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Proceedings Paper

The Lunar Laser OCTL Terminal (LLOT) optical systems
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Paper Abstract

The Lunar Laser OCTL Terminal is an auxiliary ground station terminal for the Lunar Laser Communication Demonstration (LLCD). The LLOT optical systems exercise modulation and beam divergence control over six 10-W fiber-based laser transmitters at 1568 nm, which act as beacons for pointing of the space-based terminal. The LLOT design transmits these beams from distinct sub-apertures of the F/76 OCTL telescope at divergences ranging from 110 μrad to 40 μrad. LLOT also uses the same telescope aperture to receive the downlink signal at 1550 nm from the spacecraft terminal. Characteristics and control of the beacon lasers, methods of establishing and maintaining beam alignment, beam zoom system design, co-registration of the transmitted beams and the receive field of view, transmit/receive isolation, and downlink signal manipulation and control are discussed.

Paper Details

Date Published: 22 March 2013
PDF: 9 pages
Proc. SPIE 8610, Free-Space Laser Communication and Atmospheric Propagation XXV, 86100P (22 March 2013); doi: 10.1117/12.2004415
Show Author Affiliations
W. Thomas Roberts, Jet Propulsion Lab. (United States)
Malcolm W. Wright, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 8610:
Free-Space Laser Communication and Atmospheric Propagation XXV
Hamid Hemmati; Don M. Boroson, Editor(s)

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