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Hard Limiting Opto-electronic Logic Devices

  • P. Wheatley
  • M. Whitehead
  • P. J. Bradley
  • G. Parry
  • J. E. Midwinter
  • P. Mistry
  • M. A. Pate
  • J. S. Roberts
Part of the Springer Series in Electronics and Photonics book series (SSEP, volume 25)

Abstract

We report the demonstration of two novel opto-electronic devices whose characteristics appear to make them suitable for optical logic. One of the devices may be developed into a NOR or NAND gate and the other into an OR or AND gate. The devices are based on the use of electronic gain together with optical input and output and the specific implementation uses a photo-transistor to provide photo-detection and gain and a GaAs/AlGaAs multiple-quantum-well (MQW) electro-absorption modulator [1] to enable optical output. The components are connected in such a way as to provide a characteristic suitable for logic [2]: the output is hard-limited, the input is isolated from the output and the switching time is potentially fast, Electronic nonlinearities are strong, giving the potential for low power switching, and are fundamentally fast and optical access has the potential of high data rate communication with low crosstalk.

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References

  1. 1.
    Wood, T.H., et al, Appl.Phys.Lett. 44, 16 (1984)ADSCrossRefGoogle Scholar
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    Keyes, R.V., Optica Acta 32, 525 (1985)ADSCrossRefGoogle Scholar
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    Wheatley, P. et al, Electron. Lett. 23, 92 (1987)CrossRefGoogle Scholar
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    Miller, D.A.B et al, Optics Lett. 9, 567 (1984)ADSCrossRefGoogle Scholar
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    Bradley, P.J. et al, Electron. Lett. 23, 213 (1987)MathSciNetADSCrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1988

Authors and Affiliations

  • P. Wheatley
    • 1
  • M. Whitehead
    • 1
  • P. J. Bradley
    • 1
  • G. Parry
    • 1
  • J. E. Midwinter
    • 1
  • P. Mistry
    • 2
  • M. A. Pate
    • 2
  • J. S. Roberts
    • 2
  1. 1.Dept. of Electronic and Electrical EngineeringUniversity College LondonLondonUK
  2. 2.SERC Central Facility for III-V SemiconductorsUniversity of SheffieldSheffieldUK

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