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Proceedings Paper

Optically Controlled Absorption Of InGaAsP Epitaxial Layers For Parallel Optical Data Processing And Dynamic Holographic Gratings
Author(s): Wolfgang Kowalsky; Henning Fouckhardt; Karl J. Ebeling
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Paper Abstract

We investigate all-optical transmission control of InGaAsP epilayers on InP substrates by optical generation of excess carriers. A modulation depth of more than 40% is achieved at the near-band-gap wavelength of λt = 1.3μm of the 2μm thick epilayer at a power of a few mW in the control beam of λc = 790nm wavelength. The maximum bit rate is limited by excess carrier lifetimes to ca. 100 Mbit/s. Several channels can be operated in parallel. At a distance of 25pm between adjacent spots crosstalk between channels is less than -202 dB. Considering the low power dissipation a density in the order of several 100 channels/mm can be processed in parallel making this device attractive for all-optical data processing. We have used the capabilities of spatial light modulation to demonstrate dynamic holographic beam deflection. A theoretical analysis of the optical transmission control based on dynamic band filling in parabolic bands and direct electronic transitions provides a good description of the experiments.

Paper Details

Date Published: 31 January 1989
PDF: 8 pages
Proc. SPIE 1018, Electro-Optic and Magneto-Optic Materials, (31 January 1989); doi: 10.1117/12.950002
Show Author Affiliations
Wolfgang Kowalsky, Technical University of Braunschweig (Federal Republic of Germany)
Henning Fouckhardt, Technical University of Braunschweig (Federal Republic of Germany)
Karl J. Ebeling, Technical University of Braunschweig (Federal Republic of Germany)


Published in SPIE Proceedings Vol. 1018:
Electro-Optic and Magneto-Optic Materials
Jean-Pierre Huignard, Editor(s)

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