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Proceedings Paper

Power Penalty For Optical Free-Space Data Links Due To Background Illumination
Author(s): Walter R. Leeb
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Paper Abstract

In free-space optical data transmission systems illumination of the receive antenna by background radiation will decrease the signal-to-noise ratio. We derive expressions for that degradation both for direct and for heterodyne/homodyne receivers. Examples are given for the case that the Sun, the Moon, the Earth, and Venus illuminate earth-orbiting receivers operating at wavelengths of 0.85μm, 1.3μm, and 10.6 μm. Direct detection receivers will typically suffer a degradation between 5 and 15dB at λ=0.85p.m and λ=1.3pm when hit by the Sun. Heterodyne/homodyne receivers at 10.6 μm degrade stronger with Sun radiation (typically 4dB) than at the smaller wavelengths (z0.3dB). Moon, Earth, and Venus cause negligible reduction of signal-to-noise ratio.

Paper Details

Date Published: 2 May 1988
PDF: 8 pages
Proc. SPIE 0885, Free-Space Laser Communication Technologies, (2 May 1988); doi: 10.1117/12.976553
Show Author Affiliations
Walter R. Leeb, Technische Universitat Wien (Austria)

Published in SPIE Proceedings Vol. 0885:
Free-Space Laser Communication Technologies
David L. Begley; Gerhard A. Koepf, Editor(s)

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