Dr. John F. Walkup Profile

Dr. John F. Walkup

Emeritus Professor of ECE; Texas Tech University at Texas Tech Univ

SPIE Involvement:

Author

Area of Expertise:

optical information processing/computing , statistical optics , digital image processing , information theory , statistical communication theory , holographic data storage

Publications (17)

Proceedings Article | 5 November 1998 Paper

Paper

Holographic multiplexing in multilayer recording medium

Arkady Bablumian, Thomas Krile, David Mehrl, John Walkup

Proceedings Volume 3468, (1998) https://doi.org/10.1117/12.330421

KEYWORDS: Holograms, 3D image reconstruction, Spherical lenses, Multiplexing, Holography, Waveguides, Multilayers, Diffraction, Optical storage, Waveguide modes

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Proceedings Article | 5 November 1998 Paper

Paper

Bit error rates for a photon echo memory

Jin Choi, John Walkup, Thomas Krile, David Mehrl

Proceedings Volume 3468, (1998) https://doi.org/10.1117/12.330424

KEYWORDS: Chemical species, Error analysis, Fourier transforms, Interference (communication), Amplifiers, Signal detection, Receivers, Optical amplifiers, Signal processing, Data storage

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Proceedings Article | 25 August 1998 Paper

Paper

Noise characterization of a liquid crystal light valve using a multiple-port Volterra series model

Mark Storrs, David Mehrl, John Walkup, Thomas Krile

Proceedings Volume 3388, (1998) https://doi.org/10.1117/12.319412

KEYWORDS: Signal to noise ratio, Modulation, Liquid crystals, Systems modeling, Complex systems, Light valves, Instrument modeling, Mathematical modeling, Amplifiers, Dielectric polarization

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Proceedings Article | 24 October 1997 Paper

Paper

Recording shift-selective volume holograms in bacteriorhodopsin

Arkady Bablumian, Thomas Krile, David Mehrl, John Walkup

Proceedings Volume 3159, (1997) https://doi.org/10.1117/12.284204

KEYWORDS: Holograms, Diffraction, Volume holography, Signal processing, Optical correlators, 3D image reconstruction, Transparency, Spherical lenses, Spatial light modulators, Multiplexing

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Proceedings Article | 24 October 1997 Paper

Paper

Multilevel holographic counterfeit protection

Arkady Bablumian, David Mehrl, John Walkup

Proceedings Volume 3159, (1997) https://doi.org/10.1117/12.284201

KEYWORDS: Holograms, 3D image reconstruction, Holography, Sensors, Diffraction, Information security, Visualization, Liquids, Waveguides, Diffraction gratings

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Proceedings Article | 1 November 1996 Paper

Paper

Multiport model of a liquid crystal light valve

Mark Storrs, David Mehrl, John Walkup

Proceedings Volume 2848, (1996) https://doi.org/10.1117/12.256142

KEYWORDS: Modulation, Spectrum analysis, Systems modeling, Liquid crystals, Optical amplifiers, Light valves, Signal processing, Amplifiers, Beam splitters, Optical components

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Proceedings Article | 12 June 1996 Paper

Paper

Holographic data storage in bacteriorhodopsin using phase-encoded multiplexing and spectrum spreading techniques

Jin Choi, John Walkup, Thomas Krile, David Mehrl

Proceedings Volume 2754, (1996) https://doi.org/10.1117/12.243140

KEYWORDS: Multiplexing, Data storage, Holography, Holograms, Binary data, Fourier transforms, Optical storage, Computer programming, Image restoration, Quantum efficiency

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Proceedings Article | 12 June 1996 Paper

Paper

Application of multiple-error-correcting binary BCH codes to optical matrix-vector multipliers

A. Tankut Caglar, Thomas Krile, John Walkup

Proceedings Volume 2754, (1996) https://doi.org/10.1117/12.243138

KEYWORDS: Binary data, Computer programming, Interference (communication), Computer simulations, Linear algebra, Forward error correction, Actinium, Error analysis, Reliability, Optical matrix switches

