Accession Number : ADP008672

Title :   Nonlinear Thresholding Characteristics for Optical Computing of Optically Addressable GaAs/FLC-SLM,

Corporate Author : NIPPON TELEGRAPH AND TELEPHONE CORP TAKE TRANSMISSION SYSTEMS LABS

Personal Author(s) : Hashimoto, Masashi ; Fukuda, Yukio ; Ishibashi, Shigeki ; Kitayama, Ken-Ichi

Report Date : 22 MAY 1992

Pagination or Media Count : 4

Abstract : In a wide variety of optical parallel processings, spatial light modulators (SLMs), especially optically addressable SLMs (OASLMs), are versatile devices. SLMs have been used as an optical encoder and latch memory for optical computing and synaptic weighting mask for optical neural network. In this paper, accumulative thresholding (AT) characteristic, originated from the nonlinear transfer function, of newly developed GaAs/FLC-SLM that is a special class of OASLM structured with GaAs p-i-n diode and ferroelectric liquid crystal (FLC) is investigated. A monotonous sigmoid-like thresholding against optical energy of input pulses sequence is experimentally obtained. Furthermore, the application of the nonlinear characteristic of the SLM to both OR logic gate and latch memory is proposed.

Descriptors :   *OPTICAL PROCESSING, *PARALLEL PROCESSING, *THRESHOLD EFFECTS, *NONLINEAR OPTICS, LIGHT MODULATORS, TRANSFER FUNCTIONS, NEURAL NETS, ADDRESSING, GALLIUM ARSENIDES, LIQUID CRYSTALS.

Subject Categories : Electrooptical and Optoelectronic Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE