Abstract
Six optical technologies are evaluated for use in a full-duplex telecommunications link between geostationary INTELSAT satellites. The six technologies are based upon the carbon dioxide gas laser, the neodymium-doped yttrium aluminum garnet (Nd:YAG) solid-state laser, the indium gallium arsenide phosphide (InGaAsP) semiconductor diode laser, and the gallium aluminum arsenide (GaAlAs) semiconductor diode laser (three systems). The salient features of the various technologies are described, and their communications performances are analyzed to determine antenna diameter requirements for various modulation formats. The GaAlAs systems, with their small size, high electrical-to-optical conversion efficiency, direct modulation capability, wave-length selectability, and high reliability are found to be promising technologies for the full-duplex geostationary intersatellite link.
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