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Proceedings Paper

Space-environment simulation studies by MeV proton irradiation of two new quantum-well-based fiber optic light sources
Author(s): Bruce D. Evans; Harold E. Hager; Barrie W. Hughlock
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Paper Abstract

Two classes of quantum-well-based fiber-optic light sources were evaluated for degradation under 5.5-MeV proton irradiation as part of an evaluation of the survivability of fiber optic components for satellite applications. The first was an InGaAs/GaAs strained-layer quantum- well laser; the second was a broad-band light-emitting diode based on concurrent multiple- state transitions from two asymmetric quantum wells in the GaAs/AlGaAs system. In contrast to earlier reports comparing bulk active-region heterostructure light-emitting diodes with similar structured laser didoes, it was found here that these quantum-well light-emitting diodes are more tolerant of proton irradiation than the quantum-well-based lasers. Analysis revealed the quantum-well light-emitting diode allows operation far into gain saturation with the more lossy cavity structure as compared to quantum-well lasers. The lasers, in contrast, operate in a region where gain is more sensitive to current density, and therefore, the introduction of energetic proton-induced atomic displacement-related recombination sites have a greater effect than in similar structured light-emitting-diodes. In addition, it was found that the laser maintained constant slope efficiency, while current thresholds increased linearly with proton fluence. In contrast, both light-emitting-diode output-power and slope efficiency decreased with fluence. Experimental damage constants were determined for performance parameters and found to be similar to those previously reported for carrier removal rates on other GaAs- based electronic structures.

Paper Details

Date Published: 15 September 1993
PDF: 12 pages
Proc. SPIE 1953, Photonics for Space Environments, (15 September 1993); doi: 10.1117/12.156565
Show Author Affiliations
Bruce D. Evans, Boeing Defense & Space Group (United States)
Harold E. Hager, Boeing Defense & Space Group (United States)
Barrie W. Hughlock, Boeing Defense & Space Group (United States)

Published in SPIE Proceedings Vol. 1953:
Photonics for Space Environments
Edward W. Taylor, Editor(s)

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