We analyze the dynamics of a simple nonlinear optical circuit and draw upon analogies with neural network models. A key element in the circuit is a dynamic holographic medium, a photorefractive medium, which serves as a long-term memory. We discuss associative recall with the device in the context of competition among the memory states of the system. When the system is not being addressed, it will forget in time the stored items. At the same time, the system can display an unlearning phenomenon whereby long-term memory traces tend to equalize their strengths. Under other conditions the system will become obsessive, forgetting all memory traces except for one.
CY - Berlin, Heidelberg DO - 10.1007/978-3-642-83740-1_42 N2 -We analyze the dynamics of a simple nonlinear optical circuit and draw upon analogies with neural network models. A key element in the circuit is a dynamic holographic medium, a photorefractive medium, which serves as a long-term memory. We discuss associative recall with the device in the context of competition among the memory states of the system. When the system is not being addressed, it will forget in time the stored items. At the same time, the system can display an unlearning phenomenon whereby long-term memory traces tend to equalize their strengths. Under other conditions the system will become obsessive, forgetting all memory traces except for one.
PB - Springer Berlin Heidelberg PP - Berlin, Heidelberg PY - 1989 SN - 978-3-642-83740-1 SP - 417 EP - 424 TI - Nonlinear Optical Neural Networks: Dynamic Ring Oscillators ER -