Abstract Space telecom scenarios like data relay satellite and broadband/broadcast service providers require reliable feeder links with high bandwidth/data rate for the communication between ground station and satellite. Free space optical communication (FSOC) is an attractive alternative to microwave links, improving performance by offering abundant bandwidth at small apertures of the optical terminals. At the same time Near-Earth communication by FSOC avoids interference with other services and is free of regulatory issues. The drawback however is the impairment by the laser propagation through the atmosphere at optical wavelengths. Also to be considered are questions of eye safety for ground personnel and aviation. In this paper we assess the user requirements for typical space telecom scenarios and compare these requirements with solutions using optical data links through the atmosphere. We suggest a site diversity scheme with a number of ground stations and a switching scheme using two optical terminals on-board the satellite. Considering the technology trade-offs between four different optical wavelengths we recommend the future use of 1.5µm laser technology and calculate a link budget for an atmospheric condition of light haze on the optical path. By comparing link budgets we show an outlook to the future potential use of 10µm laser technology.
Highlights • • Space telecomm scenarios investigated: Data Relay Satellite Applications, Broadcast/Broadband Service Providers. • Site diversity: Mediterranean area/Canary Islands. • Link diversity: Switching scheme with 2 on-board terminals. • Primary and secondary wavelength recommendation: 1550nm/10µm.
Feasibility assessment of optical technologies for reliable high capacity feeder links
Acta Astronautica ; 89 ; 254-260
2013-04-07
7 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Feasibility assessment of optical technologies for reliable high capacity feeder links
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