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Proceedings Paper

Atmospheric turbulence effects on the performance of multigigabit downlink PPM laser communications
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Paper Abstract

Atmospheric turbulence effects on multigigabit/s data rate, pulse-position modulation (PPM) laser downlinks are examined for M = 4 or less using laser transmitter power of 100 mW to 1 W. From the impulse response curves, it is shown that the pulse spreading can be about 5 ps for strong turbulence and about 0.05 ps for weak turbulence. Thus in clear air turbulence without clouds and fog, the contribution from the stretching of a short pulse of 50 ps width will be negligible in both strong and weak turbulence. The high-data rate communication system performance is analyzed in terms of a BER using a thermalized equation derived here. It is concluded that, for the weak turbulence case, the required laser transmitter power to achieve a BER of 10 to the -8th is about 700 mW of power. For the strong turbulence case, a peak laser transmitter power of 1 kW is required to achieve a BER of 10 to the -5th.

Paper Details

Date Published: 1 July 1990
PDF: 17 pages
Proc. SPIE 1218, Free-Space Laser Communication Technologies II, (1 July 1990); doi: 10.1117/12.18217
Show Author Affiliations
Arun K. Majumdar, Univ. of Colorado/Denver (United States)
William C. Brown, Martin Marietta Astronautics Group (United States)


Published in SPIE Proceedings Vol. 1218:
Free-Space Laser Communication Technologies II
David L. Begley; Bernard D. Seery, Editor(s)

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