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Proceedings Paper

Laser Communication Data Relay From A Low-Earth Orbiting Satellite To A Geostationary Satellite
Author(s): Ramani Seshamani; D V.B Rao; T K Alex; Y K Jain
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Paper Abstract

Hemispherical data coverage for remote sensing satellites with a single ground station is opened up using a lightwave communication link. The paper presents the design of the semiconductor diode laser system for the low-earth-orbiting remote sensing satellite data relay through a geostationary satellite with data rates of 500 Mega bits per second. The laser type selected is the semiconductor GaAlAs diode laser operating at 810-840 nm. The detector type selected is an avalanche photodiode detector with direct detection. The optics design is described for the laser transmitter on the low-earth-orbiting satellite and on the geostationary satellite, along with the corresponding receivers. Consideration is given to the pointing, acquisition and tracking subsystem, as the tracking precision should be of the order of 0.3 urad. From bit-error-rate considerations, a CW laser power of 50 mW with direct detection using avalanche photodiodes is used for transmission, with a low-earth orbiting satellite transmitter optics diameter of 200 mm and a geostationary receiver optics diameter of 350 mm. A laser beacon operation is an integral part of the acquisition procedure to establish intra-orbit links.

Paper Details

Date Published: 11 July 1989
PDF: 8 pages
Proc. SPIE 1044, Optomechanical Design of Laser Transmitters and Receivers, (11 July 1989); doi: 10.1117/12.951291
Show Author Affiliations
Ramani Seshamani, ISRO Satellite Centre (India)
D V.B Rao, ISRO Satellite Centre (India)
T K Alex, ISRO Satellite Centre (India)
Y K Jain, ISRO Satellite Centre (India)

Published in SPIE Proceedings Vol. 1044:
Optomechanical Design of Laser Transmitters and Receivers
Bernard D. Seery, Editor(s)

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