Semiconductor laser based optical intersatellite links are attractive for use in both DRS type applications, and as links in the existing satellite-based telecommunications networks (for example between EUTELSAT SMS and INTELSAT IBS business services satellites). Initial ISL experiments will demonstrate direct detection systems using intensity modulation. Coherent systems offer significant improvements over these: the use of frequency shift keying modulation and heterodyne receivers provide significantly improved system sensitivities, which will allow practical systems with reliable laser sources (50 mW CW), and small optical telescopes (20 cm diameter). The SILEX ADD-ON CHANNEL is intended to demonstrate the potential of such systems within the framework of the ESA SILEX program.

Date Published: 1 April 1990
PDF: 9 pages
Proc. SPIE 1191, Optical Systems for Space and Defence, (1 April 1990); doi: 10.1117/12.969705

Published in SPIE Proceedings Vol. 1191:
Optical Systems for Space and Defence
Alan H. Lettington, Editor(s)