TR announcement

[Eric Hartman]

The following technical report is now available.
Requests may be sent to eric at mcc.com
or via physical mail to the MCC address below.
---------------------------------------------------------------

                  MCC Technical Report Number:
                       ACT-ST-146-89 

  Optoelectronic Implementation of Multi-Layer Neural Networks    
             in a Single Photorefractive Crystal

             Carsten Peterson*, Stephen Redfield, 
              James D. Keeler, and Eric Hartman

       Microelectronics and Computer Technology Corporation
                 3500 W. Balcones Center Dr.
                    Austin, TX 78759-6509

                          Abstract:

We present a novel, versatile optoelectronic neural network
architecture for implementing supervised learning algorithms 
in photorefractive materials.  The system is based on spatial 
multiplexing rather than the more commonly used angular 
multiplexing of the interconnect gratings.  This simple, 
single-crystal architecture implements a variety of multi-layer 
supervised learning algorithms including mean-field-theory, 
back-propagation, and Marr-Albus-Kanerva style algorithms.  
Extensive simulations show how beam depletion, rescattering, 
absorption, and decay effects of the crystal are compensated 
for by suitably modified supervised learning algorithms.

*Present Address: Department of Theoretical Physics,
 University of Lund, Solvegatan 14A, S-22362 Lund, Sweden.