Optical Communication in Space A Challenge to Microwave Links

Abstract

Laser communications offer a viable alternative to microwave communications for intersatellite and interplanetary links. Main characteristics are higher data rates, small size antenna telescopes with narrow beamwidths, but the drawback of the necessity for complex pointing, acquisition and tracking systems. After a review of some important technology aspects and modulation / detection schemes the optospecific link parameters axe discussed. An experimental coherent optical system set-up at DLR is described.