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Proceedings Article | 29 September 1994 Paper

Paper

Concept of precision in analog-based discrete numeric optical processors

Michael Morelli, Thomas Krile, John Walkup

Proceedings Volume 2297, (1994) https://doi.org/10.1117/12.187288

KEYWORDS: Signal processing, Analog electronics, Electro optics, Space operations, Electronics, Chemical elements, Dispersion, Data processing, Optical signal processing, Computing systems

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Proceedings Article | 14 September 1994 Paper

Paper

Complex-amplitude noise characteristics of analog liquid crystal spatial light modulators

Michael Morelli, Thomas Krile, John Walkup

Proceedings Volume 2265, (1994) https://doi.org/10.1117/12.186663

KEYWORDS: Polarization, Signal to noise ratio, Liquid crystals, Interference (communication), Modulators, Polarimetry, Analog electronics, Electro optical modeling, Beam splitters, Calibration

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Proceedings Article | 9 November 1993 Paper

Paper

Reduction of error effects in digital partitioning by error-correction coding

Scott Ellett, Thomas Krile, John Walkup

Proceedings Volume 2026, (1993) https://doi.org/10.1117/12.163580

KEYWORDS: Signal to noise ratio, Analog electronics, Computer programming, Forward error correction, Sensors, Computer simulations, Interference (communication), Quantization, Matrices, Binary data

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Proceedings Article | 9 November 1993 Paper

Paper

Statistical analysis and modeling of analog optical processors

Dogan Timucin, John Walkup, Thomas Krile

Proceedings Volume 2026, (1993) https://doi.org/10.1117/12.163574

KEYWORDS: Signal processing, Sensors, Statistical analysis, Statistical modeling, Spatial light modulators, Analog electronics, Instrument modeling, Photodetectors, Interference (communication), Stochastic processes

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SPIE Journal Paper | 1 November 1992

Optical logic function implementation using a one-dimensional deformable mirror device

Mohammed Hoq, Thomas Krile, John Walkup

OE, Vol. 31, Issue 11, (November 1992) https://doi.org/10.1117/12.10.1117/12.59948

KEYWORDS: Digital micromirror devices, Logic, Spatial light modulators, Mirrors, Deformable mirrors, Signal processing, Optical logic, Image processing, Multiplexing, Magneto-optics

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SPIE Journal Paper | 1 May 1992

BaTiO₃-based optical quadratic neural network implementing the perceptron algorithm

Alex Huynh, John Walkup, Thomas Krile

OE, Vol. 31, Issue 05, (May 1992) https://doi.org/10.1117/12.10.1117/12.56163

KEYWORDS: Neural networks, Ferroelectric materials, Crystals, Neurons, Multiplexing, Four wave mixing, Laser crystals, Evolutionary algorithms, Detection and tracking algorithms, Matrices

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Proceedings Article | 1 November 1991 Paper

Paper

Error codes applied to optical algebraic processors

Scott Ellett, John Walkup, Thomas Krile

Proceedings Volume 1564, (1991) https://doi.org/10.1117/12.49747

KEYWORDS: Forward error correction, Binary data, Interference (communication), Computer programming, Error control coding, Computer simulations, Optical signal processing, Signal detection, Error analysis, Data storage

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SPIE Journal Paper | 1 October 1991

Optical implementations of the alternating projection neural network

Alan Smith, John Walkup

OE, Vol. 30, Issue 10, (October 1991) https://doi.org/10.1117/12.10.1117/12.55972

KEYWORDS: Light emitting diodes, Spatial resolution, Neurons, Modulation, Neural networks, Sensors, Electro optics, Detector arrays, Photography, Electro optical modeling

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Proceedings Article | 1 July 1990 Paper

Paper

Bounds on achievable accuracy in analog optical linear-algebra processors

Stephen Batsell, John Walkup, Thomas Krile

Proceedings Volume 1319, (1990) https://doi.org/10.1117/12.22257

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Showing 5 of 17 publications

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