Accession Number : AD0287640

Title :   INVESTIGATION OF OPTICAL SPECTRAL REGIONS FOR SPACE COMMUNICATIONS

Corporate Author : MICHIGAN UNIV ANN ARBOR INST OF SCIENCE AND TECHNOLOGY

Personal Author(s) : ROLLIN,RUSSELL A.

Report Date : NOV 1962

Pagination or Media Count : 1

Abstract : An analysis is presented of space-communications systems in the optical spectrum (wavelength of 0.2 to 100 microns). Background interference expected during various space missions was also investigated, and a literature search on transmitter and receiver components was carried out. The systems studies included derivation of the general optical systems range equation and equations for the maximum theoretical range of optical communications and the maximum theoretical channel capacity. The general range-bandwidth equation was extended into two special range equations (one for photocathode-type and one for photoconductive type quantum detectors). The background-interference work included studies of irradeance vs. wavelength of some of the planets and brighter stars. The equation of the probability of seeing a star of a given magnitude or greater was derived. Also studied was the literature on optical-transmitter modulators and modulation techniques and on optical-system lenses and reflector-aperture characteristics. Analysis and configurations for beaming an extended source are described. The blackbody temperature of a reflector in the space environment at its maximum was investigated. (Author)

Descriptors :   (*LIGHT COMMUNICATION SYSTEMS), BLACKBODY RADIATION, INFRARED DETECTORS, INFRARED PHOTOCONDUCTORS, INTERFERENCE, LASERS, LENSES, MODULATORS, OPTICAL EQUIPMENT, PLANETS, SIGNAL-TO-NOISE RATIO, SOURCES, SPACE COMMUNICATIONS, STARS, SUN, OPTICAL EQUIPMENT, SPACE FLIGHT

Distribution Statement : APPROVED FOR PUBLIC RELEASE