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Browse Prior Art Database

Optical Coupling of Neighboring Neurons in Neural Networks

IP.com Disclosure Number: IPCOM000121819D
Original Publication Date: 1991-Sep-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 1 page(s) / 61K

Publishing Venue

IBM

Related People

Petrillo, RA: AUTHOR

Abstract

Described is a method of reducing wiring complexity in neural networks. This is accomplished by replacing the inhibit signals from active neurons to their neighbors with an optical coupling.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 61% of the total text.

Optical Coupling of Neighboring Neurons in Neural Networks

      Described is a method of reducing wiring complexity in neural
networks.  This is accomplished by replacing the inhibit signals from
active neurons to their neighbors with an optical coupling.

      The wiring paths between a neuron and its neighbors can be
replaced by an optical coupling system composed of four parts (see
the figure):  1) a light-emitting device (A), 2) a transmission
medium (B), 3) a convex reflective surface (C), and 4) a
photo-sensitive device (D).

      Each neuron has imbedded within its structure a lightemitting
device and a photo-sensitive device.  The light- emitting device will
become active (emit light) whenever the neuron becomes active.  The
photo-sensitive device will inhibit the neuron from becoming active
whenever light is detected.  However, an active neuron may never
become inactive due to the detection of light by the photo-sensitive
device, only by a change in its input values or weight.

      The neural network chip is covered with an even layer of
material which will efficiently transmit light B.  Over each neuron's
light-emitting device is etched a spherical depression into this
material.  These depressions will define the surface of the convex
reflective surfaces C.  A thin layer of reflective material is
deposited on the surface of the transmission medium, filling the
spherical depressions.  This forms the convex reflective surface C.

    ...