Optical implementation of the Hopfield neural network using multiple fiber nets
Fumihiko Ito, Ken‐ichi Kitayama · Applied Optics · 1989
Associative memory based on the Hopfield model utilizing interconnections by multiple optical fiber nets is proposed and demonstrated experimentally. The coupling ratio from fiber to fiber represents the synaptic weight of the connection between units. The remarkable feature of the optical fiber neural networks is that global connections between 2-D units can be easily achieved, resulting in simultaneous multiplication of the weight matrix and input vector. In the experiment, multiple fiber nets having 25(2) connections for 5 x 5 binary patterns are prepared, and three patterns are stored and successfully retrieved.