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Proceedings Paper

Significance of chirp parameter for direct-detection free-space laser communication
Author(s): Martin M. Strasser; Peter J. Winzer; Martin Pfennigbauer; Walter R. Leeb
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Paper Abstract

We investigate the influence of chirp on free-space laser communication systems employing optically preamplified direct-detection receivers. We analyze the changes of receiver sensitivities in the presence of chirp and optimize both the optical and electrical receiver bandwidth with regard to sensitivity. For return-to-zero (RZ) coding with 33% duty cycle the receiver sensitivity decreases due to spectral broadening of the received signal by typically 3 dB when the chirp parameter amounts to alphaequals5. For optimized bandwidths, the penalty can be kept as low as 1 dB. In contrast, in the case of non-return-to-zero coding, chirp can reduce inter-symbol interference (ISI), thus improving receiver performance due to a pulse compression effect. The gain in sensitivity can be as large as to 1.8 dB when the magnitude of the chirp is alphaequals4. A larger chirp decreases the receiver sensitivity. In the case of NRZ, the optimum receiver bandwidths are quite insensitive with regard to chirp.

Paper Details

Date Published: 20 June 2001
PDF: 8 pages
Proc. SPIE 4272, Free-Space Laser Communication Technologies XIII, (20 June 2001); doi: 10.1117/12.430784
Show Author Affiliations
Martin M. Strasser, Technische Univ. Wien (Austria)
Peter J. Winzer, Technische Univ. Wien (United States)
Martin Pfennigbauer, Technische Univ. Wien (Austria)
Walter R. Leeb, Technische Univ. Wien (Austria)

Published in SPIE Proceedings Vol. 4272:
Free-Space Laser Communication Technologies XIII
G. Stephen Mecherle, Editor(s)

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