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Please use this identifier to cite or link to this item: http://eprint.iitd.ac.in/handle/2074/226

Title: Photorefractive half-adder: beam-fanning for optical generation of ‘SUM’ and ‘CARRY’
Authors: Kamra, Kanwal
Singh, K
Keywords: Optical implementation
beam-fanning
photorefractive
multi-wavelength
illumination
binary
Issue Date: 1996
Citation: Optics Communications, 130(4-6), 393-401
Abstract: Optical implementation of an adder of arithmetic units that processes binary numbers is outlined. Dynamic range compression using biasing illumination in beam-fanning geometry as observed in a photorefractive BaTiO,:Fe crystal forms the underlying principle of operation. By proper choice of polarization for two input signals, XOR and AND operations are realized. These two operations are essentially analogous to SUM and CARRY generation for binary addition. By providing shift (only in case of CARRY) and feedback, experimental results for half-adder are obtained. In addition, the technique forms a very simple way of implementing ‘original carries’ as required for full-adder. The geometry proposed is simple, energy-efficient and can be easily extended to multi-wavelength operations thus achieving spectral parallelism in optical domain.
URI: http://eprint.iitd.ac.in/dspace/handle/2074/226
Appears in Collections:Physics

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