CO2 laser communication systems for near-earth space applications

Details CO2 laser communication systems for near-earth space applications CO2 laser communication systems for near-earth space applications

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ieeep..65..221m&link_type=abstract

IEEE, Proceedings, vol. 65, Feb. 1977, p. 221-251.

Computer Science

4

Carbon Dioxide Lasers, Data Transmission, Optical Communication, Optical Heterodyning, Space Communication, Synchronous Satellites, Bibliographies, Block Diagrams, Doppler Effect, Error Analysis, Infrared Lasers, Phase Shift, Transmitter Receivers

Scientific paper

Projections of the growth of earth-sensing systems for the latter half of the 1980's show a data-transmission requirement of 300 Mbit/s and above. The most efficient technique to return the data from a sensing satellite to a ground station is through a geosynchronous data relay satellite. A laser system is most attractive for the space-to-space link. A five-year program was conducted which has shown the basic technical feasibility of accomplishing this link with a CO2 laser system operating at a wavelength near 10 microns. The system uses a mercury-cadmium-telluride infrared mixer cooled to approximately 100 K by a radiative cooler. The laser local oscillator and coupling-modulated laser transmitter use conductively cooled beryllium oxide construction. The optical antenna for transmission and reception has a gain of nominally 92 dB with a 3-dB beamwidth of 80 microrad. Tracking jitter is less than ten microrad, and signal acquisition occurs in less than 1 min. The receiver subsystem has a sensitivity of 10 to the -19th power W/Hz, accommodates a 300-Mbit/s data rate, and can track Doppler frequency variations over a + or - 700-MHz range.

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