Abstract

A two-dimensional amorphous silicon photoconductor array and a liquid-crystal display form the core components of a hardware system for the implementation of a multilayer perceptron neural network. All connections between layers, as well as the nonlinear transfer characteristics associated with the hidden-and output-layer neurons, are implemented in analog circuitry so that the network, once trained, behaves as a stand-alone processor. Subject to a standard backpropagation training algorithm, the network is shown to train very successfully. Training of the network is studied under different levels of weight quantization, neuron output resolution, and random weight-defect probability. A computer simulation of the hardware network is also performed, and excellent agreement is shown between the results of the hardware network and those of the computer simulation. It is concluded that the training capability of the present hardware network is very little degraded by its nonidealities, including the level of weight quantization and limit in neuron output resolution.

© 1993 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Trainable optically programmed neural network

Richard G. Stearns
Appl. Opt. 31(29) 6230-6239 (1992)

Neural network that incorporates direct optical imaging

Richard G. Stearns
Appl. Opt. 34(14) 2595-2604 (1995)

High-capacity neural networks on nonideal hardware

Leonard Neiberg and David Casasent
Appl. Opt. 33(32) 7665-7675 (1994)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (11)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (5)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription