor： Marin Soljacic ,  Yichen Shen ,  Li Jing ,  Tena Dubcek ,  Scott Skirlo ,  John E. Peurifoy ,  Max Erik Tegmark

IPC: G06N3/08 ,  G06N3/04 ,  G06F17/14 ,  G06F17/16

CPC classification number: G06N3/08 ,  G06F17/142 ,  G06F17/16 ,  G06N3/0445 ,  G06N3/084 ,  G06N20/00

Abstract: A system for training a neural network model, the neural network model comprising a plurality of layers including a first hidden layer associated with a first set of weights, the system comprising at least one computer hardware processor programmed to perform: obtaining training data; selecting a unitary rotational representation for representing a matrix of the first set weights, the selected unitary rotational representation comprising a plurality of parameters; training the neural network model using the training data using an iterative neural network training algorithm to obtain a trained neural network model, each iteration of the iterative neural network training algorithm comprising: updating values of the plurality of parameters in the selected unitary rotational representation for representing the matrix of the set of weights for the at least one hidden layer, and saving the trained neural network model.

公开(公告)号：US10073191B2

公开(公告)日：2018-09-11

申请号：US14630080

申请日：2015-02-24

Applicant: Massachusetts Institute of Technology

Inventor： Yichen Shen ,  Dexin Ye ,  Ivan Celanovic ,  Steven G. Johnson ,  John D. Joannopoulos ,  Marin Soljacic

IPC: G02B1/00 ,  G02B5/30 ,  G02B5/26 ,  G02F1/01 ,  G02B5/20

CPC classification number: G02B1/005 ,  G02B5/20 ,  G02B5/26 ,  G02B5/3066 ,  G02B5/3083 ,  G02F1/0131 ,  G02F1/0147

Abstract: A filter to transmit incident radiation at a predetermined incidence angle includes a plurality of photonic crystal structures disposed substantially along a surface normal direction of the filter. The photonic crystal structure includes a multilayer cell that comprises a first layer having a first dielectric permittivity, and a second layer having a second dielectric permittivity different from the first dielectric permittivity. The first layer and the second layer define a Brewster angle substantially equal to the predetermined incidence angle based on the first dielectric permittivity and the second permittivity. Each photonic crystal structure in the plurality of photonic crystal structures defines a respective bandgap, and the respective bandgaps of the plurality of photonic crystal structures, taken together, cover a continuous spectral region of about 50 nm to about 100 mm.