Computer Science – Performance
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1218..568m&link_type=abstract
IN: Free-space laser communication technologies II; Proceedings of the Meeting, Los Angeles, CA, Jan. 15-17, 1990 (A91-22776 08-
Computer Science
Performance
1
Atmospheric Turbulence, Optical Communication, Pulse Position Modulation, Bit Error Rate, Data Transmission, Downlinking
Scientific paper
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.
Brown William C.
Majumdar Arun K.
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