Physics
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jbis...32..203r&link_type=abstract
British Interplanetary Society, Journal (Interstellar Studies), vol. 32, June 1979, p. 203-208.
Physics
Extraterrestrial Communication, Optical Communication, Pulsed Lasers, Signal Detection, High Resolution, Optical Heterodyning, Picosecond Pulses, Pulse Time Modulation, Radio Frequencies, Reflectors, Signal Reception, Signal Transmission, Stellar Luminosity
Scientific paper
Communications at optical frequencies from extraterrestrial sources many light years away are shown to be quite feasible and can be received using present receiver technology. It is explained that the exact optical frequency need not be known and that short pulses in the nanosecond regime at high energy per pulse at very low duty cycle are most likely to be sent. Large optical collectors (10 to 20 meters diameter) of non-image quality can be built at low cost to collect the signal. It is explained why present optical telescopes and instrumentation would not normally detect such signals due to the planet's starlight and how this can be overcome by optical communication modulation formats. These formats enable a number of bits of information per received pulse. With many bits/pulse transmitted, each pulse may represent a line-word allowing for a small number of pulses to transmit a crude picture. It is further explained how high resolution pictures may be obtained. A suggestion is made relating to possible optical frequencies but it is made clear that it is not essential to detection of extraterrestrial laser signals. It is suggested that laser signals should be given consideration in addition to radio frequency signals for extraterrestrial communications.
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